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1   /*
2    * Copyright (C) 2013 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.google;
18  
19  import com.google.common.annotations.GwtCompatible;
20  import com.google.common.collect.Multiset;
21  import com.google.common.collect.testing.features.Feature;
22  import com.google.common.collect.testing.features.TesterAnnotation;
23  import java.lang.annotation.Inherited;
24  import java.lang.annotation.Retention;
25  import java.lang.annotation.RetentionPolicy;
26  import java.util.Collections;
27  import java.util.Set;
28  
29  /**
30   * Optional features of classes derived from {@link Multiset}.
31   *
32   * @author Louis Wasserman
33   */
34  @GwtCompatible
35  public enum MultisetFeature implements Feature<Multiset> {
36    /**
37     * Indicates that elements from {@code Multiset.entrySet()} update to reflect changes in the
38     * backing multiset.
39     */
40    ENTRIES_ARE_VIEWS;
41  
42    @Override
43    public Set<Feature<? super Multiset>> getImpliedFeatures() {
44      return Collections.emptySet();
45    }
46  
47    @Retention(RetentionPolicy.RUNTIME)
48    @Inherited
49    @TesterAnnotation
50    public @interface Require {
51      public abstract MultisetFeature[] value() default {};
52  
53      public abstract MultisetFeature[] absent() default {};
54    }
55  }