SinkChannelImpl.java :  » 6.0-JDK-Platform » windows » sun » nio » ch » Java Open Source

/*
 * Copyright 2002-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @(#)SinkChannelImpl.java  1.18 07/05/05
 */

package sun.nio.ch;

import java.io.IOException;
import java.io.FileDescriptor;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.nio.channels.spi.*;


/** 
 * Pipe.SinkChannel implementation based on socket connection.
 */

class SinkChannelImpl
    extends Pipe.SinkChannel
    implements SelChImpl
{
    // The SocketChannel assoicated with this pipe
    SocketChannel sc;

    public FileDescriptor getFD() {
  return ((SocketChannelImpl)sc).getFD();
    }

    public int getFDVal() {
  return ((SocketChannelImpl)sc).getFDVal();
    }

    SinkChannelImpl(SelectorProvider sp, SocketChannel sc) {
  super(sp);
  this.sc = sc;
    }

    protected void implCloseSelectableChannel() throws IOException {
  if (!isRegistered())
      kill();
    }

    public void kill() throws IOException {
  sc.close();
    }

    protected void implConfigureBlocking(boolean block) throws IOException {
  sc.configureBlocking(block);
    }

    public boolean translateReadyOps(int ops, int initialOps,
                                     SelectionKeyImpl sk) {
        int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes
        int oldOps = sk.nioReadyOps();
        int newOps = initialOps;

        if ((ops & PollArrayWrapper.POLLNVAL) != 0)
            throw new Error("POLLNVAL detected");

        if ((ops & (PollArrayWrapper.POLLERR
                    | PollArrayWrapper.POLLHUP)) != 0) {
            newOps = intOps;
            sk.nioReadyOps(newOps);
            return (newOps & ~oldOps) != 0;
        }

        if (((ops & PollArrayWrapper.POLLOUT) != 0) &&
            ((intOps & SelectionKey.OP_WRITE) != 0))
            newOps |= SelectionKey.OP_WRITE;

        sk.nioReadyOps(newOps);
        return (newOps & ~oldOps) != 0;
    }

    public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {
        return translateReadyOps(ops, sk.nioReadyOps(), sk);
    }

    public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {
        return translateReadyOps(ops, 0, sk);
    }

    public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) {
        if ((ops & SelectionKey.OP_WRITE) != 0)
            ops = PollArrayWrapper.POLLOUT;
        sk.selector.putEventOps(sk, ops);
    }

    public int write(ByteBuffer src) throws IOException {
  try {
      return sc.write(src);
  } catch (AsynchronousCloseException x) {
      close();
      throw x;
  }
    }

    public long write(ByteBuffer[] srcs) throws IOException {
  try {
      return sc.write(srcs);
  } catch (AsynchronousCloseException x) {
      close();
      throw x;
  }
    }

    public long write(ByteBuffer[] srcs, int offset, int length)
  throws IOException
    {
        if ((offset < 0) || (length < 0) || (offset > srcs.length - length))
           throw new IndexOutOfBoundsException();
  try {
      return write(Util.subsequence(srcs, offset, length));
  } catch (AsynchronousCloseException x) {
      close();
      throw x;
  }
    }
}