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 com.google.common.annotations.GwtCompatible; 020import com.google.common.collect.Multiset; 021import com.google.common.collect.testing.features.Feature; 022import com.google.common.collect.testing.features.TesterAnnotation; 023import java.lang.annotation.Inherited; 024import java.lang.annotation.Retention; 025import java.lang.annotation.RetentionPolicy; 026import java.util.Collections; 027import java.util.Set; 028 029/** 030 * Optional features of classes derived from {@link Multiset}. 031 * 032 * @author Louis Wasserman 033 */ 034@GwtCompatible 035public enum MultisetFeature implements Feature<Multiset> { 036 /** 037 * Indicates that elements from {@code Multiset.entrySet()} update to reflect changes in the 038 * backing multiset. 039 */ 040 ENTRIES_ARE_VIEWS; 041 042 @Override 043 public Set<Feature<? super Multiset>> getImpliedFeatures() { 044 return Collections.emptySet(); 045 } 046 047 @Retention(RetentionPolicy.RUNTIME) 048 @Inherited 049 @TesterAnnotation 050 public @interface Require { 051 public abstract MultisetFeature[] value() default {}; 052 053 public abstract MultisetFeature[] absent() default {}; 054 } 055}