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diff --git a/app/src/main/java/org/apache/commons/net/ProtocolCommandSupport.java b/app/src/main/java/org/apache/commons/net/ProtocolCommandSupport.java
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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 org.apache.commons.net;
+
+import org.apache.commons.net.util.ListenerList;
+
+import java.io.Serializable;
+import java.util.EventListener;
+
+/***
+ * 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.
+ * <p>
+ * <p>
+ * @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.
+     * <p>
+     * @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 org.apache.commons.net.ProtocolCommandListener#protocolCommandSent protocolCommandSent() }
+     *  methods.
+     * <p>
+     * @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 org.apache.commons.net.ProtocolCommandListener#protocolReplyReceived protocolReplyReceived() }
+     *  methods.
+     * <p>
+     * @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.
+     * <p>
+     * @param listener  The ProtocolCommandListener to add.
+     ***/
+    public void addProtocolCommandListener(ProtocolCommandListener listener)
+    {
+        __listeners.addListener(listener);
+    }
+
+    /***
+     * Removes a ProtocolCommandListener.
+     * <p>
+     * @param listener  The ProtocolCommandListener to remove.
+     ***/
+    public void removeProtocolCommandListener(ProtocolCommandListener listener)
+    {
+        __listeners.removeListener(listener);
+    }
+
+
+    /***
+     * Returns the number of ProtocolCommandListeners currently registered.
+     * <p>
+     * @return The number of ProtocolCommandListeners currently registered.
+     ***/
+    public int getListenerCount()
+    {
+        return __listeners.getListenerCount();
+    }
+
+}
+