1/*
2 * Copyright (C) 2008 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect.testing.features;
18
19import com.google.common.collect.testing.Helpers;
20
21import java.lang.annotation.Inherited;
22import java.lang.annotation.Retention;
23import java.lang.annotation.RetentionPolicy;
24import java.util.Set;
25
26/**
27 * Optional features of classes derived from {@code Set}.
28 *
29 * <p>This class is GWT compatible.
30 *
31 * @author George van den Driessche
32 */
33// Enum values use constructors with generic varargs.
34@SuppressWarnings("unchecked")
35public enum SetFeature implements Feature<Set> {
36  GENERAL_PURPOSE(
37      CollectionFeature.GENERAL_PURPOSE
38  );
39
40  private final Set<Feature<? super Set>> implied;
41
42  SetFeature(Feature<? super Set> ... implied) {
43    this.implied = Helpers.copyToSet(implied);
44  }
45
46  @Override
47  public Set<Feature<? super Set>> getImpliedFeatures() {
48    return implied;
49  }
50
51  @Retention(RetentionPolicy.RUNTIME)
52  @Inherited
53  @TesterAnnotation
54  public @interface Require {
55    public abstract SetFeature[] value() default {};
56    public abstract SetFeature[] absent() default {};
57  }
58}
59