1891 lines
77 KiB
Java
1891 lines
77 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.io;
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import java.io.File;
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import java.io.FileFilter;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.List;
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import java.util.zip.CRC32;
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import java.util.zip.CheckedInputStream;
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import java.util.zip.Checksum;
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import org.apache.commons.io.filefilter.DirectoryFileFilter;
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import org.apache.commons.io.filefilter.FalseFileFilter;
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import org.apache.commons.io.filefilter.FileFilterUtils;
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import org.apache.commons.io.filefilter.IOFileFilter;
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import org.apache.commons.io.filefilter.SuffixFileFilter;
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import org.apache.commons.io.filefilter.TrueFileFilter;
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import org.apache.commons.io.output.NullOutputStream;
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/**
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* General file manipulation utilities.
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* <p>
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* Facilities are provided in the following areas:
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* <ul>
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* <li>writing to a file
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* <li>reading from a file
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* <li>make a directory including parent directories
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* <li>copying files and directories
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* <li>deleting files and directories
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* <li>converting to and from a URL
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* <li>listing files and directories by filter and extension
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* <li>comparing file content
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* <li>file last changed date
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* <li>calculating a checksum
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* </ul>
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* <p>
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* Origin of code: Excalibur, Alexandria, Commons-Utils
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*
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* @author <a href="mailto:burton@relativity.yi.org">Kevin A. Burton</A>
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* @author <a href="mailto:sanders@apache.org">Scott Sanders</a>
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* @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
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* @author <a href="mailto:Christoph.Reck@dlr.de">Christoph.Reck</a>
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* @author <a href="mailto:peter@apache.org">Peter Donald</a>
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* @author <a href="mailto:jefft@apache.org">Jeff Turner</a>
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* @author Matthew Hawthorne
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* @author <a href="mailto:jeremias@apache.org">Jeremias Maerki</a>
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* @author Stephen Colebourne
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* @author Ian Springer
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* @author Chris Eldredge
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* @author Jim Harrington
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* @author Niall Pemberton
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* @author Sandy McArthur
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* @version $Id: FileUtils.java 610810 2008-01-10 15:04:49Z niallp $
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*/
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public class FileUtils {
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/**
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* Instances should NOT be constructed in standard programming.
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*/
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public FileUtils() {
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super();
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}
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/**
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* The number of bytes in a kilobyte.
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*/
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public static final long ONE_KB = 1024;
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/**
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* The number of bytes in a megabyte.
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*/
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public static final long ONE_MB = ONE_KB * ONE_KB;
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/**
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* The number of bytes in a gigabyte.
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*/
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public static final long ONE_GB = ONE_KB * ONE_MB;
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/**
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* An empty array of type <code>File</code>.
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*/
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public static final File[] EMPTY_FILE_ARRAY = new File[0];
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//-----------------------------------------------------------------------
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/**
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* Opens a {@link FileInputStream} for the specified file, providing better
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* error messages than simply calling <code>new FileInputStream(file)</code>.
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* <p>
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* At the end of the method either the stream will be successfully opened,
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* or an exception will have been thrown.
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* <p>
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* An exception is thrown if the file does not exist.
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* An exception is thrown if the file object exists but is a directory.
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* An exception is thrown if the file exists but cannot be read.
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*
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* @param file the file to open for input, must not be <code>null</code>
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* @return a new {@link FileInputStream} for the specified file
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* @throws FileNotFoundException if the file does not exist
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* @throws IOException if the file object is a directory
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* @throws IOException if the file cannot be read
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* @since Commons IO 1.3
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*/
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public static FileInputStream openInputStream(File file) throws IOException {
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if (file.exists()) {
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if (file.isDirectory()) {
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throw new IOException("File '" + file + "' exists but is a directory");
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}
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if (file.canRead() == false) {
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throw new IOException("File '" + file + "' cannot be read");
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}
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} else {
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throw new FileNotFoundException("File '" + file + "' does not exist");
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}
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return new FileInputStream(file);
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}
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//-----------------------------------------------------------------------
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/**
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* Opens a {@link FileOutputStream} for the specified file, checking and
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* creating the parent directory if it does not exist.
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* <p>
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* At the end of the method either the stream will be successfully opened,
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* or an exception will have been thrown.
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* <p>
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* The parent directory will be created if it does not exist.
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* The file will be created if it does not exist.
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* An exception is thrown if the file object exists but is a directory.
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* An exception is thrown if the file exists but cannot be written to.
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* An exception is thrown if the parent directory cannot be created.
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*
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* @param file the file to open for output, must not be <code>null</code>
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* @return a new {@link FileOutputStream} for the specified file
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* @throws IOException if the file object is a directory
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* @throws IOException if the file cannot be written to
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* @throws IOException if a parent directory needs creating but that fails
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* @since Commons IO 1.3
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*/
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public static FileOutputStream openOutputStream(File file) throws IOException {
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if (file.exists()) {
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if (file.isDirectory()) {
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throw new IOException("File '" + file + "' exists but is a directory");
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}
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if (file.canWrite() == false) {
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throw new IOException("File '" + file + "' cannot be written to");
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}
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} else {
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File parent = file.getParentFile();
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if (parent != null && parent.exists() == false) {
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if (parent.mkdirs() == false) {
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throw new IOException("File '" + file + "' could not be created");
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}
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}
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}
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return new FileOutputStream(file);
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}
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//-----------------------------------------------------------------------
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/**
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* Returns a human-readable version of the file size, where the input
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* represents a specific number of bytes.
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*
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* @param size the number of bytes
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* @return a human-readable display value (includes units)
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*/
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public static String byteCountToDisplaySize(long size) {
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String displaySize;
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if (size / ONE_GB > 0) {
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displaySize = String.valueOf(size / ONE_GB) + " GB";
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} else if (size / ONE_MB > 0) {
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displaySize = String.valueOf(size / ONE_MB) + " MB";
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} else if (size / ONE_KB > 0) {
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displaySize = String.valueOf(size / ONE_KB) + " KB";
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} else {
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displaySize = String.valueOf(size) + " bytes";
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}
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return displaySize;
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}
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//-----------------------------------------------------------------------
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/**
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* Implements the same behaviour as the "touch" utility on Unix. It creates
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* a new file with size 0 or, if the file exists already, it is opened and
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* closed without modifying it, but updating the file date and time.
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* <p>
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* NOTE: As from v1.3, this method throws an IOException if the last
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* modified date of the file cannot be set. Also, as from v1.3 this method
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* creates parent directories if they do not exist.
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*
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* @param file the File to touch
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* @throws IOException If an I/O problem occurs
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*/
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public static void touch(File file) throws IOException {
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if (!file.exists()) {
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OutputStream out = openOutputStream(file);
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IOUtils.closeQuietly(out);
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}
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boolean success = file.setLastModified(System.currentTimeMillis());
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if (!success) {
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throw new IOException("Unable to set the last modification time for " + file);
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}
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}
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//-----------------------------------------------------------------------
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/**
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* Converts a Collection containing java.io.File instanced into array
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* representation. This is to account for the difference between
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* File.listFiles() and FileUtils.listFiles().
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*
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* @param files a Collection containing java.io.File instances
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* @return an array of java.io.File
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*/
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public static File[] convertFileCollectionToFileArray(Collection<File> files) {
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return files.toArray(new File[files.size()]);
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}
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//-----------------------------------------------------------------------
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/**
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* Finds files within a given directory (and optionally its
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* subdirectories). All files found are filtered by an IOFileFilter.
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*
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* @param files the collection of files found.
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* @param directory the directory to search in.
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* @param filter the filter to apply to files and directories.
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*/
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private static void innerListFiles(Collection<File> files, File directory,
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IOFileFilter filter) {
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File[] found = directory.listFiles((FileFilter) filter);
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if (found != null) {
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for (int i = 0; i < found.length; i++) {
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if (found[i].isDirectory()) {
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innerListFiles(files, found[i], filter);
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} else {
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files.add(found[i]);
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}
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}
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}
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}
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/**
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* Finds files within a given directory (and optionally its
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* subdirectories). All files found are filtered by an IOFileFilter.
