95 lines
2.2 KiB
Java
95 lines
2.2 KiB
Java
// PipedOutputStream.java - Write bytes to a pipe.
|
|
|
|
/* Copyright (C) 1998, 1999 Cygnus Solutions
|
|
|
|
This file is part of libgcj.
|
|
|
|
This software is copyrighted work licensed under the terms of the
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
|
details. */
|
|
|
|
package java.io;
|
|
|
|
/**
|
|
* @author Tom Tromey <tromey@cygnus.com>
|
|
* @date September 24, 1998
|
|
*/
|
|
|
|
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
|
|
* "The Java Language Specification", ISBN 0-201-63451-1
|
|
* Status: Believed complete and correct.
|
|
*/
|
|
|
|
public class PipedOutputStream extends OutputStream
|
|
{
|
|
public void close () throws IOException
|
|
{
|
|
closed = true;
|
|
|
|
// Notify PipedInputStream that there is no more data to be had.
|
|
destination.receive(-1);
|
|
}
|
|
|
|
public void connect (PipedInputStream dest) throws IOException
|
|
{
|
|
if (closed)
|
|
throw new IOException("pipe closed");
|
|
|
|
if (destination != null)
|
|
if (destination == dest)
|
|
return;
|
|
else
|
|
throw new IOException("pipe already connected");
|
|
|
|
destination = dest;
|
|
try
|
|
{
|
|
dest.connect(this);
|
|
}
|
|
catch (IOException ex)
|
|
{
|
|
destination = null;
|
|
throw ex;
|
|
}
|
|
}
|
|
|
|
public synchronized void flush () throws IOException
|
|
{
|
|
// There doesn't seem to be anything to do here.
|
|
|
|
// TBD: Should this maybe do a notifyAll as a way for the user
|
|
// to wake up the input stream to check for bytes to read? Shouldn't
|
|
// be necessary but if there aren't any bytes, other threads will just
|
|
// go blocak again anyway so it wouldn't hurt.
|
|
}
|
|
|
|
public PipedOutputStream ()
|
|
{
|
|
closed = false;
|
|
}
|
|
|
|
public PipedOutputStream (PipedInputStream dest) throws IOException
|
|
{
|
|
closed = false;
|
|
connect (dest);
|
|
}
|
|
|
|
public void write (int oneByte) throws IOException
|
|
{
|
|
if (closed)
|
|
throw new IOException ();
|
|
destination.receive(oneByte);
|
|
}
|
|
|
|
// This is mentioned in the JCL book, but we don't really need it.
|
|
// If there were a corresponding receive() method on
|
|
// PipedInputStream then we could get better performance using
|
|
// this.
|
|
// public void write (byte[] buffer, int offset, int count)
|
|
// throws IOException;
|
|
|
|
// Instance variables.
|
|
private PipedInputStream destination;
|
|
private boolean closed;
|
|
}
|