com.google.common.collect.JdkBackedImmutableBiMap Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging 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) 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.google.common.collect;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.errorprone.annotations.concurrent.LazyInit;
import com.google.j2objc.annotations.RetainedWith;
import com.google.j2objc.annotations.WeakOuter;
import java.util.Map;
import org.checkerframework.checker.nullness.compatqual.NullableDecl;
/**
* Implementation of ImmutableBiMap backed by a pair of JDK HashMaps, which have smartness
* protecting against hash flooding.
*/
@GwtCompatible(emulated = true)
final class JdkBackedImmutableBiMap extends ImmutableBiMap {
@VisibleForTesting
static ImmutableBiMap create(int n, Entry[] entryArray) {
Map forwardDelegate = Maps.newHashMapWithExpectedSize(n);
Map backwardDelegate = Maps.newHashMapWithExpectedSize(n);
for (int i = 0; i < n; i++) {
Entry e = RegularImmutableMap.makeImmutable(entryArray[i]);
entryArray[i] = e;
V oldValue = forwardDelegate.putIfAbsent(e.getKey(), e.getValue());
if (oldValue != null) {
throw conflictException("key", e.getKey() + "=" + oldValue, entryArray[i]);
}
K oldKey = backwardDelegate.putIfAbsent(e.getValue(), e.getKey());
if (oldKey != null) {
throw conflictException("value", oldKey + "=" + e.getValue(), entryArray[i]);
}
}
ImmutableList> entryList = ImmutableList.asImmutableList(entryArray, n);
return new JdkBackedImmutableBiMap<>(entryList, forwardDelegate, backwardDelegate);
}
private final transient ImmutableList> entries;
private final Map forwardDelegate;
private final Map backwardDelegate;
private JdkBackedImmutableBiMap(
ImmutableList> entries, Map forwardDelegate, Map backwardDelegate) {
this.entries = entries;
this.forwardDelegate = forwardDelegate;
this.backwardDelegate = backwardDelegate;
}
@Override
public int size() {
return entries.size();
}
@LazyInit @RetainedWith private transient JdkBackedImmutableBiMap inverse;
@Override
public ImmutableBiMap inverse() {
JdkBackedImmutableBiMap result = inverse;
if (result == null) {
inverse =
result =
new JdkBackedImmutableBiMap(
new InverseEntries(), backwardDelegate, forwardDelegate);
result.inverse = this;
}
return result;
}
@WeakOuter
private final class InverseEntries extends ImmutableList> {
@Override
public Entry get(int index) {
Entry entry = entries.get(index);
return Maps.immutableEntry(entry.getValue(), entry.getKey());
}
@Override
boolean isPartialView() {
return false;
}
@Override
public int size() {
return entries.size();
}
}
@Override
public V get(@NullableDecl Object key) {
return forwardDelegate.get(key);
}
@Override
ImmutableSet> createEntrySet() {
return new ImmutableMapEntrySet.RegularEntrySet(this, entries);
}
@Override
ImmutableSet createKeySet() {
return new ImmutableMapKeySet(this);
}
@Override
boolean isPartialView() {
return false;
}
}
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