/* * Copyright (C) 2008 The Android Open Source Project * * Licensed 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.harmony.luni.internal.util; /** * This class provides a way to add an implementation specific way to * access the current timezone. */ public abstract class TimezoneGetter { private static TimezoneGetter instance; /** * Retrieves the singleton instance of this class. * * @return TimezoneGetter the single instance of this class. */ public static TimezoneGetter getInstance() { return instance; } /** * Sets the singleton instance of this class. * * @param instance * TimezoneGetter the single instance of this class. */ public static void setInstance(TimezoneGetter getter) { if (instance != null) { throw new UnsupportedOperationException("TimezoneGetter instance already set"); } instance = getter; } /** * Retrieves the ID of the current time zone. * * @return String the ID of the current time zone. */ public abstract String getId(); }