content: /*****************************************************************
   *   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
   *
   *    https://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.cayenne.util;
  
  import java.util.MissingResourceException;
  import java.util.ResourceBundle;
  
  /**
   * Provides access to various modeler resources (mainly strings) obtained via a
   * ResourceBundle.
   */
  public class LocalizedStringsHandler {
  
      public static final String DEFAULT_MESSAGE_BUNDLE = "org.apache.cayenne.cayenne-strings";
  
      protected static ResourceBundle bundle;
  
      static {
          // "static constructor"
          bundle = getBundle();
      }
  
      /**
       * Returns localized string for the given key.
       */
      public static String getString(String key) {
          if ( bundle == null ) {
              return "";
          }
  
          try {
              return bundle.getString(key);
          } catch (Throwable e) {
              return "";
          }
      }
  
      protected synchronized static ResourceBundle getBundle() {
          if (bundle == null) {
              try {
                  bundle = ResourceBundle.getBundle(DEFAULT_MESSAGE_BUNDLE);
              } catch (MissingResourceException e) {
                  // do not throw Cayenne exceptions, as they rely on
                  // LocalizedStringsHandler, and we can get into infinite loop
                  throw new RuntimeException("Can't load properties: " + DEFAULT_MESSAGE_BUNDLE, e);
              }
          }
          return bundle;
      }
  }