/*
* The MIT License
*
* Copyright (c) 2010, CloudBees, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package hudson.util.io;
import hudson.util.IOException2;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* {@link OutputStream} that writes to a file.
*
* <p>
* Unlike regular {@link FileOutputStream}, this implementation allows the caller to close,
* and then keep writing.
*
* @author Kohsuke Kawaguchi
*/
public class ReopenableFileOutputStream extends OutputStream {
protected final File out;
private OutputStream current;
private boolean appendOnNextOpen = false;
public ReopenableFileOutputStream(File out) {
this.out = out;
}
private synchronized OutputStream current() throws IOException {
if (current==null)
try {
current = new FileOutputStream(out,appendOnNextOpen);
} catch (FileNotFoundException e) {
throw new IOException2("Failed to open "+out,e);
}
return current;
}
@Override
public void write(int b) throws IOException {
current().write(b);
}
@Override
public void write(byte[] b) throws IOException {
current().write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
current().write(b, off, len);
}
@Override
public void flush() throws IOException {
current().flush();
}
@Override
public synchronized void close() throws IOException {
if (current!=null) {
current.close();
appendOnNextOpen = true;
current = null;
}
}
/**
* In addition to close, ensure that the next "open" would truncate the file.
*/
public synchronized void rewind() throws IOException {
close();
appendOnNextOpen = false;
}
}