com.google.common.collect.JdkBackedImmutableBiMap Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

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).

There is a newer version: 34.0.0.Final

Show newest version

/*
 * 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 static java.util.Objects.requireNonNull;

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 javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Implementation of ImmutableBiMap backed by a pair of JDK HashMaps, which have smartness
 * protecting against hash flooding.
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
final class JdkBackedImmutableBiMap extends ImmutableBiMap {
  @VisibleForTesting
  static  ImmutableBiMap create(int n, @Nullable Entry[] entryArray) {
    Map forwardDelegate = Maps.newHashMapWithExpectedSize(n);
    Map backwardDelegate = Maps.newHashMapWithExpectedSize(n);
    for (int i = 0; i < n; i++) {
      // requireNonNull is safe because the first `n` elements have been filled in.
      Entry e = RegularImmutableMap.makeImmutable(requireNonNull(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 @CheckForNull 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
  @CheckForNull
  public V get(@CheckForNull 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;
  }
}