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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (C) 2012 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.checkArgument;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.ImmutableMap.IteratorBasedImmutableMap;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.util.EnumMap;
import java.util.Spliterator;
import java.util.function.BiConsumer;
import javax.annotation.CheckForNull;
/**
* Implementation of {@link ImmutableMap} backed by a non-empty {@link java.util.EnumMap}.
*
* @author Louis Wasserman
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial") // we're overriding default serialization
@ElementTypesAreNonnullByDefault
final class ImmutableEnumMap<K extends Enum<K>, V> extends IteratorBasedImmutableMap<K, V> {
static <K extends Enum<K>, V> ImmutableMap<K, V> asImmutable(EnumMap<K, V> map) {
switch (map.size()) {
case 0:
return ImmutableMap.of();
case 1:
Entry<K, V> entry = Iterables.getOnlyElement(map.entrySet());
return ImmutableMap.of(entry.getKey(), entry.getValue());
default:
return new ImmutableEnumMap<>(map);
}
}
private final transient EnumMap<K, V> delegate;
private ImmutableEnumMap(EnumMap<K, V> delegate) {
this.delegate = delegate;
checkArgument(!delegate.isEmpty());
}
@Override
UnmodifiableIterator<K> keyIterator() {
return Iterators.unmodifiableIterator(delegate.keySet().iterator());
}
@Override
Spliterator<K> keySpliterator() {
return delegate.keySet().spliterator();
}
@Override
public int size() {
return delegate.size();
}
@Override
public boolean containsKey(@CheckForNull Object key) {
return delegate.containsKey(key);
}
@Override
@CheckForNull
public V get(@CheckForNull Object key) {
return delegate.get(key);
}
@Override
public boolean equals(@CheckForNull Object object) {
if (object == this) {
return true;
}
if (object instanceof ImmutableEnumMap) {
object = ((ImmutableEnumMap<?, ?>) object).delegate;
}
return delegate.equals(object);
}
@Override
UnmodifiableIterator<Entry<K, V>> entryIterator() {
return Maps.unmodifiableEntryIterator(delegate.entrySet().iterator());
}
@Override
Spliterator<Entry<K, V>> entrySpliterator() {
return CollectSpliterators.map(delegate.entrySet().spliterator(), Maps::unmodifiableEntry);
}
@Override
public void forEach(BiConsumer<? super K, ? super V> action) {
delegate.forEach(action);
}
@Override
boolean isPartialView() {
return false;
}
// All callers of the constructor are restricted to <K extends Enum<K>>.
@Override
@J2ktIncompatible // serialization
Object writeReplace() {
return new EnumSerializedForm<>(delegate);
}
@J2ktIncompatible // serialization
private void readObject(ObjectInputStream stream) throws InvalidObjectException {
throw new InvalidObjectException("Use EnumSerializedForm");
}
/*
* This class is used to serialize ImmutableEnumMap instances.
*/
@J2ktIncompatible // serialization
private static class EnumSerializedForm<K extends Enum<K>, V> implements Serializable {
final EnumMap<K, V> delegate;
EnumSerializedForm(EnumMap<K, V> delegate) {
this.delegate = delegate;
}
Object readResolve() {
return new ImmutableEnumMap<>(delegate);
}
private static final long serialVersionUID = 0;
}
}
|
