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/*
 * Copyright 2001-2009 Terracotta, Inc.
 *
 * 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 org.quartz.utils;

/**
 * 
 * Utility class for storing two pieces of information together.
 * 
 *
 * @author Jeffrey Wescott
 */
public class Pair {

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     *
     * Data members.
     *
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    private Object first;

    private Object second;


    public Pair()
    {}

    public Pair(Object first, Object second)
    {
        setFirst(first);
        setSecond(second);
    }

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     *
     * Interface.
     *
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    /**
     * 
     * Get the first object in the pair.
     * 
     *
     * @return the first object
     */
    public final Object getFirst() {
        return first;
    }

    /**
     * 
     * Set the value of the first object in the pair.
     * 
     *
     * @param first
     *          the first object
     */
    public final void setFirst(Object first) {
        this.first = first;
    }

    /**
     * 
     * Get the second object in the pair.
     * 
     *
     * @return the second object
     */
    public final Object getSecond() {
        return second;
    }

    /**
     * 
     * Set the second object in the pair.
     * 
     *
     * @param second
     *          the second object
     */
    public final void setSecond(Object second) {
        this.second = second;
    }

    /**
     * 
     * Test equality of this object with that.
     * 
     *
     * @param that
     *          object to compare
     * @return true if objects are equal, false otherwise
     */
    public boolean equals(Object that) {
        if (this == that) {
            return true;
        } else {
            try {
                Pair other = (Pair) that;
                if(first == null && second == null)
                    return (other.first == null && other.second == null);
                else if(first == null)
                    return this.second.equals(other.second);
                else if(second == null)
                    return this.first.equals(other.first);
                else
                    return (this.first.equals(other.first) && this.second
                        .equals(other.second));

            } catch (ClassCastException e) {
                return false;
            }
        }
    }

    public int hashCode() {
        if(first != null && second != null)
            return (first.hashCode() ^ second.hashCode());
        if(first != null)
            return (17 ^ first.hashCode());
        if(second != null)
            return (17 ^ second.hashCode());
        return super.hashCode();
    }
}

// EOF