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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package java.nio.channels;

public abstract class SelectionKey {
	public static final int OP_READ = 1;
	public static final int OP_WRITE = 4;
	public static final int OP_CONNECT = 8;
	public static final int OP_ACCEPT = 16;

	protected SelectionKey() {
	}

	public abstract SelectableChannel channel();

	public abstract Selector selector();

	public abstract boolean isValid();

	public abstract void cancel();

	public abstract int interestOps();

	public abstract SelectionKey interestOps(int ops);

	public abstract int readyOps();

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

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

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

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

	private Object attachment = null;

	synchronized public final Object attach(Object ob) {
		return attachment = ob;
	}

	synchronized public final Object attachment() {
		return attachment;
	}
}