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@SuppressWarnings("rawtypes") // maybe avoidable if we rework the whole package?
032@GwtCompatible
033public enum SetFeature implements Feature<Set> {
034  GENERAL_PURPOSE(CollectionFeature.GENERAL_PURPOSE);
035
036  private final Set<Feature<? super Set>> implied;
037
038  SetFeature(Feature<? super Set>... implied) {
039    this.implied = Helpers.copyToSet(implied);
040  }
041
042  @Override
043  public Set<Feature<? super Set>> getImpliedFeatures() {
044    return implied;
045  }
046
047  @Retention(RetentionPolicy.RUNTIME)
048  @Inherited
049  @TesterAnnotation
050  public @interface Require {
051    public abstract SetFeature[] value() default {};
052
053    public abstract SetFeature[] absent() default {};
054  }
055}