001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019package lucee.transformer.cfml.evaluator.func.impl; 020 021import lucee.runtime.exp.TemplateException; 022import lucee.transformer.bytecode.expression.Expression; 023import lucee.transformer.bytecode.expression.var.Argument; 024import lucee.transformer.bytecode.expression.var.BIF; 025import lucee.transformer.bytecode.expression.var.NullExpression; 026import lucee.transformer.bytecode.expression.var.Variable; 027import lucee.transformer.cfml.evaluator.FunctionEvaluator; 028import lucee.transformer.library.function.FunctionLibFunction; 029 030public class IsNull implements FunctionEvaluator{ 031 032 public void evaluate(BIF bif, FunctionLibFunction flf) throws TemplateException { 033 Argument arg = bif.getArguments()[0]; 034 Expression value = arg.getValue(); 035 036 037 038 if(value instanceof Variable){ 039 ((Variable)value).setDefaultValue(NullExpression.NULL_EXPRESSION); 040 041 042 /*try{ 043 ExprString exprStr=VariableString.translateVariableToExprString(value,false); 044 arg.setValue(exprStr,String.class.getName()); 045 } 046 catch(Throwable t){ 047 048 }*/ 049 } 050 } 051 052}