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* <p>
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* If your search should recurse into subdirectories you can pass in
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* an IOFileFilter for directories. You don't need to bind a
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* DirectoryFileFilter (via logical AND) to this filter. This method does
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* that for you.
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* <p>
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* An example: If you want to search through all directories called
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* "temp" you pass in <code>FileFilterUtils.NameFileFilter("temp")</code>
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* <p>
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* Another common usage of this method is find files in a directory
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* tree but ignoring the directories generated CVS. You can simply pass
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* in <code>FileFilterUtils.makeCVSAware(null)</code>.
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*
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* @param directory the directory to search in
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* @param fileFilter filter to apply when finding files.
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* @param dirFilter optional filter to apply when finding subdirectories.
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* If this parameter is <code>null</code>, subdirectories will not be included in the
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* search. Use TrueFileFilter.INSTANCE to match all directories.
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* @return an collection of java.io.File with the matching files
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* @see org.apache.commons.io.filefilter.FileFilterUtils
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* @see org.apache.commons.io.filefilter.NameFileFilter
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*/
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public static Collection<File> listFiles(
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File directory, IOFileFilter fileFilter, IOFileFilter dirFilter) {
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if (!directory.isDirectory()) {
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throw new IllegalArgumentException(
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"Parameter 'directory' is not a directory");
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}
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if (fileFilter == null) {
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throw new NullPointerException("Parameter 'fileFilter' is null");
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}
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//Setup effective file filter
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IOFileFilter effFileFilter = FileFilterUtils.andFileFilter(fileFilter,
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FileFilterUtils.notFileFilter(DirectoryFileFilter.INSTANCE));
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//Setup effective directory filter
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IOFileFilter effDirFilter;
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if (dirFilter == null) {
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effDirFilter = FalseFileFilter.INSTANCE;
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} else {
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effDirFilter = FileFilterUtils.andFileFilter(dirFilter,
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DirectoryFileFilter.INSTANCE);
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}
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//Find files
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Collection<File> files = new java.util.LinkedList<File>();
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innerListFiles(files, directory,
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FileFilterUtils.orFileFilter(effFileFilter, effDirFilter));
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return files;
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}
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/**
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* Allows iteration over the files in given directory (and optionally
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* its subdirectories).
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* <p>
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* All files found are filtered by an IOFileFilter. This method is
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* based on {@link #listFiles(File, IOFileFilter, IOFileFilter)}.
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*
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* @param directory the directory to search in
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* @param fileFilter filter to apply when finding files.
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* @param dirFilter optional filter to apply when finding subdirectories.
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* If this parameter is <code>null</code>, subdirectories will not be included in the
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* search. Use TrueFileFilter.INSTANCE to match all directories.
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* @return an iterator of java.io.File for the matching files
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* @see org.apache.commons.io.filefilter.FileFilterUtils
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* @see org.apache.commons.io.filefilter.NameFileFilter
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* @since Commons IO 1.2
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*/
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public static Iterator<File> iterateFiles(
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File directory, IOFileFilter fileFilter, IOFileFilter dirFilter) {
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return listFiles(directory, fileFilter, dirFilter).iterator();
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}
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//-----------------------------------------------------------------------
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/**
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* Converts an array of file extensions to suffixes for use
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* with IOFileFilters.
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*
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* @param extensions an array of extensions. Format: {"java", "xml"}
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* @return an array of suffixes. Format: {".java", ".xml"}
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*/
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private static String[] toSuffixes(String[] extensions) {
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String[] suffixes = new String[extensions.length];
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for (int i = 0; i < extensions.length; i++) {
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suffixes[i] = "." + extensions[i];
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}
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return suffixes;
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}
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/**
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* Finds files within a given directory (and optionally its subdirectories)
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* which match an array of extensions.
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*
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* @param directory the directory to search in
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* @param extensions an array of extensions, ex. {"java","xml"}. If this
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* parameter is <code>null</code>, all files are returned.
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* @param recursive if true all subdirectories are searched as well
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* @return an collection of java.io.File with the matching files
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*/
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public static Collection<File> listFiles(
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File directory, String[] extensions, boolean recursive) {
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IOFileFilter filter;
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if (extensions == null) {
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filter = TrueFileFilter.INSTANCE;
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} else {
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String[] suffixes = toSuffixes(extensions);
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filter = new SuffixFileFilter(suffixes);
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}
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return listFiles(directory, filter,
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(recursive ? TrueFileFilter.INSTANCE : FalseFileFilter.INSTANCE));
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}
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/**
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* Allows iteration over the files in a given directory (and optionally
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* its subdirectories) which match an array of extensions. This method
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* is based on {@link #listFiles(File, String[], boolean)}.
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*
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* @param directory the directory to search in
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* @param extensions an array of extensions, ex. {"java","xml"}. If this
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* parameter is <code>null</code>, all files are returned.
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* @param recursive if true all subdirectories are searched as well
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* @return an iterator of java.io.File with the matching files
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* @since Commons IO 1.2
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*/
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public static Iterator<File> iterateFiles(
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File directory, String[] extensions, boolean recursive) {
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return listFiles(directory, extensions, recursive).iterator();
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}
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//-----------------------------------------------------------------------
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/**
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* Compares the contents of two files to determine if they are equal or not.
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* <p>
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* This method checks to see if the two files are different lengths
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* or if they point to the same file, before resorting to byte-by-byte
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* comparison of the contents.
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* <p>
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* Code origin: Avalon
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*
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* @param file1 the first file
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* @param file2 the second file
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* @return true if the content of the files are equal or they both don't
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* exist, false otherwise
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* @throws IOException in case of an I/O error
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*/
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public static boolean contentEquals(File file1, File file2) throws IOException {
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boolean file1Exists = file1.exists();
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if (file1Exists != file2.exists()) {
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return false;
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}
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if (!file1Exists) {
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// two not existing files are equal
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return true;
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}
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if (file1.isDirectory() || file2.isDirectory()) {
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// don't want to compare directory contents
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throw new IOException("Can't compare directories, only files");
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}
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if (file1.length() != file2.length()) {
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// lengths differ, cannot be equal
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return false;
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}
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if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
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// same file
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return true;
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}
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InputStream input1 = null;
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InputStream input2 = null;
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try {
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input1 = new FileInputStream(file1);
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input2 = new FileInputStream(file2);
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return IOUtils.contentEquals(input1, input2);
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} finally {
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IOUtils.closeQuietly(input1);
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IOUtils.closeQuietly(input2);
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}
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}
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//-----------------------------------------------------------------------
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/**
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* Convert from a <code>URL</code> to a <code>File</code>.
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* <p>
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* From version 1.1 this method will decode the URL.
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* Syntax such as <code>file:///my%20docs/file.txt</code> will be
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* correctly decoded to <code>/my docs/file.txt</code>.
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*
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* @param url the file URL to convert, <code>null</code> returns <code>null</code>
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* @return the equivalent <code>File</code> object, or <code>null</code>
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* if the URL's protocol is not <code>file</code>
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* @throws IllegalArgumentException if the file is incorrectly encoded
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*/
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public static File toFile(URL url) {
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if (url == null || !url.getProtocol().equals("file")) {
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return null;
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} else {
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String filename = url.getFile().replace('/', File.separatorChar);
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int pos =0;
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while ((pos = filename.indexOf('%', pos)) >= 0) {
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if (pos + 2 < filename.length()) {
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String hexStr = filename.substring(pos + 1, pos + 3);
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char ch = (char) Integer.parseInt(hexStr, 16);
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filename = filename.substring(0, pos) + ch + filename.substring(pos + 3);
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}
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}
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return new File(filename);
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}
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}
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|
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/**
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* Converts each of an array of <code>URL</code> to a <code>File</code>.
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* <p>
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* Returns an array of the same size as the input.
|
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* If the input is <code>null</code>, an empty array is returned.
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* If the input contains <code>null</code>, the output array contains <code>null</code> at the same
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* index.
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* <p>
|
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* This method will decode the URL.
|
|
* Syntax such as <code>file:///my%20docs/file.txt</code> will be
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* correctly decoded to <code>/my docs/file.txt</code>.
