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/* Variable 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;
//! A dimension of the vector space.
/*! \ingroup PPL_Java_interface
An object of the class Variable represents a dimension of the space,
that is one of the Cartesian axes.
Variables are used as basic blocks in order to build
more complex linear expressions.
Each variable is identified by a non-negative integer,
representing the index of the corresponding Cartesian axis
(the first axis has index 0).
*/
public class Variable implements Comparable<Variable> {
//! The index of the Cartesian axis.
private long varid;
//! Builds the variable corresponding to the Cartesian axis of index \p i.
/*!
\exception RuntimeErrorException
Thrown if <CODE>i</CODE> is has negative value.
*/
public Variable(long i) {
if (i < 0)
throw new
RuntimeErrorException(new Error("parma_polyhedra_library.Variable::"
+ "Variable:"
+ " an index variable"
+ " cannot be negative."));
varid = i;
}
//! Returns the index of the Cartesian axis associated to \p this.
public long id() {
return varid;
}
/*! \brief
Returns a negative number if \p this is smaller than \p v,
a zero if \p this equals \p v, a positive number if \p v
is greater than \p v.
*/
public int compareTo(Variable v) {
if (varid < v.varid)
return -1;
else if (varid == v.varid)
return 0;
else
return 1;
}
//! Optional customization provider for \c toString.
private static Variable_Stringifier stringifier;
/*! \brief
Sets the variable stringifier object.
A variable stringifier object provides customization for the
\c toString method; if no variable stringifier object is set
(or if it is set to a null refeerence value), the PPL default
variable output function will be used.
*/
public static native void setStringifier(Variable_Stringifier vs);
public native String toString();
private static native void initIDs();
static {
initIDs();
}
}
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