/* PipeImpl.java -- 
   Copyright (C) 2002, 2003, 2004  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package gnu.java.nio;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Pipe;
import java.nio.channels.spi.SelectorProvider;

class PipeImpl extends Pipe
{
  public static final class SourceChannelImpl extends Pipe.SourceChannel
  {

    private int native_fd;

    private boolean blocking;
    
    public SourceChannelImpl (SelectorProvider selectorProvider,
                              int native_fd)
    {
      super (selectorProvider);
      this.native_fd = native_fd;
    }

    protected final void implCloseSelectableChannel()
      throws IOException
    {
        int fd;
        synchronized(this) {
	    if (native_fd == -1) 
		throw new IOException("Pipe closed twice!");
            fd = native_fd;
            native_fd = -1;
	}
	implClose(fd);
    }

    private final native void implClose(int fd)
	throws IOException;

    protected void implConfigureBlocking (boolean blocking)
      throws IOException
    {
      this.blocking = blocking;	
    }

    public final int read (ByteBuffer src)
      throws IOException
    {
      return readImpl(native_fd,
		      blocking,
		      src.array(),
                      src.position(),
		      src.remaining());
    }

    private native int readImpl(int fd,
                                boolean blocking,
				byte[] dst,
				int off,
				int len);

    public final long read (ByteBuffer[] srcs)
      throws IOException
    {
      return read (srcs, 0, srcs.length);
    }

    public synchronized final long read (ByteBuffer[] srcs, int offset, int len)
      throws IOException
    {
      if (offset < 0
	  || offset > srcs.length
	  || len < 0
	  || len > srcs.length - offset)
	throw new IndexOutOfBoundsException();

      long bytesRead = 0;
      
      for (int index = 0; index < len; index++)
	bytesRead += read (srcs [offset + index]);

      return bytesRead;

    }

  }

  public static final class SinkChannelImpl extends Pipe.SinkChannel
  {
    private int native_fd;
    
    private boolean blocking;

    public SinkChannelImpl (SelectorProvider selectorProvider,
                            int native_fd)
    {
      super (selectorProvider);
      this.native_fd = native_fd;
    }

    protected final void implCloseSelectableChannel()
      throws IOException
    {
        int fd;
        synchronized(this) {
	    if (native_fd == -1) 
		throw new IOException("Pipe closed twice!");
            fd = native_fd;
            native_fd = -1;
	}
	implClose(fd);
    }

    private final native void implClose(int fd)
	throws IOException;

    protected final void implConfigureBlocking (boolean blocking)
      throws IOException
    {
      this.blocking = blocking;
    }

    public final int write(ByteBuffer src)
      throws IOException
    {
      return writeImpl(native_fd,
		       blocking,
		       src.array(),
		       src.position(),
		       src.remaining());
    }

    private native int writeImpl(int fd,
				 boolean blocking,
				 byte[] dst,
				 int off,
				 int len);


    public final long write (ByteBuffer[] srcs)
      throws IOException
    {
      return write (srcs, 0, srcs.length);
    }

    public synchronized final long write (ByteBuffer[] srcs, int offset, int len)
      throws IOException
    {
      if (offset < 0
	  || offset > srcs.length
	  || len < 0
	  || len > srcs.length - offset)
	throw new IndexOutOfBoundsException();

      long bytesWritten = 0;
      
      for (int index = 0; index < len; index++)
	bytesWritten += write (srcs [offset + index]);

      return bytesWritten;
    }

  }

  SinkChannelImpl sink;
  SourceChannelImpl source;
  
  public PipeImpl (SelectorProvider provider)
    throws IOException
  {
    super();
    nativeInit (provider);
  }

  private native void nativeInit (SelectorProvider provider)
    throws IOException;
    
  public Pipe.SinkChannel sink()
  {
    return sink;
  }

  public Pipe.SourceChannel source()
  {
    return source;
  }
}