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*
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* @param urls the file URLs to convert, <code>null</code> returns empty array
|
|
* @return a non-<code>null</code> array of Files matching the input, with a <code>null</code> item
|
|
* if there was a <code>null</code> at that index in the input array
|
|
* @throws IllegalArgumentException if any file is not a URL file
|
|
* @throws IllegalArgumentException if any file is incorrectly encoded
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static File[] toFiles(URL[] urls) {
|
|
if (urls == null || urls.length == 0) {
|
|
return EMPTY_FILE_ARRAY;
|
|
}
|
|
File[] files = new File[urls.length];
|
|
for (int i = 0; i < urls.length; i++) {
|
|
URL url = urls[i];
|
|
if (url != null) {
|
|
if (url.getProtocol().equals("file") == false) {
|
|
throw new IllegalArgumentException(
|
|
"URL could not be converted to a File: " + url);
|
|
}
|
|
files[i] = toFile(url);
|
|
}
|
|
}
|
|
return files;
|
|
}
|
|
|
|
/**
|
|
* Converts each of an array of <code>File</code> to a <code>URL</code>.
|
|
* <p>
|
|
* Returns an array of the same size as the input.
|
|
*
|
|
* @param files the files to convert
|
|
* @return an array of URLs matching the input
|
|
* @throws IOException if a file cannot be converted
|
|
*/
|
|
public static URL[] toURLs(File[] files) throws IOException {
|
|
URL[] urls = new URL[files.length];
|
|
|
|
for (int i = 0; i < urls.length; i++) {
|
|
urls[i] = files[i].toURI().toURL();
|
|
}
|
|
|
|
return urls;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Copies a file to a directory preserving the file date.
|
|
* <p>
|
|
* This method copies the contents of the specified source file
|
|
* to a file of the same name in the specified destination directory.
|
|
* The destination directory is created if it does not exist.
|
|
* If the destination file exists, then this method will overwrite it.
|
|
*
|
|
* @param srcFile an existing file to copy, must not be <code>null</code>
|
|
* @param destDir the directory to place the copy in, must not be <code>null</code>
|
|
*
|
|
* @throws NullPointerException if source or destination is null
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @see #copyFile(File, File, boolean)
|
|
*/
|
|
public static void copyFileToDirectory(File srcFile, File destDir) throws IOException {
|
|
copyFileToDirectory(srcFile, destDir, true);
|
|
}
|
|
|
|
/**
|
|
* Copies a file to a directory optionally preserving the file date.
|
|
* <p>
|
|
* This method copies the contents of the specified source file
|
|
* to a file of the same name in the specified destination directory.
|
|
* The destination directory is created if it does not exist.
|
|
* If the destination file exists, then this method will overwrite it.
|
|
*
|
|
* @param srcFile an existing file to copy, must not be <code>null</code>
|
|
* @param destDir the directory to place the copy in, must not be <code>null</code>
|
|
* @param preserveFileDate true if the file date of the copy
|
|
* should be the same as the original
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @see #copyFile(File, File, boolean)
|
|
* @since Commons IO 1.3
|
|
*/
|
|
public static void copyFileToDirectory(File srcFile, File destDir, boolean preserveFileDate) throws IOException {
|
|
if (destDir == null) {
|
|
throw new NullPointerException("Destination must not be null");
|
|
}
|
|
if (destDir.exists() && destDir.isDirectory() == false) {
|
|
throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory");
|
|
}
|
|
copyFile(srcFile, new File(destDir, srcFile.getName()), preserveFileDate);
|
|
}
|
|
|
|
/**
|
|
* Copies a file to a new location preserving the file date.
|
|
* <p>
|
|
* This method copies the contents of the specified source file to the
|
|
* specified destination file. The directory holding the destination file is
|
|
* created if it does not exist. If the destination file exists, then this
|
|
* method will overwrite it.
|
|
*
|
|
* @param srcFile an existing file to copy, must not be <code>null</code>
|
|
* @param destFile the new file, must not be <code>null</code>
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @see #copyFileToDirectory(File, File)
|
|
*/
|
|
public static void copyFile(File srcFile, File destFile) throws IOException {
|
|
copyFile(srcFile, destFile, true);
|
|
}
|
|
|
|
/**
|
|
* Copies a file to a new location.
|
|
* <p>
|
|
* This method copies the contents of the specified source file
|
|
* to the specified destination file.
|
|
* The directory holding the destination file is created if it does not exist.
|
|
* If the destination file exists, then this method will overwrite it.
|
|
*
|
|
* @param srcFile an existing file to copy, must not be <code>null</code>
|
|
* @param destFile the new file, must not be <code>null</code>
|
|
* @param preserveFileDate true if the file date of the copy
|
|
* should be the same as the original
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @see #copyFileToDirectory(File, File, boolean)
|
|
*/
|
|
public static void copyFile(File srcFile, File destFile,
|
|
boolean preserveFileDate) throws IOException {
|
|
if (srcFile == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (destFile == null) {
|
|
throw new NullPointerException("Destination must not be null");
|
|
}
|
|
if (srcFile.exists() == false) {
|
|
throw new FileNotFoundException("Source '" + srcFile + "' does not exist");
|
|
}
|
|
if (srcFile.isDirectory()) {
|
|
throw new IOException("Source '" + srcFile + "' exists but is a directory");
|
|
}
|
|
if (srcFile.getCanonicalPath().equals(destFile.getCanonicalPath())) {
|
|
throw new IOException("Source '" + srcFile + "' and destination '" + destFile + "' are the same");
|
|
}
|
|
if (destFile.getParentFile() != null && destFile.getParentFile().exists() == false) {
|
|
if (destFile.getParentFile().mkdirs() == false) {
|
|
throw new IOException("Destination '" + destFile + "' directory cannot be created");
|
|
}
|
|
}
|
|
if (destFile.exists() && destFile.canWrite() == false) {
|
|
throw new IOException("Destination '" + destFile + "' exists but is read-only");
|
|
}
|
|
doCopyFile(srcFile, destFile, preserveFileDate);
|
|
}
|
|
|
|
/**
|
|
* Internal copy file method.
|
|
*
|
|
* @param srcFile the validated source file, must not be <code>null</code>
|
|
* @param destFile the validated destination file, must not be <code>null</code>
|
|
* @param preserveFileDate whether to preserve the file date
|
|
* @throws IOException if an error occurs
|
|
*/
|
|
private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
|
|
if (destFile.exists() && destFile.isDirectory()) {
|
|
throw new IOException("Destination '" + destFile + "' exists but is a directory");
|
|
}
|
|
|
|
FileInputStream input = new FileInputStream(srcFile);
|
|
try {
|
|
FileOutputStream output = new FileOutputStream(destFile);
|
|
try {
|
|
IOUtils.copy(input, output);
|
|
} finally {
|
|
IOUtils.closeQuietly(output);
|
|
}
|
|
} finally {
|
|
IOUtils.closeQuietly(input);
|
|
}
|
|
|
|
if (srcFile.length() != destFile.length()) {
|
|
throw new IOException("Failed to copy full contents from '" +
|
|
srcFile + "' to '" + destFile + "'");
|
|
}
|
|
if (preserveFileDate) {
|
|
destFile.setLastModified(srcFile.lastModified());
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Copies a directory to within another directory preserving the file dates.
|
|
* <p>
|
|
* This method copies the source directory and all its contents to a
|
|
* directory of the same name in the specified destination directory.
|
|
* <p>
|
|
* The destination directory is created if it does not exist.
|
|
* If the destination directory did exist, then this method merges
|
|
* the source with the destination, with the source taking precedence.
|
|
*
|
|
* @param srcDir an existing directory to copy, must not be <code>null</code>
|
|
* @param destDir the directory to place the copy in, must not be <code>null</code>
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @since Commons IO 1.2
|
|
*/
|
|
public static void copyDirectoryToDirectory(File srcDir, File destDir) throws IOException {
|
|
if (srcDir == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (srcDir.exists() && srcDir.isDirectory() == false) {
|
|
throw new IllegalArgumentException("Source '" + destDir + "' is not a directory");
|
|
}
|
|
if (destDir == null) {
|
|
throw new NullPointerException("Destination must not be null");
|
|
}
|
|
if (destDir.exists() && destDir.isDirectory() == false) {
|
|
throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory");
|
|
}
|
|
copyDirectory(srcDir, new File(destDir, srcDir.getName()), true);
|
|
}
|
|
|
|
/**
|
|
* Copies a whole directory to a new location preserving the file dates.
