com.facebook.presto.jdbc.internal.guava.collect.ImmutableEnumMap Maven / Gradle / Ivy
/*
* 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.facebook.presto.jdbc.internal.guava.collect;
import static com.facebook.presto.jdbc.internal.guava.base.Preconditions.checkArgument;
import com.facebook.presto.jdbc.internal.guava.annotations.GwtCompatible;
import com.facebook.presto.jdbc.internal.guava.collect.ImmutableMap.IteratorBasedImmutableMap;
import java.io.Serializable;
import java.util.EnumMap;
import java.util.Spliterator;
import java.util.function.BiConsumer;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* 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, 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(@Nullable Object key) {
return delegate.containsKey(key);
}
@Override
public V get(Object key) {
return delegate.get(key);
}
@Override
public boolean equals(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;
}
}
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