/*
 *  Licensed to GraphHopper and Peter Karich under one or more contributor
 *  license agreements. See the NOTICE file distributed with this work for 
 *  additional information regarding copyright ownership.
 * 
 *  GraphHopper 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 com.graphhopper.coll;

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

/**
 * Simple impl of Map.Entry. So that we can have ordered maps.
 * <p/>
 * @author Peter Karich
 */
public class MapEntry<K, V> implements Map.Entry<K, V>, Serializable
{
    private static final long serialVersionUID = 1L;
    private K key;
    private V value;

    public MapEntry( 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 )
    {
        this.value = value;
        return value;
    }

    @Override
    public String toString()
    {
        return getKey() + ", " + getValue();
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean equals( Object obj )
    {
        if (obj == null)
        {
            return false;
        }
        if (getClass() != obj.getClass())
        {
            return false;
        }
        final MapEntry<K, V> other = (MapEntry<K, V>) obj;
        if (this.key != other.key && (this.key == null || !this.key.equals(other.key)))
        {
            return false;
        }
        if (this.value != other.value && (this.value == null || !this.value.equals(other.value)))
        {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode()
    {
        int hash = 7;
        hash = 19 * hash + (this.key != null ? this.key.hashCode() : 0);
        hash = 19 * hash + (this.value != null ? this.value.hashCode() : 0);
        return hash;
    }
}
