astdestroycmd.java

UML设计测试工具

/*
 * USE - UML based specification environment
 * Copyright (C) 1999-2004 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.
 */

/* $ProjectHeader: use 2-3-0-release.1 Mon, 12 Sep 2005 20:18:33 +0200 green $ */

package org.tzi.use.parser.cmd;

import java.util.Iterator;
import java.util.List;

import org.tzi.use.parser.Context;
import org.tzi.use.parser.SemanticException;
import org.tzi.use.parser.ocl.ASTExpression;
import org.tzi.use.uml.ocl.expr.Expression;
import org.tzi.use.uml.ocl.type.CollectionType;
import org.tzi.use.uml.ocl.type.Type;
import org.tzi.use.uml.sys.MCmd;
import org.tzi.use.uml.sys.MCmdDestroyObjects;

/**
 * Node of the abstract syntax tree constructed by the parser.
 *
 * @version     $ProjectVersion: 2-3-0-release.1 $
 * @author  Mark Richters
 */
public class ASTDestroyCmd extends ASTCmd {
    private List fExprList; // (ASTExpression)
    
    public ASTDestroyCmd(List exprList) {
        fExprList = exprList;
    }

    public MCmd gen(Context ctx) throws SemanticException {
        // generate expressions
        Expression[] exprs = new Expression[fExprList.size()];
        Iterator it = fExprList.iterator();
        int i = 0;
        while (it.hasNext() ) {
            ASTExpression astExpr = (ASTExpression) it.next();
            Expression expr = astExpr.gen(ctx);
            Type t = expr.type();
            if (t.isObjectType() 
                || ( t.isCollection() && ((CollectionType) t).elemType().isObjectType()) ) {
                exprs[i++] = expr;
            } else {
                throw new SemanticException(astExpr.getStartToken(), 
                                            "Expected expression of object or collection type, " +
                                            "found `" + expr.type() + "'."); 
            }   
        }
        return new MCmdDestroyObjects(ctx.systemState(), exprs); 
    }        
}