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/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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.orientechnologies.common.util;

import java.util.Map.Entry;

/**
 * Keeps a pair of values as Key/Value.
 * 
 * @author Luca Garulli (l.garulli--at--orientechnologies.com)
 * 
 * @param 
 *          Key
 * @param 
 *          Value
 * @see OTriple
 */
public class OPair, V> implements Entry, Comparable> {
	public K	key;
	public V	value;

	public OPair() {
	}

	public OPair(final K iKey, final V iValue) {
		key = iKey;
		value = iValue;
	}

	public OPair(final Entry iSource) {
		key = iSource.getKey();
		value = iSource.getValue();
	}

	public void init(final K iKey, final V iValue) {
		key = iKey;
		value = iValue;
	}

	public K getKey() {
		return key;
	}

	public V getValue() {
		return value;
	}

	public V setValue(final V iValue) {
		V oldValue = value;
		value = iValue;
		return oldValue;
	}

	@Override
	public String toString() {
		return key + ":" + value;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((key == null) ? 0 : key.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		OPair other = (OPair) obj;
		if (key == null) {
			if (other.key != null)
				return false;
		} else if (!key.equals(other.key))
			return false;
		return true;
	}

	public int compareTo(final OPair o) {
		return key.compareTo(o.key);
	}
}