com.google.common.collect.ImmutableEnumMap Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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.collect.ImmutableMap.IteratorBasedImmutableMap;
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, V> extends IteratorBasedImmutableMap {
static , V> ImmutableMap asImmutable(EnumMap map) {
switch (map.size()) {
case 0:
return ImmutableMap.of();
case 1:
Entry entry = Iterables.getOnlyElement(map.entrySet());
return ImmutableMap.of(entry.getKey(), entry.getValue());
default:
return new ImmutableEnumMap<>(map);
}
}
private final transient EnumMap delegate;
private ImmutableEnumMap(EnumMap delegate) {
this.delegate = delegate;
checkArgument(!delegate.isEmpty());
}
@Override
UnmodifiableIterator keyIterator() {
return Iterators.unmodifiableIterator(delegate.keySet().iterator());
}
@Override
Spliterator 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> entryIterator() {
return Maps.unmodifiableEntryIterator(delegate.entrySet().iterator());
}
@Override
Spliterator> 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 >.
@Override
Object writeReplace() {
return new EnumSerializedForm<>(delegate);
}
/*
* This class is used to serialize ImmutableEnumMap instances.
*/
private static class EnumSerializedForm, V> implements Serializable {
final EnumMap delegate;
EnumSerializedForm(EnumMap delegate) {
this.delegate = delegate;
}
Object readResolve() {
return new ImmutableEnumMap<>(delegate);
}
private static final long serialVersionUID = 0;
}
}