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}