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 /*
  * Copyright (C) 2013 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 com.google.common.collect.CollectPreconditions.checkEntryNotNull;
import  javax.annotation.Nullable;

Implementation of Map.Entry for ImmutableMap that adds extra methods to traverse hash buckets for the key and the value. This allows reuse in RegularImmutableMap and RegularImmutableBiMap, which don't have to recopy the entries created by their Builder implementations.

Author(s):
Louis Wasserman
@GwtIncompatible("unnecessary")
abstract class ImmutableMapEntry<K, V> extends ImmutableEntry<K, V> {
  ImmutableMapEntry(K key, V value) {
    super(keyvalue);
    checkEntryNotNull(keyvalue);
  }
  ImmutableMapEntry(ImmutableMapEntry<K, V> contents) {
    super(contents.getKey(), contents.getValue());
    // null check would be redundant
  }
  @Nullable
  abstract ImmutableMapEntry<K, V> getNextInKeyBucket();
  @Nullable
  abstract ImmutableMapEntry<K, V> getNextInValueBucket();
  static final class TerminalEntry<K, V> extends ImmutableMapEntry<K, V> {
    TerminalEntry(ImmutableMapEntry<K, V> contents) {
      super(contents);
    }
    TerminalEntry(K key, V value) {
      super(keyvalue);
    }
    @Override
    @Nullable
      return null;
    }
    @Override
    @Nullable
      return null;
    }
  }
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