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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      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  */
     16 
     17 package org.apache.harmony.luni.internal.util;
     18 
     19 /**
     20  * This class provides a way to add an implementation specific way to
     21  * access the current timezone.
     22  */
     23 public abstract class TimezoneGetter {
     24 
     25     private static TimezoneGetter instance;
     26 
     27     /**
     28      * Retrieves the singleton instance of this class.
     29      *
     30      * @return TimezoneGetter the single instance of this class.
     31      */
     32     public static TimezoneGetter getInstance() {
     33         return instance;
     34     }
     35 
     36     /**
     37      * Sets the singleton instance of this class.
     38      *
     39      * @param instance
     40      *            TimezoneGetter the single instance of this class.
     41      */
     42     public static void setInstance(TimezoneGetter getter) {
     43         if (instance != null) {
     44             throw new UnsupportedOperationException("TimezoneGetter instance already set");
     45         }
     46         instance = getter;
     47     }
     48 
     49     /**
     50      * Retrieves the ID of the current time zone.
     51      *
     52      * @return String the ID of the current time zone.
     53      */
     54     public abstract String getId();
     55 }
     56