eaglercraft-1.8/sources/main/java/com/google/common/collect/ImmutableEnumMap.java

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2022-12-25 01:12:28 -08:00
/*
* 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 java.io.Serializable;
import java.util.EnumMap;
import java.util.Iterator;
import javax.annotation.Nullable;
import com.google.common.annotations.GwtCompatible;
/**
* 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
final class ImmutableEnumMap<K extends Enum<K>, V> extends ImmutableMap<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<K, V>(map);
}
}
private transient final EnumMap<K, V> delegate;
private ImmutableEnumMap(EnumMap<K, V> delegate) {
this.delegate = delegate;
checkArgument(!delegate.isEmpty());
}
@Override
ImmutableSet<K> createKeySet() {
return new ImmutableSet<K>() {
@Override
public boolean contains(Object object) {
return delegate.containsKey(object);
}
@Override
public int size() {
return ImmutableEnumMap.this.size();
}
@Override
public UnmodifiableIterator<K> iterator() {
return Iterators.unmodifiableIterator(delegate.keySet().iterator());
}
@Override
boolean isPartialView() {
return true;
}
};
}
@Override
public int size() {
return delegate.size();
}
@Override
public boolean containsKey(@Nullable Object key) {
return delegate.containsKey(key);
}
@Override
public V get(Object key) {
return delegate.get(key);
}
@Override
ImmutableSet<Entry<K, V>> createEntrySet() {
return new ImmutableMapEntrySet<K, V>() {
@Override
ImmutableMap<K, V> map() {
return ImmutableEnumMap.this;
}
@Override
public UnmodifiableIterator<Entry<K, V>> iterator() {
return new UnmodifiableIterator<Entry<K, V>>() {
private final Iterator<Entry<K, V>> backingIterator = delegate.entrySet().iterator();
@Override
public boolean hasNext() {
return backingIterator.hasNext();
}
@Override
public Entry<K, V> next() {
Entry<K, V> entry = backingIterator.next();
return Maps.immutableEntry(entry.getKey(), entry.getValue());
}
};
}
};
}
@Override
boolean isPartialView() {
return false;
}
// All callers of the constructor are restricted to <K extends Enum<K>>.
@Override
Object writeReplace() {
return new EnumSerializedForm<K, V>(delegate);
}
/*
* This class is used to serialize ImmutableEnumSet instances.
*/
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<K, V>(delegate);
}
private static final long serialVersionUID = 0;
}
}