001/* 002 * Copyright (C) 2013 The Guava Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package com.google.common.collect.testing.google; 018 019import static java.util.Collections.emptySet; 020 021import com.google.common.annotations.GwtCompatible; 022import com.google.common.collect.Multiset; 023import com.google.common.collect.testing.features.Feature; 024import com.google.common.collect.testing.features.TesterAnnotation; 025import java.lang.annotation.Inherited; 026import java.lang.annotation.Retention; 027import java.lang.annotation.RetentionPolicy; 028import java.util.Set; 029 030/** 031 * Optional features of classes derived from {@link Multiset}. 032 * 033 * @author Louis Wasserman 034 */ 035@SuppressWarnings("rawtypes") // maybe avoidable if we rework the whole package? 036@GwtCompatible 037public enum MultisetFeature implements Feature<Multiset> { 038 /** 039 * Indicates that elements from {@code Multiset.entrySet()} update to reflect changes in the 040 * backing multiset. 041 */ 042 ENTRIES_ARE_VIEWS; 043 044 @Override 045 public Set<Feature<? super Multiset>> getImpliedFeatures() { 046 return emptySet(); 047 } 048 049 @Retention(RetentionPolicy.RUNTIME) 050 @Inherited 051 @TesterAnnotation 052 public @interface Require { 053 MultisetFeature[] value() default {}; 054 055 MultisetFeature[] absent() default {}; 056 } 057}