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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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 java.net.SocketAddress;

import org.jboss.netty.util.internal.StringUtil;

/**
 * The default downstream {@link MessageEvent} implementation.
 */
public class DownstreamMessageEvent implements MessageEvent {

    private final Channel channel;
    private final ChannelFuture future;
    private final Object message;
    private final SocketAddress remoteAddress;

    /**
     * Creates a new instance.
     */
    public DownstreamMessageEvent(
            Channel channel, ChannelFuture future,
            Object message, SocketAddress remoteAddress) {

        if (channel == null) {
            throw new NullPointerException("channel");
        }
        if (future == null) {
            throw new NullPointerException("future");
        }
        if (message == null) {
            throw new NullPointerException("message");
        }
        this.channel = channel;
        this.future = future;
        this.message = message;
        if (remoteAddress != null) {
            this.remoteAddress = remoteAddress;
        } else {
            this.remoteAddress = channel.getRemoteAddress();
        }
    }

    public Channel getChannel() {
        return channel;
    }

    public ChannelFuture getFuture() {
        return future;
    }

    public Object getMessage() {
        return message;
    }

    public SocketAddress getRemoteAddress() {
        return remoteAddress;
    }

    @Override
    public String toString() {
        if (getRemoteAddress() == getChannel().getRemoteAddress()) {
            return getChannel().toString() + " WRITE: " +
                   StringUtil.stripControlCharacters(getMessage());
        } else {
            return getChannel().toString() + " WRITE: " +
                   StringUtil.stripControlCharacters(getMessage()) + " to " +
                   getRemoteAddress();
        }
    }
}