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 17package 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 */ 23public 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