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/* KqueueSelectionKeyImpl.java -- selection key for kqueue/kevent.

   Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 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.nio.channels.SelectableChannel;

import java.nio.channels.SelectionKey;

import java.nio.channels.Selector;

import java.nio.channels.spi.AbstractSelectionKey;

/**

 * @author Casey Marshall (csm@gnu.org)

 */

public class KqueueSelectionKeyImpl extends AbstractSelectionKey

{

  int interestOps;

  int readyOps;

  int activeOps = 0;

  int key;

  int fd;

  /** The selector we were created for. */

  private final KqueueSelectorImpl selector;

  /** The channel we are attached to. */

  private final SelectableChannel channel;

  private final VMChannelOwner natChannel;

  public KqueueSelectionKeyImpl(KqueueSelectorImpl selector,

                                SelectableChannel channel)

  {

    this.selector = selector;

    this.channel = channel;

    natChannel = (VMChannelOwner) channel;

    interestOps = 0;

    readyOps = 0;

  }

  /* (non-Javadoc)

   * @see java.nio.channels.SelectionKey#channel()

   */

  //@Override

  public SelectableChannel channel()

  {

    return channel;

  }

  /* (non-Javadoc)

   * @see java.nio.channels.SelectionKey#interestOps()

   */

  //@Override

  public int interestOps()

  {

    return interestOps;

  }

  /* (non-Javadoc)

   * @see java.nio.channels.SelectionKey#interestOps(int)

   */

  //@Override

  public SelectionKey interestOps(int ops)

  {

    if (!isValid())

      throw new IllegalStateException("key is invalid");

    if ((ops & ~channel.validOps()) != 0)

      throw new IllegalArgumentException("channel does not support all operations");

    selector.setInterestOps(this, ops);

    return this;

  }

  /* (non-Javadoc)

   * @see java.nio.channels.SelectionKey#readyOps()

   */

  //@Override

  public int readyOps()

  {

    return readyOps;

  }

  /* (non-Javadoc)

   * @see java.nio.channels.SelectionKey#selector()

   */

  //@Override

  public Selector selector()

  {

    return selector;

  }

  public String toString()

  {

    if (!isValid())

      return super.toString() + " [ fd: " + fd + " <<invalid>> ]";

    return super.toString() + " [ fd: " + fd + " interest ops: {"

      + ((interestOps & OP_ACCEPT) != 0 ? " OP_ACCEPT" : "")

      + ((interestOps & OP_CONNECT) != 0 ? " OP_CONNECT" : "")

      + ((interestOps & OP_READ) != 0 ? " OP_READ" : "")

      + ((interestOps & OP_WRITE) != 0 ? " OP_WRITE" : "")

      + " }; ready ops: {"

      + ((readyOps & OP_ACCEPT) != 0 ? " OP_ACCEPT" : "")

      + ((readyOps & OP_CONNECT) != 0 ? " OP_CONNECT" : "")

      + ((readyOps & OP_READ) != 0 ? " OP_READ" : "")

      + ((readyOps & OP_WRITE) != 0 ? " OP_WRITE" : "")

      + " } ]";

  }

  public int hashCode()

  {

    return fd;

  }

  public boolean equals(Object o)

  {

    if (!(o instanceof KqueueSelectionKeyImpl))

      return false;

    KqueueSelectionKeyImpl that = (KqueueSelectionKeyImpl) o;

    return that.fd == this.fd && that.channel.equals(this.channel);

  }

  boolean isReadActive()

  {

    return (activeOps & (OP_READ | OP_ACCEPT)) != 0;

  }

  boolean isReadInterested()

  {

    return (interestOps & (OP_READ | OP_ACCEPT)) != 0;

  }

  boolean isWriteActive()

  {

    return (activeOps & (OP_WRITE | OP_CONNECT)) != 0;

  }

  boolean isWriteInterested()

  {

    return (interestOps & (OP_WRITE | OP_CONNECT)) != 0;

  }

  boolean needCommitRead()

  {

    return isReadActive() == (!isReadInterested());

  }

  boolean needCommitWrite()

  {

    return isWriteActive() == (!isWriteInterested());

  }

}