/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 java.util;


/**
 * MapEntry is an internal class which provides an implementation of Map.Entry.
 */
class MapEntry<K,V> implements Map.Entry<K,V>, Cloneable {
	
	K key;
    V value;

	interface Type<RT,KT,VT> {
		RT get(MapEntry<KT,VT> entry);
	}

	MapEntry(K theKey) {
		key = theKey;
	}

	MapEntry(K theKey, V theValue) {
		key = theKey;
		value = theValue;
	}

	@Override
    public Object clone() {
		try {
			return super.clone();
		} catch (CloneNotSupportedException e) {
			return null;
		}
	}

	@Override
    public boolean equals(Object object) {
		if (this == object) {
            return true;
        }
		if (object instanceof Map.Entry) {
			Map.Entry<?, ?> entry = (Map.Entry<?, ?>) object;
			return (key == null ? entry.getKey() == null : key.equals(entry
					.getKey()))
					&& (value == null ? entry.getValue() == null : value
							.equals(entry.getValue()));
		}
        return false;
	}

	public K getKey() {
		return key;
	}

	public V getValue() {
		return value;
	}

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

	public V setValue(V object) {
		V result = value;
		value = object;
		return result;
	}
    
    @Override
    public String toString() {
        return key + "=" + value;
    }
}
