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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  
17  package com.google.common.collect.testing.features;
18  
19  import com.google.common.annotations.GwtCompatible;
20  import com.google.common.collect.testing.Helpers;
21  import java.lang.annotation.Inherited;
22  import java.lang.annotation.Retention;
23  import java.lang.annotation.RetentionPolicy;
24  import java.util.Set;
25  
26  /**
27   * Optional features of classes derived from {@code Set}.
28   *
29   * @author George van den Driessche
30   */
31  // Enum values use constructors with generic varargs.
32  @SuppressWarnings("unchecked")
33  @GwtCompatible
34  public enum SetFeature implements Feature<Set> {
35    GENERAL_PURPOSE(CollectionFeature.GENERAL_PURPOSE);
36  
37    private final Set<Feature<? super Set>> implied;
38  
39    SetFeature(Feature<? super Set>... implied) {
40      this.implied = Helpers.copyToSet(implied);
41    }
42  
43    @Override
44    public Set<Feature<? super Set>> getImpliedFeatures() {
45      return implied;
46    }
47  
48    @Retention(RetentionPolicy.RUNTIME)
49    @Inherited
50    @TesterAnnotation
51    public @interface Require {
52      public abstract SetFeature[] value() default {};
53  
54      public abstract SetFeature[] absent() default {};
55    }
56  }