|
|
* <p>
|
|
* This method copies the specified directory and all its child
|
|
* directories and files to the specified destination.
|
|
* The destination is the new location and name of the directory.
|
|
* <p>
|
|
* The destination directory is created if it does not exist.
|
|
* If the destination directory did exist, then this method merges
|
|
* the source with the destination, with the source taking precedence.
|
|
*
|
|
* @param srcDir an existing directory to copy, must not be <code>null</code>
|
|
* @param destDir the new directory, must not be <code>null</code>
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static void copyDirectory(File srcDir, File destDir) throws IOException {
|
|
copyDirectory(srcDir, destDir, true);
|
|
}
|
|
|
|
/**
|
|
* Copies a whole directory to a new location.
|
|
* <p>
|
|
* This method copies the contents of the specified source directory
|
|
* to within the specified destination directory.
|
|
* <p>
|
|
* The destination directory is created if it does not exist.
|
|
* If the destination directory did exist, then this method merges
|
|
* the source with the destination, with the source taking precedence.
|
|
*
|
|
* @param srcDir an existing directory to copy, must not be <code>null</code>
|
|
* @param destDir the new directory, must not be <code>null</code>
|
|
* @param preserveFileDate true if the file date of the copy
|
|
* should be the same as the original
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static void copyDirectory(File srcDir, File destDir,
|
|
boolean preserveFileDate) throws IOException {
|
|
copyDirectory(srcDir, destDir, null, preserveFileDate);
|
|
}
|
|
|
|
/**
|
|
* Copies a filtered directory to a new location preserving the file dates.
|
|
* <p>
|
|
* This method copies the contents of the specified source directory
|
|
* to within the specified destination directory.
|
|
* <p>
|
|
* The destination directory is created if it does not exist.
|
|
* If the destination directory did exist, then this method merges
|
|
* the source with the destination, with the source taking precedence.
|
|
*
|
|
* <h4>Example: Copy directories only</h4>
|
|
* <pre>
|
|
* // only copy the directory structure
|
|
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY);
|
|
* </pre>
|
|
*
|
|
* <h4>Example: Copy directories and txt files</h4>
|
|
* <pre>
|
|
* // Create a filter for ".txt" files
|
|
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
|
|
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
|
|
*
|
|
* // Create a filter for either directories or ".txt" files
|
|
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
|
|
*
|
|
* // Copy using the filter
|
|
* FileUtils.copyDirectory(srcDir, destDir, filter);
|
|
* </pre>
|
|
*
|
|
* @param srcDir an existing directory to copy, must not be <code>null</code>
|
|
* @param destDir the new directory, must not be <code>null</code>
|
|
* @param filter the filter to apply, null means copy all directories and files
|
|
* should be the same as the original
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static void copyDirectory(File srcDir, File destDir,
|
|
FileFilter filter) throws IOException {
|
|
copyDirectory(srcDir, destDir, filter, true);
|
|
}
|
|
|
|
/**
|
|
* Copies a filtered directory to a new location.
|
|
* <p>
|
|
* This method copies the contents of the specified source directory
|
|
* to within the specified destination directory.
|
|
* <p>
|
|
* The destination directory is created if it does not exist.
|
|
* If the destination directory did exist, then this method merges
|
|
* the source with the destination, with the source taking precedence.
|
|
*
|
|
* <h4>Example: Copy directories only</h4>
|
|
* <pre>
|
|
* // only copy the directory structure
|
|
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY, false);
|
|
* </pre>
|
|
*
|
|
* <h4>Example: Copy directories and txt files</h4>
|
|
* <pre>
|
|
* // Create a filter for ".txt" files
|
|
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
|
|
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
|
|
*
|
|
* // Create a filter for either directories or ".txt" files
|
|
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
|
|
*
|
|
* // Copy using the filter
|
|
* FileUtils.copyDirectory(srcDir, destDir, filter, false);
|
|
* </pre>
|
|
*
|
|
* @param srcDir an existing directory to copy, must not be <code>null</code>
|
|
* @param destDir the new directory, must not be <code>null</code>
|
|
* @param filter the filter to apply, null means copy all directories and files
|
|
* @param preserveFileDate true if the file date of the copy
|
|
* should be the same as the original
|
|
*
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs during copying
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static void copyDirectory(File srcDir, File destDir,
|
|
FileFilter filter, boolean preserveFileDate) throws IOException {
|
|
if (srcDir == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (destDir == null) {
|
|
throw new NullPointerException("Destination must not be null");
|
|
}
|
|
if (srcDir.exists() == false) {
|
|
throw new FileNotFoundException("Source '" + srcDir + "' does not exist");
|
|
}
|
|
if (srcDir.isDirectory() == false) {
|
|
throw new IOException("Source '" + srcDir + "' exists but is not a directory");
|
|
}
|
|
if (srcDir.getCanonicalPath().equals(destDir.getCanonicalPath())) {
|
|
throw new IOException("Source '" + srcDir + "' and destination '" + destDir + "' are the same");
|
|
}
|
|
|
|
// Cater for destination being directory within the source directory (see IO-141)
|
|
List<String> exclusionList = null;
|
|
if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath())) {
|
|
File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
|
|
if (srcFiles != null && srcFiles.length > 0) {
|
|
exclusionList = new ArrayList<String>(srcFiles.length);
|
|
for (int i = 0; i < srcFiles.length; i++) {
|
|
File copiedFile = new File(destDir, srcFiles[i].getName());
|
|
exclusionList.add(copiedFile.getCanonicalPath());
|
|
}
|
|
}
|
|
}
|
|
doCopyDirectory(srcDir, destDir, filter, preserveFileDate, exclusionList);
|
|
}
|
|
|
|
/**
|
|
* Internal copy directory method.
|
|
*
|
|
* @param srcDir the validated source directory, must not be <code>null</code>
|
|
* @param destDir the validated destination directory, must not be <code>null</code>
|
|
* @param filter the filter to apply, null means copy all directories and files
|
|
* @param preserveFileDate whether to preserve the file date
|
|
* @param exclusionList List of files and directories to exclude from the copy, may be null
|
|
* @throws IOException if an error occurs
|
|
* @since Commons IO 1.1
|
|
*/
|
|
private static void doCopyDirectory(File srcDir, File destDir, FileFilter filter,
|
|
boolean preserveFileDate, List<String> exclusionList) throws IOException {
|
|
if (destDir.exists()) {
|
|
if (destDir.isDirectory() == false) {
|
|
throw new IOException("Destination '" + destDir + "' exists but is not a directory");
|
|
}
|
|
} else {
|
|
if (destDir.mkdirs() == false) {
|
|
throw new IOException("Destination '" + destDir + "' directory cannot be created");
|
|
}
|
|
if (preserveFileDate) {
|
|
destDir.setLastModified(srcDir.lastModified());
|
|
}
|
|
}
|
|
if (destDir.canWrite() == false) {
|
|
throw new IOException("Destination '" + destDir + "' cannot be written to");
|
|
}
|
|
// recurse
|
|
File[] files = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
|
|
if (files == null) { // null if security restricted
|
|
throw new IOException("Failed to list contents of " + srcDir);
|
|
}
|
|
for (int i = 0; i < files.length; i++) {
|
|
File copiedFile = new File(destDir, files[i].getName());
|
|
if (exclusionList == null || !exclusionList.contains(files[i].getCanonicalPath())) {
|
|
if (files[i].isDirectory()) {
|
|
doCopyDirectory(files[i], copiedFile, filter, preserveFileDate, exclusionList);
|
|
} else {
|
|
doCopyFile(files[i], copiedFile, preserveFileDate);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Copies bytes from the URL <code>source</code> to a file
|
|
* <code>destination</code>. The directories up to <code>destination</code>
|
|
* will be created if they don't already exist. <code>destination</code>
|
|
* will be overwritten if it already exists.
