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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 org.littleshoot.mina.handler.multiton;

import org.littleshoot.mina.common.IdleStatus;
import org.littleshoot.mina.common.IoHandler;
import org.littleshoot.mina.common.IoSession;

/**
 * An {@link IoHandler} implementation which delegates all requests to
 * {@link SingleSessionIoHandler}s.  A {@link SingleSessionIoHandlerFactory}
 * is used to create a new {@link SingleSessionIoHandler} for each newly
 * created session.
 * 
 * @author The Apache Directory Project ([email protected])
 * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
 */
public class SingleSessionIoHandlerDelegate implements IoHandler {
    /**
     * The key used to store the {@link SingleSessionIoHandler} as a session
     * attribute.
     */
    public static final String HANDLER = SingleSessionIoHandlerDelegate.class
            .getName()
            + ".handler";

    /**
     * The {@link SingleSessionIoHandlerFactory} used to create new
     * {@link SingleSessionIoHandler}s.
     */
    private final SingleSessionIoHandlerFactory factory;

    /**
     * Creates a new instance that uses the passed in
     * {@link SingleSessionIoHandlerFactory} to create new
     * {@link SingleSessionIoHandler}s.
     * 
     * @param factory  the factory for {@link SingleSessionIoHandler}s
     */
    public SingleSessionIoHandlerDelegate(SingleSessionIoHandlerFactory factory) {
        if (factory == null) {
            throw new NullPointerException("factory");
        }
        this.factory = factory;
    }

    /**
     * Creates a new instance with the factory passed to the constructor of
     * this class.  The created handler is stored as a session
     * attribute named {@link #HANDLER}.
     * 
     * @see org.littleshoot.mina.common.IoHandler#sessionCreated(org.littleshoot.mina.common.IoSession)
     */
    public void sessionCreated(IoSession session) throws Exception {
        SingleSessionIoHandler handler = factory.getHandler(session);
        session.setAttribute(HANDLER, handler);
        handler.sessionCreated();
    }

    /**
     * Delegates the method call to the
     * {@link SingleSessionIoHandler#sessionOpened()} method of the handler
     * assigned to this session.
     */
    public void sessionOpened(IoSession session) throws Exception {
        SingleSessionIoHandler handler = (SingleSessionIoHandler) session
                .getAttribute(HANDLER);
        handler.sessionOpened();
    }

    /**
     * Delegates the method call to the
     * {@link SingleSessionIoHandler#sessionClosed()} method of the handler
     * assigned to this session.
     */
    public void sessionClosed(IoSession session) throws Exception {
        SingleSessionIoHandler handler = (SingleSessionIoHandler) session
                .getAttribute(HANDLER);
        handler.sessionClosed();
    }

    /**
     * Delegates the method call to the
     * {@link SingleSessionIoHandler#sessionIdle(IdleStatus)} method of the
     * handler assigned to this session.
     */
    public void sessionIdle(IoSession session, IdleStatus status)
            throws Exception {
        SingleSessionIoHandler handler = (SingleSessionIoHandler) session
                .getAttribute(HANDLER);
        handler.sessionIdle(status);
    }

    /**
     * Delegates the method call to the
     * {@link SingleSessionIoHandler#exceptionCaught(Throwable)} method of the
     * handler assigned to this session.
     */
    public void exceptionCaught(IoSession session, Throwable cause)
            throws Exception {
        SingleSessionIoHandler handler = (SingleSessionIoHandler) session
                .getAttribute(HANDLER);
        handler.exceptionCaught(cause);
    }

    /**
     * Delegates the method call to the
     * {@link SingleSessionIoHandler#messageReceived(Object)} method of the
     * handler assigned to this session.
     */
    public void messageReceived(IoSession session, Object message)
            throws Exception {
        SingleSessionIoHandler handler = (SingleSessionIoHandler) session
                .getAttribute(HANDLER);
        handler.messageReceived(message);
    }

    /**
     * Delegates the method call to the
     * {@link SingleSessionIoHandler#messageSent(Object)} method of the handler
     * assigned to this session.
     */
    public void messageSent(IoSession session, Object message) throws Exception {
        SingleSessionIoHandler handler = (SingleSessionIoHandler) session
                .getAttribute(HANDLER);
        handler.messageSent(message);
    }
}