| /* |
| * 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.hadoop.mapreduce.util; |
| |
| import java.util.Locale; |
| import java.util.ResourceBundle; |
| import java.util.MissingResourceException; |
| |
| /** |
| * Helper class to handle resource bundles in a saner way |
| */ |
| public class ResourceBundles { |
| |
| /** |
| * Get a resource bundle |
| * @param bundleName of the resource |
| * @return the resource bundle |
| * @throws MissingResourceException |
| */ |
| public static ResourceBundle getBundle(String bundleName) { |
| return ResourceBundle.getBundle(bundleName.replace('$', '_'), |
| Locale.getDefault(), Thread.currentThread().getContextClassLoader()); |
| } |
| |
| /** |
| * Get a resource given bundle name and key |
| * @param <T> type of the resource |
| * @param bundleName name of the resource bundle |
| * @param key to lookup the resource |
| * @param suffix for the key to lookup |
| * @param defaultValue of the resource |
| * @return the resource or the defaultValue |
| * @throws ClassCastException if the resource found doesn't match T |
| */ |
| @SuppressWarnings("unchecked") |
| public static synchronized <T> T getValue(String bundleName, String key, |
| String suffix, T defaultValue) { |
| T value; |
| try { |
| ResourceBundle bundle = getBundle(bundleName); |
| value = (T) bundle.getObject(getLookupKey(key, suffix)); |
| } |
| catch (Exception e) { |
| return defaultValue; |
| } |
| return value; |
| } |
| |
| private static String getLookupKey(String key, String suffix) { |
| if (suffix == null || suffix.isEmpty()) return key; |
| return key + suffix; |
| } |
| |
| /** |
| * Get the counter group display name |
| * @param group the group name to lookup |
| * @param defaultValue of the group |
| * @return the group display name |
| */ |
| public static String getCounterGroupName(String group, String defaultValue) { |
| return getValue(group, "CounterGroupName", "", defaultValue); |
| } |
| |
| /** |
| * Get the counter display name |
| * @param group the counter group name for the counter |
| * @param counter the counter name to lookup |
| * @param defaultValue of the counter |
| * @return the counter display name |
| */ |
| public static String getCounterName(String group, String counter, |
| String defaultValue) { |
| return getValue(group, counter, ".name", defaultValue); |
| } |
| } |