|
|
*
|
|
* @param source the <code>URL</code> to copy bytes from, must not be <code>null</code>
|
|
* @param destination the non-directory <code>File</code> to write bytes to
|
|
* (possibly overwriting), must not be <code>null</code>
|
|
* @throws IOException if <code>source</code> URL cannot be opened
|
|
* @throws IOException if <code>destination</code> is a directory
|
|
* @throws IOException if <code>destination</code> cannot be written
|
|
* @throws IOException if <code>destination</code> needs creating but can't be
|
|
* @throws IOException if an IO error occurs during copying
|
|
*/
|
|
public static void copyURLToFile(URL source, File destination) throws IOException {
|
|
InputStream input = source.openStream();
|
|
try {
|
|
FileOutputStream output = openOutputStream(destination);
|
|
try {
|
|
IOUtils.copy(input, output);
|
|
} finally {
|
|
IOUtils.closeQuietly(output);
|
|
}
|
|
} finally {
|
|
IOUtils.closeQuietly(input);
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Deletes a directory recursively.
|
|
*
|
|
* @param directory directory to delete
|
|
* @throws IOException in case deletion is unsuccessful
|
|
*/
|
|
public static void deleteDirectory(File directory) throws IOException {
|
|
if (!directory.exists()) {
|
|
return;
|
|
}
|
|
|
|
cleanDirectory(directory);
|
|
if (!directory.delete()) {
|
|
String message =
|
|
"Unable to delete directory " + directory + ".";
|
|
throw new IOException(message);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Deletes a file, never throwing an exception. If file is a directory, delete it and all sub-directories.
|
|
* <p>
|
|
* The difference between File.delete() and this method are:
|
|
* <ul>
|
|
* <li>A directory to be deleted does not have to be empty.</li>
|
|
* <li>No exceptions are thrown when a file or directory cannot be deleted.</li>
|
|
* </ul>
|
|
*
|
|
* @param file file or directory to delete, can be <code>null</code>
|
|
* @return <code>true</code> if the file or directory was deleted, otherwise
|
|
* <code>false</code>
|
|
*
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static boolean deleteQuietly(File file) {
|
|
if (file == null) {
|
|
return false;
|
|
}
|
|
try {
|
|
if (file.isDirectory()) {
|
|
cleanDirectory(file);
|
|
}
|
|
} catch (Exception e) {
|
|
}
|
|
|
|
try {
|
|
return file.delete();
|
|
} catch (Exception e) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Cleans a directory without deleting it.
|
|
*
|
|
* @param directory directory to clean
|
|
* @throws IOException in case cleaning is unsuccessful
|
|
*/
|
|
public static void cleanDirectory(File directory) throws IOException {
|
|
if (!directory.exists()) {
|
|
String message = directory + " does not exist";
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
|
|
if (!directory.isDirectory()) {
|
|
String message = directory + " is not a directory";
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
|
|
File[] files = directory.listFiles();
|
|
if (files == null) { // null if security restricted
|
|
throw new IOException("Failed to list contents of " + directory);
|
|
}
|
|
|
|
IOException exception = null;
|
|
for (int i = 0; i < files.length; i++) {
|
|
File file = files[i];
|
|
try {
|
|
forceDelete(file);
|
|
} catch (IOException ioe) {
|
|
exception = ioe;
|
|
}
|
|
}
|
|
|
|
if (null != exception) {
|
|
throw exception;
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Waits for NFS to propagate a file creation, imposing a timeout.
|
|
* <p>
|
|
* This method repeatedly tests {@link File#exists()} until it returns
|
|
* true up to the maximum time specified in seconds.
|
|
*
|
|
* @param file the file to check, must not be <code>null</code>
|
|
* @param seconds the maximum time in seconds to wait
|
|
* @return true if file exists
|
|
* @throws NullPointerException if the file is <code>null</code>
|
|
*/
|
|
public static boolean waitFor(File file, int seconds) {
|
|
int timeout = 0;
|
|
int tick = 0;
|
|
while (!file.exists()) {
|
|
if (tick++ >= 10) {
|
|
tick = 0;
|
|
if (timeout++ > seconds) {
|
|
return false;
|
|
}
|
|
}
|
|
try {
|
|
Thread.sleep(100);
|
|
} catch (InterruptedException ignore) {
|
|
// ignore exception
|
|
} catch (Exception ex) {
|
|
break;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Reads the contents of a file into a String.
|
|
* The file is always closed.
|
|
*
|
|
* @param file the file to read, must not be <code>null</code>
|
|
* @param encoding the encoding to use, <code>null</code> means platform default
|
|
* @return the file contents, never <code>null</code>
|
|
* @throws IOException in case of an I/O error
|
|
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
|
|
*/
|
|
public static String readFileToString(File file, String encoding) throws IOException {
|
|
InputStream in = null;
|
|
try {
|
|
in = openInputStream(file);
|
|
return IOUtils.toString(in, encoding);
|
|
} finally {
|
|
IOUtils.closeQuietly(in);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Reads the contents of a file into a String using the default encoding for the VM.
|
|
* The file is always closed.
|
|
*
|
|
* @param file the file to read, must not be <code>null</code>
|
|
* @return the file contents, never <code>null</code>
|
|
* @throws IOException in case of an I/O error
|
|
* @since Commons IO 1.3.1
|
|
*/
|
|
public static String readFileToString(File file) throws IOException {
|
|
return readFileToString(file, null);
|
|
}
|
|
|
|
/**
|
|
* Reads the contents of a file into a byte array.
|
|
* The file is always closed.
|
|
*
|
|
* @param file the file to read, must not be <code>null</code>
|
|
* @return the file contents, never <code>null</code>
|
|
* @throws IOException in case of an I/O error
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static byte[] readFileToByteArray(File file) throws IOException {
|
|
InputStream in = null;
|
|
try {
|
|
in = openInputStream(file);
|
|
return IOUtils.toByteArray(in);
|
|
} finally {
|
|
IOUtils.closeQuietly(in);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reads the contents of a file line by line to a List of Strings.
|
|
* The file is always closed.
|
|
*
|
|
* @param file the file to read, must not be <code>null</code>
|
|
* @param encoding the encoding to use, <code>null</code> means platform default
|
|
* @return the list of Strings representing each line in the file, never <code>null</code>
|
|
* @throws IOException in case of an I/O error
|
|
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static List<String> readLines(File file, String encoding) throws IOException {
|
|
InputStream in = null;
|
|
try {
|
|
in = openInputStream(file);
|
|
return IOUtils.readLines(in, encoding);
|
|
} finally {
|
|
IOUtils.closeQuietly(in);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reads the contents of a file line by line to a List of Strings using the default encoding for the VM.
|
|
* The file is always closed.
|
|
*
|
|
* @param file the file to read, must not be <code>null</code>
|
|
* @return the list of Strings representing each line in the file, never <code>null</code>
|
|
* @throws IOException in case of an I/O error
|
|
* @since Commons IO 1.3
|
|
*/
|
|
public static List<String> readLines(File file) throws IOException {
|
|
return readLines(file, null);
|
|
}
|
|
|
|
/**
|
|
* Returns an Iterator for the lines in a <code>File</code>.
|
|
* <p>
|
|
* This method opens an <code>InputStream</code> for the file.
|
|
* When you have finished with the iterator you should close the stream
|
|
* to free internal resources. This can be done by calling the
|
|
* {@link LineIterator#close()} or
|
|
* {@link LineIterator#closeQuietly(LineIterator)} method.
|
|
* <p>
|
|
* The recommended usage pattern is:
|
|
* <pre>
|
|
* LineIterator it = FileUtils.lineIterator(file, "UTF-8");
|
|
* try {
|
|
* while (it.hasNext()) {
|
|
* String line = it.nextLine();
|
|
* /// do something with line
|
|
* }
|
|
* } finally {
|
|
* LineIterator.closeQuietly(iterator);
|
|
* }
|
|
* </pre>
|
|
* <p>
|
|
* If an exception occurs during the creation of the iterator, the
|
|
* underlying stream is closed.
