com.facebook.presto.jdbc.internal.guava.collect.JdkBackedImmutableMap Maven / Gradle / Ivy
/*
* Copyright (C) 2018 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.checkNotNull;
import static com.facebook.presto.jdbc.internal.guava.collect.RegularImmutableMap.makeImmutable;
import com.facebook.presto.jdbc.internal.guava.annotations.GwtCompatible;
import java.util.Map;
import java.util.function.BiConsumer;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Implementation of ImmutableMap backed by a JDK HashMap, which has smartness protecting against
* hash flooding.
*/
@GwtCompatible(emulated = true)
final class JdkBackedImmutableMap extends ImmutableMap {
/**
* Creates an {@code ImmutableMap} backed by a JDK HashMap. Used when probable hash flooding is
* detected. This implementation may replace the entries in entryArray with its own entry objects
* (though they will have the same key/value contents), and will take ownership of entryArray.
*/
static ImmutableMap create(int n, Entry[] entryArray) {
Map delegateMap = Maps.newHashMapWithExpectedSize(n);
for (int i = 0; i < n; i++) {
entryArray[i] = makeImmutable(entryArray[i]);
V oldValue = delegateMap.putIfAbsent(entryArray[i].getKey(), entryArray[i].getValue());
if (oldValue != null) {
throw conflictException("key", entryArray[i], entryArray[i].getKey() + "=" + oldValue);
}
}
return new JdkBackedImmutableMap<>(delegateMap, ImmutableList.asImmutableList(entryArray, n));
}
private final transient Map delegateMap;
private final transient ImmutableList> entries;
JdkBackedImmutableMap(Map delegateMap, ImmutableList> entries) {
this.delegateMap = delegateMap;
this.entries = entries;
}
@Override
public int size() {
return entries.size();
}
@Override
public V get(@Nullable Object key) {
return delegateMap.get(key);
}
@Override
ImmutableSet> createEntrySet() {
return new ImmutableMapEntrySet.RegularEntrySet(this, entries);
}
@Override
public void forEach(BiConsumer super K, ? super V> action) {
checkNotNull(action);
entries.forEach(e -> action.accept(e.getKey(), e.getValue()));
}
@Override
ImmutableSet createKeySet() {
return new ImmutableMapKeySet(this);
}
@Override
ImmutableCollection createValues() {
return new ImmutableMapValues(this);
}
@Override
boolean isPartialView() {
return false;
}
}
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