1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.vfs2.util;
18
19 import java.text.MessageFormat;
20 import java.util.MissingResourceException;
21 import java.util.ResourceBundle;
22 import java.util.concurrent.ConcurrentHashMap;
23 import java.util.concurrent.ConcurrentMap;
24
25 import org.apache.commons.lang3.ArrayUtils;
26
27 /**
28 * Formats messages.
29 */
30 public final class Messages {
31
32 /**
33 * Map from message code to MessageFormat object for the message.
34 */
35 private static final ConcurrentMap<String, MessageFormat> messageMap = new ConcurrentHashMap<>();
36 private static final ResourceBundle RESOURCES = new CombinedResources("org.apache.commons.vfs2.Resources");
37
38 /**
39 * Locates a message by its code.
40 */
41 private static MessageFormat findMessage(final String code) throws MissingResourceException {
42 // Check if the message is cached
43 return messageMap.computeIfAbsent(code, k -> new MessageFormat(RESOURCES.getString(k)));
44 }
45
46 /**
47 * Formats a message.
48 *
49 * @param code The message code.
50 * @return The formatted message.
51 */
52 public static String getString(final String code) {
53 return getString(code, ArrayUtils.EMPTY_OBJECT_ARRAY);
54 }
55
56 /**
57 * Formats a message.
58 *
59 * @param code The message code.
60 * @param param The message parameter.
61 * @return The formatted message.
62 * @deprecated Will be removed in 3.0 in favor of {@link #getString(String, Object[])} When removed, calls to this
63 * method will automatically recompile to {@link #getString(String, Object[])}
64 */
65 @Deprecated
66 public static String getString(final String code, final Object param) {
67 return getString(code, new Object[] { param });
68 }
69
70 /**
71 * Formats a message.
72 *
73 * @param code The message code.
74 * @param params The message parameters.
75 * @return The formatted message.
76 */
77 public static String getString(final String code, final Object... params) {
78 try {
79 if (code == null) {
80 return null;
81 }
82 return findMessage(code).format(params);
83 } catch (final MissingResourceException mre) {
84 return "Unknown message with code \"" + code + "\".";
85 }
86 }
87
88 private Messages() {
89 // no instances.
90 }
91 }