/*

 * Copyright 1999-2005 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.tools.javac.util;

/** A generic class for pairs.

 *

 *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If

 *  you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class Pair<A, B> {

    public final A fst;

    public final B snd;

    public Pair(A fst, B snd) {

        this.fst = fst;

        this.snd = snd;

    }

    public String toString() {

        return "Pair[" + fst + "," + snd + "]";

    }

    private static boolean equals(Object x, Object y) {

        return (x == null && y == null) || (x != null && x.equals(y));

    }

    public boolean equals(Object other) {

        return

    }

    public int hashCode() {

        if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1;

        else if (snd == null) return fst.hashCode() + 2;

        else return fst.hashCode() * 17 + snd.hashCode();

    }

    public static <A,B> Pair<A,B> of(A a, B b) {

        return new Pair<A,B>(a,b);

    }

}