277 lines
6.9 KiB
C#
277 lines
6.9 KiB
C#
using System;
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using System.IO;
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using System.Runtime.CompilerServices;
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namespace Tamir.Streams
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{
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/*
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* @(#)PipedOutputStream.java 1.26 03/12/19
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*
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* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
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* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/**
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* A piped output stream can be connected to a piped input stream
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* to create a communications pipe. The piped output stream is the
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* sending end of the pipe. Typically, data is written to a
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* <code>PipedOutputStream</code> object by one thread and data is
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* read from the connected <code>PipedInputStream</code> by some
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* other thread. Attempting to use both objects from a single thread
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* is not recommended as it may deadlock the thread.
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*
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* @author James Gosling
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* @version 1.26, 12/19/03
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* @see java.io.PipedInputStream
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* @since JDK1.0
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*/
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public class PipedOutputStream : Tamir.SharpSsh.java.io.OutputStream
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{
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/* REMIND: identification of the read and write sides needs to be
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more sophisticated. Either using thread groups (but what about
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pipes within a thread?) or using finalization (but it may be a
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long time until the next GC). */
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private PipedInputStream sink;
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/**
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* Creates a piped output stream connected to the specified piped
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* input stream. Data bytes written to this stream will then be
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* available as input from <code>snk</code>.
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*
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* @param snk The piped input stream to connect to.
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* @exception IOException if an I/O error occurs.
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*/
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public PipedOutputStream(PipedInputStream snk)
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{
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connect(snk);
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}
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/**
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* Creates a piped output stream that is not yet connected to a
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* piped input stream. It must be connected to a piped input stream,
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* either by the receiver or the sender, before being used.
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*
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* @see java.io.PipedInputStream#connect(java.io.PipedOutputStream)
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* @see java.io.PipedOutputStream#connect(java.io.PipedInputStream)
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*/
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public PipedOutputStream()
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{
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}
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/**
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* Connects this piped output stream to a receiver. If this object
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* is already connected to some other piped input stream, an
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* <code>IOException</code> is thrown.
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* <p>
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* If <code>snk</code> is an unconnected piped input stream and
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* <code>src</code> is an unconnected piped output stream, they may
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* be connected by either the call:
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* <blockquote><pre>
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* src.connect(snk)</pre></blockquote>
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* or the call:
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* <blockquote><pre>
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* snk.connect(src)</pre></blockquote>
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* The two calls have the same effect.
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*
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* @param snk the piped input stream to connect to.
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* @exception IOException if an I/O error occurs.
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*/
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[MethodImpl(MethodImplOptions.Synchronized)]
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public virtual void connect(PipedInputStream snk)
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{
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if (snk == null)
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{
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throw new NullReferenceException();
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}
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else if (sink != null || snk.connected)
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{
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throw new IOException("Already connected");
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}
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sink = snk;
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snk.m_in = -1;
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snk.m_out = 0;
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snk.connected = true;
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int t=0;
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}
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/**
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* Writes the specified <code>byte</code> to the piped output stream.
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* If a thread was reading data bytes from the connected piped input
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* stream, but the thread is no longer alive, then an
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* <code>IOException</code> is thrown.
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* <p>
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* Implements the <code>write</code> method of <code>OutputStream</code>.
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*
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* @param b the <code>byte</code> to be written.
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* @exception IOException if an I/O error occurs.
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*/
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public virtual void write(int b)
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{
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if (sink == null)
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{
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throw new IOException("Pipe not connected");
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}
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sink.receive(b);
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}
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/**
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* Writes <code>len</code> bytes from the specified byte array
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* starting at offset <code>off</code> to this piped output stream.
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* If a thread was reading data bytes from the connected piped input
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* stream, but the thread is no longer alive, then an
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* <code>IOException</code> is thrown.
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*
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* @param b the data.
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* @param off the start offset in the data.
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* @param len the number of bytes to write.
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* @exception IOException if an I/O error occurs.
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*/
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public override void write(byte[] b, int off, int len)
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{
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if (sink == null)
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{
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throw new IOException("Pipe not connected");
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}
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else if (b == null)
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{
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throw new NullReferenceException();
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}
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else if ((off < 0) || (off > b.Length) || (len < 0) ||
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((off + len) > b.Length) || ((off + len) < 0))
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{
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throw new IndexOutOfRangeException();
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}
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else if (len == 0)
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{
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return;
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}
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sink.receive(b, off, len);
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}
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public virtual void write(byte[] b)
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{
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write(b, 0, b.Length);
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}
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/**
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* Flushes this output stream and forces any buffered output bytes
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* to be written out.
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* This will notify any readers that bytes are waiting in the pipe.
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*
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* @exception IOException if an I/O error occurs.
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*/
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[MethodImpl(MethodImplOptions.Synchronized)]
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public override void flush()
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{
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if (sink != null)
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{
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lock (sink)
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{
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//sink.notifyAll();
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System.Threading.Monitor.PulseAll(sink);
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}
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}
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}
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/**
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* Closes this piped output stream and releases any system resources
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* associated with this stream. This stream may no longer be used for
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* writing bytes.
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*
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* @exception IOException if an I/O error occurs.
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*/
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public override void close()
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{
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if (sink != null)
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{
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sink.receivedLast();
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}
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}
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///////////////////////////////////////
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public override int Read(byte[] buffer, int offset, int count)
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{
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return 0;
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}
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public override int ReadByte()
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{
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return 0;
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}
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public override void WriteByte(byte value)
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{
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this.write(value);
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}
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public override void Write(byte[] buffer, int offset, int count)
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{
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this.write(buffer, offset, count);
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}
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public virtual void Write(byte[] buffer)
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{
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this.Write(buffer, 0, buffer.Length);
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}
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public override void Close()
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{
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base.Close ();
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this.close();
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}
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public override bool CanRead
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{
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get
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{
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return false;
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}
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}
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public override bool CanWrite
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{
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get
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{
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return true;
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}
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}
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public override bool CanSeek
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{
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get
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{
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return false;
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}
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}
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public override void Flush()
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{
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this.flush();
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}
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public override long Length
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{
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get
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{
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return sink.Length;
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}
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}
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public override long Position
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{
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get
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{
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return sink.m_in;
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}
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set
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{
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throw new IOException("Setting the position of this stream is not supported");
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}
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}
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public override void SetLength(long value)
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{
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throw new IOException("Setting the length of this stream is not supported");
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}
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public override long Seek(long offset, SeekOrigin origin)
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{
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return 0;
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}
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}
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}
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