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Java example source code file (ImmutableMapEntrySet.java)

This example Java source code file (ImmutableMapEntrySet.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotation, entry, entrysetserializedform, gwtcompatible, gwtincompatible, immutablelist, immutablemap, immutablemapentryset, immutableset, object, override, regularentryset, regularimmutableaslist, serializable

The ImmutableMapEntrySet.java Java example source code

/*
 * Copyright (C) 2008 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.GwtIncompatible;
import com.google.j2objc.annotations.Weak;

import java.io.Serializable;
import java.util.Map.Entry;

import javax.annotation.Nullable;

/**
 * {@code entrySet()} implementation for {@link ImmutableMap}.
 *
 * @author Jesse Wilson
 * @author Kevin Bourrillion
 */
@GwtCompatible(emulated = true)
abstract class ImmutableMapEntrySet<K, V> extends ImmutableSet> {
  static final class RegularEntrySet<K, V> extends ImmutableMapEntrySet {
    @Weak private final transient ImmutableMap<K, V> map;
    private final transient Entry<K, V>[] entries;

    RegularEntrySet(ImmutableMap<K, V> map, Entry[] entries) {
      this.map = map;
      this.entries = entries;
    }

    @Override
    ImmutableMap<K, V> map() {
      return map;
    }

    @Override
    public UnmodifiableIterator<Entry iterator() {
      return asList().iterator();
    }

    @Override
    ImmutableList<Entry createAsList() {
      return new RegularImmutableAsList<Entry(this, entries);
    }
  }

  ImmutableMapEntrySet() {}

  abstract ImmutableMap<K, V> map();

  @Override
  public int size() {
    return map().size();
  }

  @Override
  public boolean contains(@Nullable Object object) {
    if (object instanceof Entry) {
      Entry<?, ?> entry = (Entry) object;
      V value = map().get(entry.getKey());
      return value != null && value.equals(entry.getValue());
    }
    return false;
  }

  @Override
  boolean isPartialView() {
    return map().isPartialView();
  }

  @Override
  @GwtIncompatible // not used in GWT
  boolean isHashCodeFast() {
    return map().isHashCodeFast();
  }

  @Override
  public int hashCode() {
    return map().hashCode();
  }

  @GwtIncompatible // serialization
  @Override
  Object writeReplace() {
    return new EntrySetSerializedForm<K, V>(map());
  }

  @GwtIncompatible // serialization
  private static class EntrySetSerializedForm<K, V> implements Serializable {
    final ImmutableMap<K, V> map;

    EntrySetSerializedForm(ImmutableMap<K, V> map) {
      this.map = map;
    }

    Object readResolve() {
      return map.entrySet();
    }

    private static final long serialVersionUID = 0;
  }
}

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