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/*
* Copyright 2000,2002-2004 Apache Software Foundation
*
* Licensed 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.
*
*/
package org.apache.tools.ant.taskdefs;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Copies all data from an input stream to an output stream.
*
* @author thomas.haas@softwired-inc.com
* @since Ant 1.2
*/
public class StreamPumper implements Runnable {
// TODO: make SIZE an instance variable.
// TODO: add a status flag to note if an error occurred in run.
private static final int SIZE = 128;
private InputStream is;
private OutputStream os;
private boolean finished;
private boolean closeWhenExhausted;
/**
* Create a new stream pumper.
*
* @param is input stream to read data from
* @param os output stream to write data to.
* @param closeWhenExhausted if true, the output stream will be closed when
* the input is exhausted.
*/
public StreamPumper(InputStream is, OutputStream os,
boolean closeWhenExhausted) {
this.is = is;
this.os = os;
this.closeWhenExhausted = closeWhenExhausted;
}
/**
* Create a new stream pumper.
*
* @param is input stream to read data from
* @param os output stream to write data to.
*/
public StreamPumper(InputStream is, OutputStream os) {
this(is, os, false);
}
/**
* Copies data from the input stream to the output stream.
*
* Terminates as soon as the input stream is closed or an error occurs.
*/
public void run() {
synchronized (this) {
// Just in case this object is reused in the future
finished = false;
}
final byte[] buf = new byte[SIZE];
int length;
try {
while ((length = is.read(buf)) > 0) {
os.write(buf, 0, length);
}
} catch (Exception e) {
// ignore errors
} finally {
if (closeWhenExhausted) {
try {
os.close();
} catch (IOException e) {
// ignore
}
}
synchronized (this) {
finished = true;
notifyAll();
}
}
}
/**
* Tells whether the end of the stream has been reached.
* @return true is the stream has been exhausted.
**/
public synchronized boolean isFinished() {
return finished;
}
/**
* This method blocks until the stream pumper finishes.
* @see #isFinished()
**/
public synchronized void waitFor()
throws InterruptedException {
while (!isFinished()) {
wait();
}
}
}
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