Fix for PR java.io/204:
* java/io/PipedInputStream.java, java/io/PipedReader.java, java/io/PipedOutputStream.java, java/io/PipedWriter.java: Imported from Classpath. From-SVN: r33300
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Tom Tromey
Tom Tromey
parent
21caf59006
commit
d3474943bf
5 changed files with 1433 additions and 570 deletions
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@ -1,88 +1,217 @@
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// PipedWriter.java - Piped character stream.
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/* PipedWriter.java -- Write portion of piped streams.
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Copyright (C) 1998 Free Software Foundation, Inc.
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/* Copyright (C) 1998, 1999 Free Software Foundation
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This file is part of GNU Classpath.
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This file is part of libgcj.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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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 25, 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: Complete to 1.1.
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*/
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* This class writes its chars to a <code>PipedReader</code> to
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* which it is connected.
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* <p>
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* It is highly recommended that a <code>PipedWriter</code> and its
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* connected <code>PipedReader</code> be in different threads. If
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* they are in the same thread, read and write operations could deadlock
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* the thread.
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*
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* @version 0.0
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class PipedWriter extends Writer
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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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}
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public void connect (PipedReader sink) throws IOException
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{
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if (closed)
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throw new IOException ("already closed");
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if (reader != null)
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{
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if (reader == sink)
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return;
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throw new IOException ("already connected");
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}
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try
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{
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reader = sink;
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reader.connect(this);
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}
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catch (IOException e)
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{
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reader = null;
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throw e;
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}
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}
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/*************************************************************************/
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public void flush () throws IOException
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{
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// We'll throw an exception if we're closed, but there's nothing
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// else to do here.
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if (closed)
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throw new IOException ("closed");
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}
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/*
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* Instance Variables
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*/
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public PipedWriter ()
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{
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super ();
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closed = false;
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}
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/**
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* This is the <code>PipedReader</code> to which this object
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* is connected.
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*/
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private PipedReader snk;
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public PipedWriter (PipedReader sink) throws IOException
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{
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super ();
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closed = false;
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connect (sink);
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}
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/**
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* This flag indicates whether or not this stream has ever been
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* connected to an input stream
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*/
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private boolean ever_connected;
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public void write (char buffer[], int offset, int count) throws IOException
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{
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if (closed)
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throw new IOException ("closed");
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reader.receive(buffer, offset, count);
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}
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/**
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* This flag indicates whether the <code>close</code> method has ever
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* been called for this stream.
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*/
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private boolean closed;
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boolean isClosed ()
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{
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return closed;
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}
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/*************************************************************************/
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// The associated reader.
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private PipedReader reader;
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private boolean closed;
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/**
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* This method initializes a new <code>PipedWriter</code> instance.
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* This constructor creates an unconnected object. It must be connected
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* to a <code>PipedReader</code> object using the <code>connect</code>
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* method prior to writing any data or an exception will be thrown.
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*/
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public
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PipedWriter()
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{
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; // Do Nothing
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}
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/*************************************************************************/
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/**
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* This method initializes a new <code>PipedWriter</code> instance
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* to write to the specified <code>PipedReader</code>. This stream
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* is then ready for writing.
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*
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* @param snk The <code>PipedReader</code> to connect this stream to.
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*
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* @exception IOException If an error occurs
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*/
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public
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PipedWriter(PipedReader snk) throws IOException
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{
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connect(snk);
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* This method connects this object to the specified
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* <code>PipedReader</code> object. This stream will then be ready
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* for writing. If this stream is already connected or has been
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* previously closed, then an exception is thrown.
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*
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* @param snk The <code>PipedReader</code> to connect this stream to
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*
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* @exception IOException If an error occurs
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*/
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public void
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connect(PipedReader snk) throws IOException
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{
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if (snk == this.snk)
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return;
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if (ever_connected)
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throw new IOException("Already connected");
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if (closed)
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throw new IOException("Stream is closed and cannot be reopened");
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synchronized (lock) {
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this.snk = snk;
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ever_connected = true;
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snk.src = this;
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snk.connect(this);
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} // synchronized
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}
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/*************************************************************************/
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/**
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* This method closes this stream so that no more data can be written
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* to it. Any further attempts to write to this stream may throw an
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* exception
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*
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* @exception IOException If an error occurs
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*/
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public void
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close() throws IOException
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{
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synchronized (lock) {
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closed = true;
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snk.close();
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notifyAll();
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} // synchronized
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}
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/*************************************************************************/
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/**
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* This methods writes a single byte of data to the pipe. This call may
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* block if the pipe is full.
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*
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* @param c The <code>char</code> to write, passed as an <code>int</code>.
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*
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* @exception IOException If an error occurs.
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*/
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public void
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write(int c) throws IOException
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{
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char[] buf = new char[1];
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buf[0] = (char)c;
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write(buf, 0, buf.length);
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}
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/*************************************************************************/
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/**
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* This method writes <code>len</code> chars of data from the char array
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* <code>buf</code> starting at index <code>offset</code> in the array
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* to the stream. Note that this method will block if the
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* <code>PipedReader</code> to which this object is connected has
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* a buffer that cannot hold all of the chars to be written.
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*
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* @param buf The array containing chars to write to thes stream.
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* @param offset The index into the array to start writing chars from.
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* @param len The number of chars to write.
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*
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* @exception IOException If an error occurs
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*/
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public void
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write(char[] buf, int offset, int len) throws IOException
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{
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snk.write(buf, 0, len);
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}
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/*************************************************************************/
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/**
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* This method flushes any unwritten chars to the underlying output
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* sink. This method does nothing in this class because this class does
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* not buffer any chars.
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*
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* @exception IOException If an error occurs
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*/
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public void
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flush() throws IOException
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{
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; // Do Nothing
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}
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} // class PipedWriter
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