/*

  * Copyright 2007 the original author or authors.

  * 

  * 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.mockftpserver.core.command;

 import org.mockftpserver.core.util.Assert;

 import java.util.ResourceBundle;

 /**

  * Contains common utility method to conditionally set the reply text ResourceBundle on a

  * CommandHandler instance.

  * 

  * @version $Revision: 184 $ - $Date: 2008-12-03 17:52:39 -0500 (Wed, 03 Dec 2008) $

  *

  * @author Chris Mair

  */

 public final class ReplyTextBundleUtil {

     /**

      * Set the <code>replyTextBundle</code> property of the specified CommandHandler to the 

      * <code>ResourceBundle</code> if and only if the <code>commandHandler</code> implements the 

      * {@link ReplyTextBundleAware} interface AND its <code>replyTextBundle</code> property 

      * has not been set (is null).

      * 

      * @param commandHandler - the CommandHandler instance

      * @param replyTextBundle - the ResourceBundle to use for localizing reply text

      * 

      * @throws org.mockftpserver.core.util.AssertFailedException - if the commandHandler is null

      */

     public static void setReplyTextBundleIfAppropriate(CommandHandler commandHandler, ResourceBundle replyTextBundle) {

         Assert.notNull(commandHandler, "commandHandler");

         if (commandHandler instanceof ReplyTextBundleAware) {

             ReplyTextBundleAware replyTextBundleAware = (ReplyTextBundleAware) commandHandler;

             if (replyTextBundleAware.getReplyTextBundle() == null) {

                 replyTextBundleAware.setReplyTextBundle(replyTextBundle);

             }

         }

     }

 }