001/* 002 * Copyright (C) 2008 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.features; 018 019import com.google.common.annotations.GwtCompatible; 020import com.google.common.collect.testing.Helpers; 021import java.lang.annotation.Inherited; 022import java.lang.annotation.Retention; 023import java.lang.annotation.RetentionPolicy; 024import java.util.Set; 025 026/** 027 * Optional features of classes derived from {@code Set}. 028 * 029 * @author George van den Driessche 030 */ 031// Enum values use constructors with generic varargs. 032@SuppressWarnings("unchecked") 033@GwtCompatible 034public enum SetFeature implements Feature<Set> { 035 GENERAL_PURPOSE(CollectionFeature.GENERAL_PURPOSE); 036 037 private final Set<Feature<? super Set>> implied; 038 039 SetFeature(Feature<? super Set>... implied) { 040 this.implied = Helpers.copyToSet(implied); 041 } 042 043 @Override 044 public Set<Feature<? super Set>> getImpliedFeatures() { 045 return implied; 046 } 047 048 @Retention(RetentionPolicy.RUNTIME) 049 @Inherited 050 @TesterAnnotation 051 public @interface Require { 052 public abstract SetFeature[] value() default {}; 053 054 public abstract SetFeature[] absent() default {}; 055 } 056}