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The source code

/*
 * Copyright 2001-2004 The Apache Software Foundation
 *
 * Licensed 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.apache.commons.net;
import java.io.Serializable;
import java.util.Enumeration;
import org.apache.commons.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 * @author Daniel F. Savarese ***/ public class ProtocolCommandSupport implements Serializable { private Object __source; private ListenerList __listeners; /*** * Creates a ProtocolCommandSupport instant using the indicated source * as the source of fired 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 * * 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) { Enumeration enum; ProtocolCommandEvent event; ProtocolCommandListener listener; enum = __listeners.getListeners(); event = new ProtocolCommandEvent(__source, command, message); while (enum.hasMoreElements()) { listener = (ProtocolCommandListener)enum.nextElement(); listener.protocolCommandSent(event); } } /*** * Fires a ProtocolCommandEvent signalling the reception of a command reply * to all registered listeners, invoking their * * 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) { Enumeration enum; ProtocolCommandEvent event; ProtocolCommandListener listener; enum = __listeners.getListeners(); event = new ProtocolCommandEvent(__source, replyCode, message); while (enum.hasMoreElements()) { listener = (ProtocolCommandListener)enum.nextElement(); 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(); } }

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