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}