/* * 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.uml.ocl.expr;import org.tzi.use.uml.ocl.type.CollectionType;import org.tzi.use.uml.ocl.value.CollectionValue;import org.tzi.use.uml.ocl.value.UndefinedValue;import org.tzi.use.uml.ocl.value.Value;/**  * OCL 1.4 any expression. * * @version     $ProjectVersion: 2-3-0-release.1 $ * @author  Mark Richters */public class ExpAny extends ExpQuery {        /**     * Constructs an any expression. <code>elemVarDecl</code> may be null.     */    public ExpAny(VarDecl elemVarDecl,                  Expression rangeExp,                   Expression queryExp)         throws ExpInvalidException    {        // result is type of range elements        super(((CollectionType) rangeExp.type()).elemType(),              ( elemVarDecl != null ) ?               new VarDeclList(elemVarDecl) : new VarDeclList(true),              rangeExp, queryExp);            // queryExp must be a boolean expression        assertBooleanQuery();    }    /**      * Return name of query expression.     */    public String name() {        return "any";    }    /**     * Evaluates expression and returns result value.     */    public Value eval(EvalContext ctx) {        Value res = new UndefinedValue(type());        ctx.enter(this);        Value v = evalSelectOrReject(ctx, true);        if (! v.isUndefined() ) {            CollectionValue coll = (CollectionValue) evalSelectOrReject(ctx, true);            if (coll.size() > 0 ) {                res = (Value) coll.iterator().next();            }        }        ctx.exit(this, res);        return res;    }}