Coverage Summary for Class: AbstractMapEntry (com.google.common.collect)

1 /*
2  * Copyright (C) 2007 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 com.google.common.base.Objects;
21 import java.util.Map.Entry;
22 import org.checkerframework.checker.nullness.qual.Nullable;
23 
24 /**
25  * Implementation of the {@code equals}, {@code hashCode}, and {@code toString} methods of {@code
26  * Entry}.
27  *
28  * @author Jared Levy
29  */
30 @GwtCompatible
31 abstract class AbstractMapEntry<K, V> implements Entry<K, V> {
32 
33   @Override
34   public abstract K getKey();
35 
36   @Override
37   public abstract V getValue();
38 
39   @Override
40   public V setValue(V value) {
41     throw new UnsupportedOperationException();
42   }
43 
44   @Override
45   public boolean equals(@Nullable Object object) {
46     if (object instanceof Entry) {
47       Entry<?, ?> that = (Entry<?, ?>) object;
48       return Objects.equal(this.getKey(), that.getKey())
49           && Objects.equal(this.getValue(), that.getValue());
50     }
51     return false;
52   }
53 
54   @Override
55   public int hashCode() {
56     K k = getKey();
57     V v = getValue();
58     return ((k == null) ? 0 : k.hashCode()) ^ ((v == null) ? 0 : v.hashCode());
59   }
60 
61   /** Returns a string representation of the form {@code {key}={value}}. */
62   @Override
63   public String toString() {
64     return getKey() + "=" + getValue();
65   }
66 }