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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.rapiddweller.common.collection;

import com.rapiddweller.common.NullSafeComparator;

import java.util.Map;

/**
 * Simple implementation of the Map.Entry interface.
 *
 * @param  the key type
 * @param  the value type
 * @author Volker Bergmann
 * @since 0.3.0
 */
public class MapEntry implements Map.Entry {

  private final K key;
  private V value;

  /**
   * Instantiates a new Map entry.
   *
   * @param key   the key
   * @param value the value
   */
  public MapEntry(K key, V value) {
    super();
    this.key = key;
    this.value = value;
  }

  // interface -------------------------------------------------------------------------------------------------------

  @Override
  public K getKey() {
    return key;
  }

  @Override
  public V getValue() {
    return value;
  }

  @Override
  public V setValue(V value) {
    V old = this.value;
    this.value = value;
    return old;
  }

  @Override
  public String toString() {
    return String.valueOf(key) + '=' + value;
  }

  @Override
  public int hashCode() {
    return ((key == null) ? 0 : key.hashCode()) * 31 + ((value == null) ? 0 : value.hashCode());
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }
    @SuppressWarnings("rawtypes")
    MapEntry that = (MapEntry) obj;
    return NullSafeComparator.equals(this.key, that.key) && NullSafeComparator.equals(this.value, that.value);
  }

}