// @(#)$Id: SymmetricCompareTo.java,v 1.6 2005/07/07 21:03:09 leavens Exp $
// Copyright (C) 2005 Iowa State University
//
// This file is part of the runtime library of the Java Modeling Language.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation; either version 2.1,
// of the License, or (at your option) any later version.
//
// 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 JML; see the file LesserGPL.txt. If not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
// 02110-1301 USA.
package org.jmlspecs.models.resolve;
/** Objects with a symmetric compareTo operation.
*
* @version $Revision: 1.6 $
* @author Gary T. Leavens
*/
public interface SymmetricCompareTo extends CompareTo {
/*@ public instance invariant
@ (\forall SymmetricCompareTo x, y;
@ x != null && y != null
@ && x.isComparableTo(y) || y.isComparableTo(x);
@ (x.isComparableTo(y) && y.isComparableTo(x))
@ && (x.compareTo(y) < 0 <==> y.compareTo(x) < 0)
@ && (x.compareTo(y) == 0 <==> y.compareTo(x) == 0));
@*/
/*@ public instance invariant_redundantly
@ (\forall SymmetricCompareTo x, y;
@ x != null && y != null
@ && x.isComparableTo(y) || y.isComparableTo(x);
@ (x.isComparableTo(y) && y.isComparableTo(x))
@ && x.compareTo(y) > 0 <==> y.compareTo(x) > 0);
@*/
}