1/*
2 * Copyright 2007 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package org.mockftpserver.core.command;
17
18import org.mockftpserver.core.util.Assert;
19
20import java.util.ResourceBundle;
21
22/**
23 * Contains common utility method to conditionally set the reply text ResourceBundle on a
24 * CommandHandler instance.
25 *
26 * @version $Revision$ - $Date$
27 *
28 * @author Chris Mair
29 */
30public final class ReplyTextBundleUtil {
31
32    /**
33     * Set the <code>replyTextBundle</code> property of the specified CommandHandler to the
34     * <code>ResourceBundle</code> if and only if the <code>commandHandler</code> implements the
35     * {@link ReplyTextBundleAware} interface AND its <code>replyTextBundle</code> property
36     * has not been set (is null).
37     *
38     * @param commandHandler - the CommandHandler instance
39     * @param replyTextBundle - the ResourceBundle to use for localizing reply text
40     *
41     * @throws org.mockftpserver.core.util.AssertFailedException - if the commandHandler is null
42     */
43    public static void setReplyTextBundleIfAppropriate(CommandHandler commandHandler, ResourceBundle replyTextBundle) {
44        Assert.notNull(commandHandler, "commandHandler");
45        if (commandHandler instanceof ReplyTextBundleAware) {
46            ReplyTextBundleAware replyTextBundleAware = (ReplyTextBundleAware) commandHandler;
47            if (replyTextBundleAware.getReplyTextBundle() == null) {
48                replyTextBundleAware.setReplyTextBundle(replyTextBundle);
49            }
50        }
51    }
52
53}
54