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.runtime.functions.system;
020
021import lucee.runtime.PageContext;
022import lucee.runtime.exp.FunctionException;
023import lucee.runtime.ext.function.Function;
024import lucee.runtime.functions.string.Len;
025import lucee.runtime.interpreter.VariableInterpreter;
026import lucee.runtime.op.Caster;
027
028public class Empty implements Function {
029
030        private static final long serialVersionUID = 3780957672985941192L;
031        
032
033        public static boolean call(PageContext pc , String variableName) throws FunctionException {
034                Object res = VariableInterpreter.getVariableEL(pc, variableName,null);
035                
036                if(res==null) return true;
037                double len=Len.invoke(res, -1);
038                if(len==-1)throw new FunctionException(pc,"empty",1,"variable","this type  ["+Caster.toTypeName(res)+"] is not supported");
039                return len==0;
040        }
041}