MapEntryImpl.java

/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.util.internal.map.sorted;

import java.io.Serializable;
import java.util.Map;

/**
 * The sorted map entry implementation (serializable).
 */
final class MapEntryImpl<K, V> implements Map.Entry<K, V>, Serializable {

	private static final long serialVersionUID = 0x600L; // Version.
	K key;
	V value;

	public MapEntryImpl(K key, V value) {
		this.key = key;
		this.value = value;
	}

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

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

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

	@SuppressWarnings("rawtypes")
	@Override
	public boolean equals(Object obj) {
		// As per Map.Entry contract.
		if (!(obj instanceof Map.Entry))
			return false;
		Map.Entry that = (Map.Entry) obj;
		return (this.getKey() == null ? that.getKey() == null : this.getKey()
				.equals(that.getKey()))
				&& (this.getValue() == null ? that.getValue() == null : this
						.getValue().equals(that.getValue()));
	}

	@Override
	public int hashCode() {
		// As per Map.Entry contract.
		return (getKey() == null ? 0 : getKey().hashCode())
				^ (getValue() == null ? 0 : getValue().hashCode());
	}

}