/* Copyright (c) 2008-2009, Avian Contributors

   Permission to use, copy, modify, and/or distribute this software
   for any purpose with or without fee is hereby granted, provided
   that the above copyright notice and this permission notice appear
   in all copies.

   There is NO WARRANTY for this software.  See license.txt for
   details. */

package java.nio.channels;

public class SelectionKey {
  public static final int OP_READ = 1 << 0;
  public static final int OP_WRITE = 1 << 2;
  public static final int OP_CONNECT = 1 << 3;
  public static final int OP_ACCEPT = 1 << 4;

  private final SelectableChannel channel;
  private final Selector selector;
  private int interestOps;
  private int readyOps;
  private final Object attachment;

  public SelectionKey(SelectableChannel channel, Selector selector,
                      int interestOps, Object attachment)
  {
    this.channel = channel;
    this.selector = selector;
    this.interestOps = interestOps;
    this.attachment = attachment;
    this.readyOps = 0;
  }

  public int interestOps() {
    return interestOps;
  }

  public SelectionKey interestOps(int v) {
    this.interestOps = v;
    return this;
  }

  public int readyOps() {
    return readyOps;
  }

  public void readyOps(int v) {
    this.readyOps = v;
  }

  public boolean isReadable() {
    return (readyOps & OP_READ) != 0;
  }

  public boolean isWritable() {
    return (readyOps & OP_WRITE) != 0;
  }

  public boolean isConnectable() {
    return (readyOps & OP_CONNECT) != 0;
  }

  public boolean isAcceptable() {
    return (readyOps & OP_ACCEPT) != 0;
  }

  public boolean isValid() {
    return channel.isOpen() && selector.isOpen();
  }

  public SelectableChannel channel() {
    return channel;
  }

  public Selector selector() {
    return selector;
  }

  public Object attachment() {
    return attachment;
  }
}