/*
    * 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 java.io.Serializable;
  
  import javax.annotation.Nullable;
  
  /**
   * @see com.google.common.collect.Maps#immutableEntry(Object, Object)
   */
  @GwtCompatible(serializable = true)
  class ImmutableEntry<K, V> extends AbstractMapEntry<K, V>
      implements Serializable {
    final K key;
    final V value;
  
    ImmutableEntry(@Nullable K key, @Nullable V value) {
      this.key = key;
      this.value = value;
    }
  
    @Nullable @Override public final K getKey() {
      return key;
    }
  
    @Nullable @Override public final V getValue() {
      return value;
    }
  
    @Override public final V setValue(V value) {
      throw new UnsupportedOperationException();
    }
  
    private static final long serialVersionUID = 0;
  }