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/*
* Java Exec Pipe Library
*
* Copyright (c) Matthew Johnson 2005
*
* 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.
*
* To Contact the author, please email src@matthew.ath.cx
*
*/
package cx.ath.matthew.io;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Copies from an input stream to an output stream using a Thread.
* example:
*
* <pre>
* InputStream a = getInputStream();
* OutputStream b = getOutputStream();
* InOutCopier copier = new InOutCopier(a, b);
* copier.start();
* <do stuff that writes to the inputstream>
* </pre>
*/
public class InOutCopier extends Thread
{
private static final int BUFSIZE=1024;
private static final int POLLTIME=100;
private BufferedInputStream is;
private OutputStream os;
private boolean enable;
/**
* Create a copier from an inputstream to an outputstream
* @param is The stream to copy from
* @param os the stream to copy to
*/
public InOutCopier(InputStream is, OutputStream os) throws IOException
{
this.is = new BufferedInputStream(is);
this.os = os;
this.enable = true;
}
/**
* Force close the stream without waiting for EOF on the source
*/
public void close()
{
enable = false;
interrupt();
}
/**
* Flush the outputstream
*/
public void flush() throws IOException
{
os.flush();
}
/** Start the thread and wait to make sure its really started */
public synchronized void start()
{
super.start();
try {
wait();
} catch (InterruptedException Ie) {}
}
/**
* Copies from the inputstream to the outputstream
* until EOF on the inputstream or explicitly closed
* @see #close()
*/
public void run()
{
byte[] buf = new byte[BUFSIZE];
synchronized (this) {
notifyAll();
}
while (enable)
try {
int n = is.read(buf);
if (0 > n)
break;
if (0 < n) {
os.write(buf, 0, (n> BUFSIZE? BUFSIZE:n));
os.flush();
}
} catch (IOException IOe) {
break;
}
try { os.close(); } catch (IOException IOe) {}
}
}
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