replicant-frameworks_native/awt/javax/imageio/stream/FileImageOutputStream.java
2008-12-17 18:05:43 -08:00

129 lines
3.4 KiB
Java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Rustem V. Rafikov
* @version $Revision: 1.3 $
*/
package javax.imageio.stream;
import java.io.*;
/**
* The FileImageOutputStream class implements ImageOutputStream and writes the
* output data to a File or RandomAccessFile.
*
* @since Android 1.0
*/
public class FileImageOutputStream extends ImageOutputStreamImpl {
/**
* The file.
*/
RandomAccessFile file;
/**
* Instantiates a new FileImageOutputStream with the specified File.
*
* @param f
* the output File.
* @throws FileNotFoundException
* if the file not found.
* @throws IOException
* if an I/O exception has occurred.
*/
public FileImageOutputStream(File f) throws FileNotFoundException, IOException {
this(f != null ? new RandomAccessFile(f, "rw") : null);
}
/**
* Instantiates a new FileImageOutputStream with the specified
* RandomAccessFile.
*
* @param raf
* the output RandomAccessFile.
*/
public FileImageOutputStream(RandomAccessFile raf) {
if (raf == null) {
throw new IllegalArgumentException("file should not be NULL");
}
file = raf;
}
@Override
public void write(int b) throws IOException {
checkClosed();
// according to the spec for ImageOutputStreamImpl#flushBits()
flushBits();
file.write(b);
streamPos++;
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
checkClosed();
// according to the spec for ImageOutputStreamImpl#flushBits()
flushBits();
file.write(b, off, len);
streamPos += len;
}
@Override
public int read() throws IOException {
checkClosed();
int rt = file.read();
if (rt != -1) {
streamPos++;
}
return rt;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
checkClosed();
int rt = file.read(b, off, len);
if (rt != -1) {
streamPos += rt;
}
return rt;
}
@Override
public long length() {
try {
checkClosed();
return file.length();
} catch (IOException e) {
return super.length(); // -1L
}
}
@Override
public void seek(long pos) throws IOException {
// -- checkClosed() is performed in super.seek()
super.seek(pos);
file.seek(pos);
streamPos = file.getFilePointer();
}
@Override
public void close() throws IOException {
super.close();
file.close();
}
}