001// ***************************************************************************************************************************
002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
003// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
005// * with the License.  You may obtain a copy of the License at                                                              *
006// *                                                                                                                         *
007// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
008// *                                                                                                                         *
009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an  *
010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the        *
011// * specific language governing permissions and limitations under the License.                                              *
012// ***************************************************************************************************************************
013package org.apache.juneau.internal;
014
015import java.util.*;
016
017/**
018 * Class-related utility methods.
019 *
020 * <h5 class='section'>See Also:</h5><ul>
021
022 * </ul>
023 */
024public final class ResourceBundleUtils {
025
026   private static final ResourceBundle EMPTY = new ResourceBundle() {
027      @Override
028      protected Object handleGetObject(String key) {
029         return null;
030      }
031      @Override
032      public Enumeration<String> getKeys() {
033         return Collections.emptyEnumeration();
034      }
035   };
036
037   /**
038    * Same as {@link ResourceBundle#getBundle(String, Locale, ClassLoader)} but never throws a {@link MissingResourceException}.
039    *
040    * @param baseName The base name of the resource bundle, a fully qualified class name.
041    * @param locale The locale for which a resource bundle is desired.
042    * @param loader The class loader from which to load the resource bundle.
043    * @return The matching resource bundle, or <jk>null</jk> if it could not be found.
044    */
045   public static ResourceBundle findBundle(String baseName, Locale locale, ClassLoader loader) {
046      try {
047         return ResourceBundle.getBundle(baseName, locale, loader);
048      } catch (MissingResourceException e) {}
049      return null;
050   }
051
052   /**
053    * Returns an empty resource bundle.
054    *
055    * @return An empty resource bundle.
056    */
057   public static ResourceBundle empty() {
058      return EMPTY;
059   }
060}