|
|
*
|
|
* @param file the file to open for input, must not be <code>null</code>
|
|
* @param encoding the encoding to use, <code>null</code> means platform default
|
|
* @return an Iterator of the lines in the file, never <code>null</code>
|
|
* @throws IOException in case of an I/O error (file closed)
|
|
* @since Commons IO 1.2
|
|
*/
|
|
public static LineIterator lineIterator(File file, String encoding) throws IOException {
|
|
InputStream in = null;
|
|
try {
|
|
in = openInputStream(file);
|
|
return IOUtils.lineIterator(in, encoding);
|
|
} catch (IOException ex) {
|
|
IOUtils.closeQuietly(in);
|
|
throw ex;
|
|
} catch (RuntimeException ex) {
|
|
IOUtils.closeQuietly(in);
|
|
throw ex;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns an Iterator for the lines in a <code>File</code> using the default encoding for the VM.
|
|
*
|
|
* @param file the file to open for input, must not be <code>null</code>
|
|
* @return an Iterator of the lines in the file, never <code>null</code>
|
|
* @throws IOException in case of an I/O error (file closed)
|
|
* @since Commons IO 1.3
|
|
* @see #lineIterator(File, String)
|
|
*/
|
|
public static LineIterator lineIterator(File file) throws IOException {
|
|
return lineIterator(file, null);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Writes a String to a file creating the file if it does not exist.
|
|
*
|
|
* NOTE: As from v1.3, the parent directories of the file will be created
|
|
* if they do not exist.
|
|
*
|
|
* @param file the file to write
|
|
* @param data the content to write to the file
|
|
* @param encoding the encoding to use, <code>null</code> means platform default
|
|
* @throws IOException in case of an I/O error
|
|
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
|
|
*/
|
|
public static void writeStringToFile(File file, String data, String encoding) throws IOException {
|
|
OutputStream out = null;
|
|
try {
|
|
out = openOutputStream(file);
|
|
IOUtils.write(data, out, encoding);
|
|
} finally {
|
|
IOUtils.closeQuietly(out);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes a String to a file creating the file if it does not exist using the default encoding for the VM.
|
|
*
|
|
* @param file the file to write
|
|
* @param data the content to write to the file
|
|
* @throws IOException in case of an I/O error
|
|
*/
|
|
public static void writeStringToFile(File file, String data) throws IOException {
|
|
writeStringToFile(file, data, null);
|
|
}
|
|
|
|
/**
|
|
* Writes a byte array to a file creating the file if it does not exist.
|
|
* <p>
|
|
* NOTE: As from v1.3, the parent directories of the file will be created
|
|
* if they do not exist.
|
|
*
|
|
* @param file the file to write to
|
|
* @param data the content to write to the file
|
|
* @throws IOException in case of an I/O error
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static void writeByteArrayToFile(File file, byte[] data) throws IOException {
|
|
OutputStream out = null;
|
|
try {
|
|
out = openOutputStream(file);
|
|
out.write(data);
|
|
} finally {
|
|
IOUtils.closeQuietly(out);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes the <code>toString()</code> value of each item in a collection to
|
|
* the specified <code>File</code> line by line.
|
|
* The specified character encoding and the default line ending will be used.
|
|
* <p>
|
|
* NOTE: As from v1.3, the parent directories of the file will be created
|
|
* if they do not exist.
|
|
*
|
|
* @param file the file to write to
|
|
* @param encoding the encoding to use, <code>null</code> means platform default
|
|
* @param lines the lines to write, <code>null</code> entries produce blank lines
|
|
* @throws IOException in case of an I/O error
|
|
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static void writeLines(File file, String encoding, Collection<Object> lines) throws IOException {
|
|
writeLines(file, encoding, lines, null);
|
|
}
|
|
|
|
/**
|
|
* Writes the <code>toString()</code> value of each item in a collection to
|
|
* the specified <code>File</code> line by line.
|
|
* The default VM encoding and the default line ending will be used.
|
|
*
|
|
* @param file the file to write to
|
|
* @param lines the lines to write, <code>null</code> entries produce blank lines
|
|
* @throws IOException in case of an I/O error
|
|
* @since Commons IO 1.3
|
|
*/
|
|
public static void writeLines(File file, Collection<Object> lines) throws IOException {
|
|
writeLines(file, null, lines, null);
|
|
}
|
|
|
|
/**
|
|
* Writes the <code>toString()</code> value of each item in a collection to
|
|
* the specified <code>File</code> line by line.
|
|
* The specified character encoding and the line ending will be used.
|
|
* <p>
|
|
* NOTE: As from v1.3, the parent directories of the file will be created
|
|
* if they do not exist.
|
|
*
|
|
* @param file the file to write to
|
|
* @param encoding the encoding to use, <code>null</code> means platform default
|
|
* @param lines the lines to write, <code>null</code> entries produce blank lines
|
|
* @param lineEnding the line separator to use, <code>null</code> is system default
|
|
* @throws IOException in case of an I/O error
|
|
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
|
|
* @since Commons IO 1.1
|
|
*/
|
|
public static void writeLines(File file, String encoding, Collection<Object> lines, String lineEnding) throws IOException {
|
|
OutputStream out = null;
|
|
try {
|
|
out = openOutputStream(file);
|
|
IOUtils.writeLines(lines, lineEnding, out, encoding);
|
|
} finally {
|
|
IOUtils.closeQuietly(out);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes the <code>toString()</code> value of each item in a collection to
|
|
* the specified <code>File</code> line by line.
|
|
* The default VM encoding and the specified line ending will be used.
|
|
*
|
|
* @param file the file to write to
|
|
* @param lines the lines to write, <code>null</code> entries produce blank lines
|
|
* @param lineEnding the line separator to use, <code>null</code> is system default
|
|
* @throws IOException in case of an I/O error
|
|
* @since Commons IO 1.3
|
|
*/
|
|
public static void writeLines(File file, Collection<Object> lines, String lineEnding) throws IOException {
|
|
writeLines(file, null, lines, lineEnding);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Deletes a file. If file is a directory, delete it and all sub-directories.
|
|
* <p>
|
|
* The difference between File.delete() and this method are:
|
|
* <ul>
|
|
* <li>A directory to be deleted does not have to be empty.</li>
|
|
* <li>You get exceptions when a file or directory cannot be deleted.
|
|
* (java.io.File methods returns a boolean)</li>
|
|
* </ul>
|
|
*
|
|
* @param file file or directory to delete, must not be <code>null</code>
|
|
* @throws NullPointerException if the directory is <code>null</code>
|
|
* @throws FileNotFoundException if the file was not found
|
|
* @throws IOException in case deletion is unsuccessful
|
|
*/
|
|
public static void forceDelete(File file) throws IOException {
|
|
if (file.isDirectory()) {
|
|
deleteDirectory(file);
|
|
} else {
|
|
boolean filePresent = file.exists();
|
|
if (!file.delete()) {
|
|
if (!filePresent){
|
|
throw new FileNotFoundException("File does not exist: " + file);
|
|
}
|
|
String message =
|
|
"Unable to delete file: " + file;
|
|
throw new IOException(message);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Schedules a file to be deleted when JVM exits.
|
|
* If file is directory delete it and all sub-directories.
|
|
*
|
|
* @param file file or directory to delete, must not be <code>null</code>
|
|
* @throws NullPointerException if the file is <code>null</code>
|
|
* @throws IOException in case deletion is unsuccessful
|
|
*/
|
|
public static void forceDeleteOnExit(File file) throws IOException {
|
|
if (file.isDirectory()) {
|
|
deleteDirectoryOnExit(file);
|
|
} else {
|
|
file.deleteOnExit();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Schedules a directory recursively for deletion on JVM exit.
|
|
*
|
|
* @param directory directory to delete, must not be <code>null</code>
|
|
* @throws NullPointerException if the directory is <code>null</code>
|
|
* @throws IOException in case deletion is unsuccessful
|
|
*/
|
|
private static void deleteDirectoryOnExit(File directory) throws IOException {
|
|
if (!directory.exists()) {
|
|
return;
|
|
}
|
|
|
|
cleanDirectoryOnExit(directory);
|
|
directory.deleteOnExit();
|
|
}
|
|
|
|
/**
|
|
* Cleans a directory without deleting it.
