Pair.java

/*
 * $Id$
 *
 * License Agreement.
 *
 * Rich Faces - Natural Ajax for Java Server Faces (JSF)
 *
 * Copyright (C) 2007 Exadel, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */
package org.richfaces.cdk.util;

/**
 * <p class="changed_added_4_0">
 * </p>
 *
 * @author asmirnov@exadel.com
 */
public class Pair<A, B> {
    private final A first;
    private final B second;

    /**
     * <p class="changed_added_4_0">
     * </p>
     *
     * @param first
     * @param second
     */
    public Pair(A first, B second) {
        this.first = first;
        this.second = second;
    }

    public static <X, Y> Pair<X, Y> of(X first, Y second) {
        return new Pair<X, Y>(first, second);
    }

    /**
     * <p class="changed_added_4_0">
     * </p>
     *
     * @return the first
     */
    public A getFirst() {
        return this.first;
    }

    /**
     * <p class="changed_added_4_0">
     * </p>
     *
     * @return the second
     */
    public B getSecond() {
        return this.second;
    }

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#hashCode()
     */

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

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */

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