gevalvariableassignment.java

UML设计测试工具

/*
 * This is source code of the Snapshot Generator, an extension for USE
 * to generate (valid) system states of UML models.
 * Copyright (C) 2001 Joern Bohling, University of Bremen
 *
 * About USE:
 *   USE - UML based specification environment
 *   Copyright (C) 1999,2000,2001 Mark Richters, University of Bremen
 *
 * This program 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 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/**
 * March 22th 2001 
 * @author  Joern Bohling
 */

package org.tzi.use.gen.assl.dynamics;

import org.tzi.use.gen.assl.statics.GVariableAssignment;
import org.tzi.use.uml.ocl.value.Value;

class GEvalVariableAssignment extends GEvalInstruction
    implements IGCaller {
    private GVariableAssignment fInstr;
    private IGCaller fCaller;

    public GEvalVariableAssignment(GVariableAssignment instr) {
        fInstr = instr;
    }
    
    public void eval(GConfiguration conf,
                     IGCaller caller,
                     IGCollector collector) throws GEvaluationException {
        collector.detailPrintWriter().println("evaluating `" + fInstr + "'");
        fCaller = caller;
        GCreator.createFor(fInstr.sourceInstr()).eval( conf, this, collector );
    }

    public void feedback( GConfiguration conf,
                          Value value,
                          IGCollector collector ) throws GEvaluationException {
        // value can be undefined, that's ok
        collector.detailPrintWriter().println(fInstr.target() + ":=" + value );
        conf.varBindings().push(fInstr.target(), value);
        //collector.registerChange( fInstr.target() + ":=" + value );
        fCaller.feedback( conf, null, collector );
        collector.detailPrintWriter().println("undo: " + fInstr.target() + ":=" + value );
        conf.varBindings().pop();
    }

    public String toString() {
        return "GEvalVariableAssignment";
    }

}