Generator.java

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/* Generator Java class declaration and implementation.
   Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
   Copyright (C) 2010-2016 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 Generator {
    private Generator_Type gt;

    private Linear_Expression le;

    private Coefficient div;

    private Generator(Linear_Expression e, Generator_Type g_type) {
        le = e.clone();
        gt = g_type;
    }


    public static Generator closure_point(Linear_Expression e, Coefficient d) {
        if (d.getBigInteger().equals(java.math.BigInteger.ZERO)) {
            Error cause = new Error("parma_polyhedra_library.Generator::"
                                    + "Generator(e, d):\n"
                                    + "the divisor can not be zero.");
            throw new RuntimeErrorException(cause);
        }
        Generator g = new Generator(e, Generator_Type.CLOSURE_POINT);
        g.div = new Coefficient(d);
        return g;
    }


    public static Generator line(Linear_Expression e) {
        return new Generator(e, Generator_Type.LINE);
    }


    public static Generator point(Linear_Expression e, Coefficient d) {
        if (d.getBigInteger().equals(java.math.BigInteger.ZERO)) {
            Error cause = new Error("parma_polyhedra_library.Generator::"
                                    + "Generator(e, d):\n"
                                    + "the divisor can not be zero.");
            throw new RuntimeErrorException(cause);
        }

        Generator g = new Generator(e, Generator_Type.POINT);
        g.div = new Coefficient(d);
        return g;
    }


    public static Generator ray(Linear_Expression e) {
        return new Generator(e, Generator_Type.RAY);
    }

    public Generator_Type type() {
        return gt;
    }

    public Linear_Expression linear_expression() {
        return le;
    }


    public Coefficient divisor() {
        if (this.gt == Generator_Type.POINT
            || this.gt == Generator_Type.CLOSURE_POINT)
            return div;
        Error cause = new Error("parma_polyhedra_library.Generator::divisor:\n"
                                + "this is neither a point"
                                + " nor a closure point.");
        throw new RuntimeErrorException(cause);
    }

    public native String ascii_dump();

    public native String toString();

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