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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat 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.jboss.netty.channel;

import static org.jboss.netty.channel.Channels.*;

/**
 * The default {@link ChildChannelStateEvent} implementation.
 *
 * @author The Netty Project
 * @author Trustin Lee
 *
 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
 *
 */
public class DefaultChildChannelStateEvent implements ChildChannelStateEvent {

    private final Channel parentChannel;
    private final Channel childChannel;

    /**
     * Creates a new instance.
     */
    public DefaultChildChannelStateEvent(Channel parentChannel, Channel childChannel) {
        if (parentChannel == null) {
            throw new NullPointerException("parentChannel");
        }
        if (childChannel == null) {
            throw new NullPointerException("childChannel");
        }
        this.parentChannel = parentChannel;
        this.childChannel = childChannel;
    }

    public Channel getChannel() {
        return parentChannel;
    }

    public ChannelFuture getFuture() {
        return succeededFuture(getChannel());
    }

    public Channel getChildChannel() {
        return childChannel;
    }

    @Override
    public String toString() {
        String channelString = getChannel().toString();
        StringBuilder buf = new StringBuilder(channelString.length() + 32);
        buf.append(channelString);
        buf.append(getChildChannel().isOpen()? " CHILD_OPEN: " : " CHILD_CLOSED: ");
        buf.append(getChildChannel().getId());
        return buf.toString();
    }
}