73 lines
2.0 KiB
Java
73 lines
2.0 KiB
Java
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/*
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* Copyright (C) 2013 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import static com.google.common.collect.CollectPreconditions.checkEntryNotNull;
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import javax.annotation.Nullable;
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import com.google.common.annotations.GwtIncompatible;
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/**
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* Implementation of {@code Map.Entry} for {@link ImmutableMap} that adds extra
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* methods to traverse hash buckets for the key and the value. This allows reuse
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* in {@link RegularImmutableMap} and {@link RegularImmutableBiMap}, which don't
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* have to recopy the entries created by their {@code Builder} implementations.
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*
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* @author Louis Wasserman
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*/
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@GwtIncompatible("unnecessary")
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abstract class ImmutableMapEntry<K, V> extends ImmutableEntry<K, V> {
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ImmutableMapEntry(K key, V value) {
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super(key, value);
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checkEntryNotNull(key, value);
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}
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ImmutableMapEntry(ImmutableMapEntry<K, V> contents) {
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super(contents.getKey(), contents.getValue());
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// null check would be redundant
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}
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@Nullable
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abstract ImmutableMapEntry<K, V> getNextInKeyBucket();
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@Nullable
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abstract ImmutableMapEntry<K, V> getNextInValueBucket();
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static final class TerminalEntry<K, V> extends ImmutableMapEntry<K, V> {
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TerminalEntry(ImmutableMapEntry<K, V> contents) {
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super(contents);
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}
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TerminalEntry(K key, V value) {
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super(key, value);
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}
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@Override
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@Nullable
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ImmutableMapEntry<K, V> getNextInKeyBucket() {
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return null;
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}
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@Override
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@Nullable
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ImmutableMapEntry<K, V> getNextInValueBucket() {
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return null;
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}
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}
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}
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