Variable.java

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/* Variable Java class declaration and implementation.
   Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
   Copyright (C) 2010-2012 BUGSENG srl (http://bugseng.com)

This file is part of the Parma Polyhedra Library (PPL).

The PPL is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

The PPL 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
for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.

For the most up-to-date information see the Parma Polyhedra Library
site: http://bugseng.com/products/ppl/ . */

package parma_polyhedra_library;

import javax.management.RuntimeErrorException;


public class Variable implements Comparable<Variable> {
    private int varid;


    public Variable(int i) {
        if (i < 0)
            throw new
                RuntimeErrorException(new Error("parma_polyhedra_library.Variable::"
                                                + "Variable:"
                                                + " an index variable"
                                                + " cannot be negative."));
        varid = i;
    }

    public int id() {
        return varid;
    }

    public int compareTo(Variable v) {
        return varid - v.varid;
    }

    private static native void initIDs();
    static {
        initIDs();
    }
}