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