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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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */

package org.apache.http.impl.nio.reactor;

import java.nio.channels.SocketChannel;

import org.apache.http.util.Args;

/**
 * {@link SocketChannel} entry maintained by the I/O reactor. If the channel
 *  represents an outgoing client connection, this entry also contains the
 *  original {@link SessionRequestImpl} used to request it.
 *
 * @since 4.0
 */
public class ChannelEntry {

    private final SocketChannel channel;
    private final SessionRequestImpl sessionRequest;

    /**
     * Creates new ChannelEntry.
     *
     * @param channel the channel
     * @param sessionRequest original session request. Can be {@code null}
     *   if the channel represents an incoming server-side connection.
     */
    public ChannelEntry(final SocketChannel channel, final SessionRequestImpl sessionRequest) {
        super();
        Args.notNull(channel, "Socket channel");
        this.channel = channel;
        this.sessionRequest = sessionRequest;
    }

    /**
     * Creates new ChannelEntry.
     *
     * @param channel the channel.
     */
    public ChannelEntry(final SocketChannel channel) {
        this(channel, null);
    }

    /**
     * Returns the original session request, if available. If the channel
     * entry represents an incoming server-side connection, returns
     * {@code null}.
     *
     * @return the original session request, if client-side channel,
     *  {@code null} otherwise.
     */
    public SessionRequestImpl getSessionRequest() {
        return this.sessionRequest;
    }

    /**
     * Returns the original session request attachment, if available.
     *
     * @return the original session request attachment, if available,
     *  {@code null} otherwise.
     */
    public Object getAttachment() {
        if (this.sessionRequest != null) {
            return this.sessionRequest.getAttachment();
        } else {
            return null;
        }
    }

    /**
     * Returns the channel.
     *
     * @return the channel.
     */
    public SocketChannel getChannel() {
        return this.channel;
    }

}