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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;
18  
19  import com.google.common.annotations.GwtCompatible;
20  import java.io.Serializable;
21  import javax.annotation.Nullable;
22  
23  /**
24   * @see com.google.common.collect.Maps#immutableEntry(Object, Object)
25   */
26  @GwtCompatible(serializable = true)
27  class ImmutableEntry<K, V> extends AbstractMapEntry<K, V> implements Serializable {
28    final K key;
29    final V value;
30  
31    ImmutableEntry(@Nullable K key, @Nullable V value) {
32      this.key = key;
33      this.value = value;
34    }
35  
36    @Nullable
37    @Override
38    public final K getKey() {
39      return key;
40    }
41  
42    @Nullable
43    @Override
44    public final V getValue() {
45      return value;
46    }
47  
48    @Override
49    public final V setValue(V value) {
50      throw new UnsupportedOperationException();
51    }
52  
53    private static final long serialVersionUID = 0;
54  }