104 lines
3.5 KiB
Java
104 lines
3.5 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.filefilter;
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import java.io.File;
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import java.io.Serializable;
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/**
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* Filters files based on size, can filter either smaller files or
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* files equal to or larger than a given threshold.
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* <p>
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* For example, to print all files and directories in the
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* current directory whose size is greater than 1 MB:
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*
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* <pre>
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* File dir = new File(".");
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* String[] files = dir.list( new SizeFileFilter(1024 * 1024) );
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* for ( int i = 0; i < files.length; i++ ) {
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* System.out.println(files[i]);
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* }
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* </pre>
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*
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* @author Rahul Akolkar
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* @version $Id: SizeFileFilter.java 591058 2007-11-01 15:47:05Z niallp $
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* @since Commons IO 1.2
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*/
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public class SizeFileFilter extends AbstractFileFilter implements Serializable {
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/** The size threshold. */
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private final long size;
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/** Whether the files accepted will be larger or smaller. */
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private final boolean acceptLarger;
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/**
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* Constructs a new size file filter for files equal to or
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* larger than a certain size.
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*
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* @param size the threshold size of the files
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* @throws IllegalArgumentException if the size is negative
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*/
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public SizeFileFilter(long size) {
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this(size, true);
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}
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/**
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* Constructs a new size file filter for files based on a certain size
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* threshold.
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*
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* @param size the threshold size of the files
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* @param acceptLarger if true, files equal to or larger are accepted,
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* otherwise smaller ones (but not equal to)
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* @throws IllegalArgumentException if the size is negative
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*/
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public SizeFileFilter(long size, boolean acceptLarger) {
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if (size < 0) {
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throw new IllegalArgumentException("The size must be non-negative");
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}
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this.size = size;
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this.acceptLarger = acceptLarger;
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}
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//-----------------------------------------------------------------------
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/**
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* Checks to see if the size of the file is favorable.
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* <p>
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* If size equals threshold and smaller files are required,
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* file <b>IS NOT</b> selected.
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* If size equals threshold and larger files are required,
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* file <b>IS</b> selected.
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*
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* @param file the File to check
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* @return true if the filename matches
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*/
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public boolean accept(File file) {
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boolean smaller = file.length() < size;
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return acceptLarger ? !smaller : smaller;
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}
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/**
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* Provide a String representaion of this file filter.
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*
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* @return a String representaion
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*/
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public String toString() {
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String condition = acceptLarger ? ">=" : "<";
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return super.toString() + "(" + condition + size + ")";
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}
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}
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