|
|
*
|
|
* @param directory directory to clean, must not be <code>null</code>
|
|
* @throws NullPointerException if the directory is <code>null</code>
|
|
* @throws IOException in case cleaning is unsuccessful
|
|
*/
|
|
private static void cleanDirectoryOnExit(File directory) throws IOException {
|
|
if (!directory.exists()) {
|
|
String message = directory + " does not exist";
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
|
|
if (!directory.isDirectory()) {
|
|
String message = directory + " is not a directory";
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
|
|
File[] files = directory.listFiles();
|
|
if (files == null) { // null if security restricted
|
|
throw new IOException("Failed to list contents of " + directory);
|
|
}
|
|
|
|
IOException exception = null;
|
|
for (int i = 0; i < files.length; i++) {
|
|
File file = files[i];
|
|
try {
|
|
forceDeleteOnExit(file);
|
|
} catch (IOException ioe) {
|
|
exception = ioe;
|
|
}
|
|
}
|
|
|
|
if (null != exception) {
|
|
throw exception;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Makes a directory, including any necessary but nonexistent parent
|
|
* directories. If there already exists a file with specified name or
|
|
* the directory cannot be created then an exception is thrown.
|
|
*
|
|
* @param directory directory to create, must not be <code>null</code>
|
|
* @throws NullPointerException if the directory is <code>null</code>
|
|
* @throws IOException if the directory cannot be created
|
|
*/
|
|
public static void forceMkdir(File directory) throws IOException {
|
|
if (directory.exists()) {
|
|
if (directory.isFile()) {
|
|
String message =
|
|
"File "
|
|
+ directory
|
|
+ " exists and is "
|
|
+ "not a directory. Unable to create directory.";
|
|
throw new IOException(message);
|
|
}
|
|
} else {
|
|
if (!directory.mkdirs()) {
|
|
String message =
|
|
"Unable to create directory " + directory;
|
|
throw new IOException(message);
|
|
}
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Counts the size of a directory recursively (sum of the length of all files).
|
|
*
|
|
* @param directory directory to inspect, must not be <code>null</code>
|
|
* @return size of directory in bytes, 0 if directory is security restricted
|
|
* @throws NullPointerException if the directory is <code>null</code>
|
|
*/
|
|
public static long sizeOfDirectory(File directory) {
|
|
if (!directory.exists()) {
|
|
String message = directory + " does not exist";
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
|
|
if (!directory.isDirectory()) {
|
|
String message = directory + " is not a directory";
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
|
|
long size = 0;
|
|
|
|
File[] files = directory.listFiles();
|
|
if (files == null) { // null if security restricted
|
|
return 0L;
|
|
}
|
|
for (int i = 0; i < files.length; i++) {
|
|
File file = files[i];
|
|
|
|
if (file.isDirectory()) {
|
|
size += sizeOfDirectory(file);
|
|
} else {
|
|
size += file.length();
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Tests if the specified <code>File</code> is newer than the reference
|
|
* <code>File</code>.
|
|
*
|
|
* @param file the <code>File</code> of which the modification date must
|
|
* be compared, must not be <code>null</code>
|
|
* @param reference the <code>File</code> of which the modification date
|
|
* is used, must not be <code>null</code>
|
|
* @return true if the <code>File</code> exists and has been modified more
|
|
* recently than the reference <code>File</code>
|
|
* @throws IllegalArgumentException if the file is <code>null</code>
|
|
* @throws IllegalArgumentException if the reference file is <code>null</code> or doesn't exist
|
|
*/
|
|
public static boolean isFileNewer(File file, File reference) {
|
|
if (reference == null) {
|
|
throw new IllegalArgumentException("No specified reference file");
|
|
}
|
|
if (!reference.exists()) {
|
|
throw new IllegalArgumentException("The reference file '"
|
|
+ file + "' doesn't exist");
|
|
}
|
|
return isFileNewer(file, reference.lastModified());
|
|
}
|
|
|
|
/**
|
|
* Tests if the specified <code>File</code> is newer than the specified
|
|
* <code>Date</code>.
|
|
*
|
|
* @param file the <code>File</code> of which the modification date
|
|
* must be compared, must not be <code>null</code>
|
|
* @param date the date reference, must not be <code>null</code>
|
|
* @return true if the <code>File</code> exists and has been modified
|
|
* after the given <code>Date</code>.
|
|
* @throws IllegalArgumentException if the file is <code>null</code>
|
|
* @throws IllegalArgumentException if the date is <code>null</code>
|
|
*/
|
|
public static boolean isFileNewer(File file, Date date) {
|
|
if (date == null) {
|
|
throw new IllegalArgumentException("No specified date");
|
|
}
|
|
return isFileNewer(file, date.getTime());
|
|
}
|
|
|
|
/**
|
|
* Tests if the specified <code>File</code> is newer than the specified
|
|
* time reference.
|
|
*
|
|
* @param file the <code>File</code> of which the modification date must
|
|
* be compared, must not be <code>null</code>
|
|
* @param timeMillis the time reference measured in milliseconds since the
|
|
* epoch (00:00:00 GMT, January 1, 1970)
|
|
* @return true if the <code>File</code> exists and has been modified after
|
|
* the given time reference.
|
|
* @throws IllegalArgumentException if the file is <code>null</code>
|
|
*/
|
|
public static boolean isFileNewer(File file, long timeMillis) {
|
|
if (file == null) {
|
|
throw new IllegalArgumentException("No specified file");
|
|
}
|
|
if (!file.exists()) {
|
|
return false;
|
|
}
|
|
return file.lastModified() > timeMillis;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Tests if the specified <code>File</code> is older than the reference
|
|
* <code>File</code>.
|
|
*
|
|
* @param file the <code>File</code> of which the modification date must
|
|
* be compared, must not be <code>null</code>
|
|
* @param reference the <code>File</code> of which the modification date
|
|
* is used, must not be <code>null</code>
|
|
* @return true if the <code>File</code> exists and has been modified before
|
|
* the reference <code>File</code>
|
|
* @throws IllegalArgumentException if the file is <code>null</code>
|
|
* @throws IllegalArgumentException if the reference file is <code>null</code> or doesn't exist
|
|
*/
|
|
public static boolean isFileOlder(File file, File reference) {
|
|
if (reference == null) {
|
|
throw new IllegalArgumentException("No specified reference file");
|
|
}
|
|
if (!reference.exists()) {
|
|
throw new IllegalArgumentException("The reference file '"
|
|
+ file + "' doesn't exist");
|
|
}
|
|
return isFileOlder(file, reference.lastModified());
|
|
}
|
|
|
|
/**
|
|
* Tests if the specified <code>File</code> is older than the specified
|
|
* <code>Date</code>.
|
|
*
|
|
* @param file the <code>File</code> of which the modification date
|
|
* must be compared, must not be <code>null</code>
|
|
* @param date the date reference, must not be <code>null</code>
|
|
* @return true if the <code>File</code> exists and has been modified
|
|
* before the given <code>Date</code>.
|
|
* @throws IllegalArgumentException if the file is <code>null</code>
|
|
* @throws IllegalArgumentException if the date is <code>null</code>
|
|
*/
|
|
public static boolean isFileOlder(File file, Date date) {
|
|
if (date == null) {
|
|
throw new IllegalArgumentException("No specified date");
|
|
}
|
|
return isFileOlder(file, date.getTime());
|
|
}
|
|
|
|
/**
|
|
* Tests if the specified <code>File</code> is older than the specified
|
|
* time reference.
|
|
*
|
|
* @param file the <code>File</code> of which the modification date must
|
|
* be compared, must not be <code>null</code>
|
|
* @param timeMillis the time reference measured in milliseconds since the
|
|
* epoch (00:00:00 GMT, January 1, 1970)
|
|
* @return true if the <code>File</code> exists and has been modified before
|
|
* the given time reference.
|
|
* @throws IllegalArgumentException if the file is <code>null</code>
|
|
*/
|
|
public static boolean isFileOlder(File file, long timeMillis) {
|
|
if (file == null) {
|
|
throw new IllegalArgumentException("No specified file");
|
|
}
|
|
if (!file.exists()) {
|
|
return false;
|
|
}
|
|
return file.lastModified() < timeMillis;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Computes the checksum of a file using the CRC32 checksum routine.
