1090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2009 The Guava Authors 3090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 4090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Licensed under the Apache License, Version 2.0 (the "License"); 5090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * you may not use this file except in compliance with the License. 6090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * You may obtain a copy of the License at 7090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 8090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 9090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 10090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Unless required by applicable law or agreed to in writing, software 11090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 12090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * See the License for the specific language governing permissions and 14090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * limitations under the License. 15090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 16090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 17090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonpackage com.google.common.collect; 18090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 19090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonimport com.google.common.annotations.GwtCompatible; 20090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 21090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/** 22090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Implementation of {@link ImmutableListMultimap} with no entries. 23090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 24090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * @author Mike Ward 25090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 26090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson@GwtCompatible(serializable = true) 27090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonclass EmptyImmutableSetMultimap extends ImmutableSetMultimap<Object, Object> { 28090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson static final EmptyImmutableSetMultimap INSTANCE 29090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson = new EmptyImmutableSetMultimap(); 30090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 31090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson private EmptyImmutableSetMultimap() { 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert super(ImmutableMap.<Object, ImmutableSet<Object>>of(), 0, null); 33090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson } 34090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 35090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson private Object readResolve() { 36090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson return INSTANCE; // preserve singleton property 37090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson } 38090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 39090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson private static final long serialVersionUID = 0; 40090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson} 41