com.feilong.lib.net.ProtocolCommandSupport Maven / Gradle / Ivy

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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
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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 com.feilong.lib.net;

import java.io.Serializable;
import java.util.EventListener;

import com.feilong.lib.net.util.ListenerList;

/***
 * ProtocolCommandSupport is a convenience class for managing a list of
 * ProtocolCommandListeners and firing ProtocolCommandEvents. You can
 * simply delegate ProtocolCommandEvent firing and listener
 * registering/unregistering tasks to this class.
 *
 *
 * @see ProtocolCommandEvent
 * @see ProtocolCommandListener
 ***/

public class ProtocolCommandSupport implements Serializable{

    private static final long  serialVersionUID = -8017692739988399978L;

    private final Object       __source;

    private final ListenerList __listeners;

    /***
     * Creates a ProtocolCommandSupport instance using the indicated source
     * as the source of ProtocolCommandEvents.
     *
     * @param source
     *            The source to use for all generated ProtocolCommandEvents.
     ***/
    public ProtocolCommandSupport(Object source){
        __listeners = new ListenerList();
        __source = source;
    }

    /***
     * Fires a ProtocolCommandEvent signalling the sending of a command to all
     * registered listeners, invoking their
     * {@link com.feilong.lib.net.ProtocolCommandListener#protocolCommandSent protocolCommandSent() }
     * methods.
     *
     * @param command
     *            The string representation of the command type sent, not
     *            including the arguments (e.g., "STAT" or "GET").
     * @param message
     *            The entire command string verbatim as sent to the server,
     *            including all arguments.
     ***/
    public void fireCommandSent(String command,String message){
        ProtocolCommandEvent event;

        event = new ProtocolCommandEvent(__source, command, message);

        for (EventListener listener : __listeners){
            ((ProtocolCommandListener) listener).protocolCommandSent(event);
        }
    }

    /***
     * Fires a ProtocolCommandEvent signalling the reception of a command reply
     * to all registered listeners, invoking their
     * {@link com.feilong.lib.net.ProtocolCommandListener#protocolReplyReceived protocolReplyReceived() }
     * methods.
     *
     * @param replyCode
     *            The integer code indicating the natureof the reply.
     *            This will be the protocol integer value for protocols
     *            that use integer reply codes, or the reply class constant
     *            corresponding to the reply for protocols like POP3 that use
     *            strings like OK rather than integer codes (i.e., POP3Repy.OK).
     * @param message
     *            The entire reply as received from the server.
     ***/
    public void fireReplyReceived(int replyCode,String message){
        ProtocolCommandEvent event;
        event = new ProtocolCommandEvent(__source, replyCode, message);

        for (EventListener listener : __listeners){
            ((ProtocolCommandListener) listener).protocolReplyReceived(event);
        }
    }

    /***
     * Adds a ProtocolCommandListener.
     *
     * @param listener
     *            The ProtocolCommandListener to add.
     ***/
    public void addProtocolCommandListener(ProtocolCommandListener listener){
        __listeners.addListener(listener);
    }

    /***
     * Removes a ProtocolCommandListener.
     *
     * @param listener
     *            The ProtocolCommandListener to remove.
     ***/
    public void removeProtocolCommandListener(ProtocolCommandListener listener){
        __listeners.removeListener(listener);
    }

    /***
     * Returns the number of ProtocolCommandListeners currently registered.
     *
     * @return The number of ProtocolCommandListeners currently registered.
     ***/
    public int getListenerCount(){
        return __listeners.getListenerCount();
    }

}