|
|
* The value of the checksum is returned.
|
|
*
|
|
* @param file the file to checksum, must not be <code>null</code>
|
|
* @return the checksum value
|
|
* @throws NullPointerException if the file or checksum is <code>null</code>
|
|
* @throws IllegalArgumentException if the file is a directory
|
|
* @throws IOException if an IO error occurs reading the file
|
|
* @since Commons IO 1.3
|
|
*/
|
|
public static long checksumCRC32(File file) throws IOException {
|
|
CRC32 crc = new CRC32();
|
|
checksum(file, crc);
|
|
return crc.getValue();
|
|
}
|
|
|
|
/**
|
|
* Computes the checksum of a file using the specified checksum object.
|
|
* Multiple files may be checked using one <code>Checksum</code> instance
|
|
* if desired simply by reusing the same checksum object.
|
|
* For example:
|
|
* <pre>
|
|
* long csum = FileUtils.checksum(file, new CRC32()).getValue();
|
|
* </pre>
|
|
*
|
|
* @param file the file to checksum, must not be <code>null</code>
|
|
* @param checksum the checksum object to be used, must not be <code>null</code>
|
|
* @return the checksum specified, updated with the content of the file
|
|
* @throws NullPointerException if the file or checksum is <code>null</code>
|
|
* @throws IllegalArgumentException if the file is a directory
|
|
* @throws IOException if an IO error occurs reading the file
|
|
* @since Commons IO 1.3
|
|
*/
|
|
public static Checksum checksum(File file, Checksum checksum) throws IOException {
|
|
if (file.isDirectory()) {
|
|
throw new IllegalArgumentException("Checksums can't be computed on directories");
|
|
}
|
|
InputStream in = null;
|
|
try {
|
|
in = new CheckedInputStream(new FileInputStream(file), checksum);
|
|
IOUtils.copy(in, new NullOutputStream());
|
|
} finally {
|
|
IOUtils.closeQuietly(in);
|
|
}
|
|
return checksum;
|
|
}
|
|
|
|
/**
|
|
* Moves a directory.
|
|
* <p>
|
|
* When the destination directory is on another file system, do a "copy and delete".
|
|
*
|
|
* @param srcDir the directory to be moved
|
|
* @param destDir the destination directory
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs moving the file
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static void moveDirectory(File srcDir, File destDir) throws IOException {
|
|
if (srcDir == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (destDir == null) {
|
|
throw new NullPointerException("Destination must not be null");
|
|
}
|
|
if (!srcDir.exists()) {
|
|
throw new FileNotFoundException("Source '" + srcDir + "' does not exist");
|
|
}
|
|
if (!srcDir.isDirectory()) {
|
|
throw new IOException("Source '" + srcDir + "' is not a directory");
|
|
}
|
|
if (destDir.exists()) {
|
|
throw new IOException("Destination '" + destDir + "' already exists");
|
|
}
|
|
boolean rename = srcDir.renameTo(destDir);
|
|
if (!rename) {
|
|
copyDirectory( srcDir, destDir );
|
|
deleteDirectory( srcDir );
|
|
if (srcDir.exists()) {
|
|
throw new IOException("Failed to delete original directory '" + srcDir +
|
|
"' after copy to '" + destDir + "'");
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Moves a directory to another directory.
|
|
*
|
|
* @param src the file to be moved
|
|
* @param destDir the destination file
|
|
* @param createDestDir If <code>true</code> create the destination directory,
|
|
* otherwise if <code>false</code> throw an IOException
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs moving the file
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static void moveDirectoryToDirectory(File src, File destDir, boolean createDestDir) throws IOException {
|
|
if (src == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (destDir == null) {
|
|
throw new NullPointerException("Destination directory must not be null");
|
|
}
|
|
if (!destDir.exists() && createDestDir) {
|
|
destDir.mkdirs();
|
|
}
|
|
if (!destDir.exists()) {
|
|
throw new FileNotFoundException("Destination directory '" + destDir +
|
|
"' does not exist [createDestDir=" + createDestDir +"]");
|
|
}
|
|
if (!destDir.isDirectory()) {
|
|
throw new IOException("Destination '" + destDir + "' is not a directory");
|
|
}
|
|
moveDirectory(src, new File(destDir, src.getName()));
|
|
|
|
}
|
|
|
|
/**
|
|
* Moves a file.
|
|
* <p>
|
|
* When the destination file is on another file system, do a "copy and delete".
|
|
*
|
|
* @param srcFile the file to be moved
|
|
* @param destFile the destination file
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs moving the file
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static void moveFile(File srcFile, File destFile) throws IOException {
|
|
if (srcFile == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (destFile == null) {
|
|
throw new NullPointerException("Destination must not be null");
|
|
}
|
|
if (!srcFile.exists()) {
|
|
throw new FileNotFoundException("Source '" + srcFile + "' does not exist");
|
|
}
|
|
if (srcFile.isDirectory()) {
|
|
throw new IOException("Source '" + srcFile + "' is a directory");
|
|
}
|
|
if (destFile.exists()) {
|
|
throw new IOException("Destination '" + destFile + "' already exists");
|
|
}
|
|
if (destFile.isDirectory()) {
|
|
throw new IOException("Destination '" + destFile + "' is a directory");
|
|
}
|
|
boolean rename = srcFile.renameTo(destFile);
|
|
if (!rename) {
|
|
copyFile( srcFile, destFile );
|
|
if (!srcFile.delete()) {
|
|
FileUtils.deleteQuietly(destFile);
|
|
throw new IOException("Failed to delete original file '" + srcFile +
|
|
"' after copy to '" + destFile + "'");
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Moves a file to a directory.
|
|
*
|
|
* @param srcFile the file to be moved
|
|
* @param destDir the destination file
|
|
* @param createDestDir If <code>true</code> create the destination directory,
|
|
* otherwise if <code>false</code> throw an IOException
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs moving the file
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static void moveFileToDirectory(File srcFile, File destDir, boolean createDestDir) throws IOException {
|
|
if (srcFile == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (destDir == null) {
|
|
throw new NullPointerException("Destination directory must not be null");
|
|
}
|
|
if (!destDir.exists() && createDestDir) {
|
|
destDir.mkdirs();
|
|
}
|
|
if (!destDir.exists()) {
|
|
throw new FileNotFoundException("Destination directory '" + destDir +
|
|
"' does not exist [createDestDir=" + createDestDir +"]");
|
|
}
|
|
if (!destDir.isDirectory()) {
|
|
throw new IOException("Destination '" + destDir + "' is not a directory");
|
|
}
|
|
moveFile(srcFile, new File(destDir, srcFile.getName()));
|
|
}
|
|
|
|
/**
|
|
* Moves a file or directory to the destination directory.
|
|
* <p>
|
|
* When the destination is on another file system, do a "copy and delete".
|
|
*
|
|
* @param src the file or directory to be moved
|
|
* @param destDir the destination directory
|
|
* @param createDestDir If <code>true</code> create the destination directory,
|
|
* otherwise if <code>false</code> throw an IOException
|
|
* @throws NullPointerException if source or destination is <code>null</code>
|
|
* @throws IOException if source or destination is invalid
|
|
* @throws IOException if an IO error occurs moving the file
|
|
* @since Commons IO 1.4
|
|
*/
|
|
public static void moveToDirectory(File src, File destDir, boolean createDestDir) throws IOException {
|
|
if (src == null) {
|
|
throw new NullPointerException("Source must not be null");
|
|
}
|
|
if (destDir == null) {
|
|
throw new NullPointerException("Destination must not be null");
|
|
}
|
|
if (!src.exists()) {
|
|
throw new FileNotFoundException("Source '" + src + "' does not exist");
|
|
}
|
|
if (src.isDirectory()) {
|
|
moveDirectoryToDirectory(src, destDir, createDestDir);
|
|
} else {
|
|
moveFileToDirectory(src, destDir, createDestDir);
|
|
}
|
|
}
|
|
|
|
}
|