1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/*
* Copyright (C) 2009 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect;
import static com.google.common.base.Preconditions.checkNotNull;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* GWT implementation of {@link ImmutableMap} that forwards to another map.
*
* @author Hayward Chan
*/
public abstract class ForwardingImmutableMap<K, V> extends ImmutableMap<K, V> {
final transient Map<K, V> delegate;
ForwardingImmutableMap(Map<? extends K, ? extends V> delegate) {
this.delegate = Collections.unmodifiableMap(delegate);
}
@SuppressWarnings("unchecked")
ForwardingImmutableMap(Entry<? extends K, ? extends V>... entries) {
Map<K, V> delegate = Maps.newLinkedHashMap();
for (Entry<? extends K, ? extends V> entry : entries) {
K key = checkNotNull(entry.getKey());
V previous = delegate.put(key, checkNotNull(entry.getValue()));
if (previous != null) {
throw new IllegalArgumentException("duplicate key: " + key);
}
}
this.delegate = Collections.unmodifiableMap(delegate);
}
boolean isPartialView() {
return false;
}
public final boolean isEmpty() {
return delegate.isEmpty();
}
public final boolean containsKey(@Nullable Object key) {
return Maps.safeContainsKey(delegate, key);
}
public final boolean containsValue(@Nullable Object value) {
return delegate.containsValue(value);
}
public V get(@Nullable Object key) {
return (key == null) ? null : Maps.safeGet(delegate, key);
}
@Override ImmutableSet<Entry<K, V>> createEntrySet() {
return ImmutableSet.unsafeDelegate(
new ForwardingSet<Entry<K, V>>() {
@Override protected Set<Entry<K, V>> delegate() {
return delegate.entrySet();
}
@Override public boolean contains(Object object) {
if (object instanceof Entry<?, ?>
&& ((Entry<?, ?>) object).getKey() == null) {
return false;
}
try {
return super.contains(object);
} catch (ClassCastException e) {
return false;
}
}
@Override public <T> T[] toArray(T[] array) {
T[] result = super.toArray(array);
if (size() < result.length) {
// It works around a GWT bug where elements after last is not
// properly null'ed.
result[size()] = null;
}
return result;
}
});
}
@Override ImmutableSet<K> createKeySet() {
return ImmutableSet.unsafeDelegate(delegate.keySet());
}
@Override ImmutableCollection<V> createValues() {
return ImmutableCollection.unsafeDelegate(delegate.values());
}
@Override public int size() {
return delegate.size();
}
@Override public boolean equals(@Nullable Object object) {
return delegate.equals(object);
}
@Override public int hashCode() {
return delegate.hashCode();
}
@Override public String toString() {
return delegate.toString();
}
}
|
