/* SelectionKeyImpl.java -- 
   Copyright (C) 2002, 2003 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
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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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
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package gnu.java.nio;

import java.nio.channels.CancelledKeyException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.spi.AbstractSelectionKey;

public abstract class SelectionKeyImpl extends AbstractSelectionKey
{
  private int readyOps;
  private int interestOps;
  private SelectorImpl impl;
  SelectableChannel ch;

  public SelectionKeyImpl (SelectableChannel ch, SelectorImpl impl)
  {
    this.ch  = ch;
    this.impl = impl;
  }

  public SelectableChannel channel ()
  {
    return ch;
  }

  public int readyOps ()
  {
    if (!isValid())
      throw new CancelledKeyException();
    
    return readyOps;
  }

  public SelectionKey readyOps (int ops)
  {
    if (!isValid())
      throw new CancelledKeyException();
    
    readyOps = ops;
    return this;
  }

  public int interestOps ()
  {
    if (!isValid())
      throw new CancelledKeyException();
    
    return interestOps;    
  }

  public SelectionKey interestOps (int ops)
  {
    if (!isValid())
      throw new CancelledKeyException();
    
    interestOps = ops;
    return this;
  }
    
  public Selector selector ()
  {
    return impl;
  }

  public abstract int getNativeFD();
}