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.decision; 020 021import lucee.runtime.PageContext; 022import lucee.runtime.exp.FunctionException; 023import lucee.runtime.exp.PageException; 024import lucee.runtime.ext.function.Function; 025import lucee.runtime.functions.string.Len; 026import lucee.runtime.op.Caster; 027 028public class IsEmpty implements Function { 029 030 private static final long serialVersionUID = -2839407878650099024L; 031 032 public static boolean call(PageContext pc , Object value) throws PageException { 033 if(value==null) return true; 034 if(value instanceof Boolean || value instanceof Number) return false; 035 036 037 double len=Len.invoke(value, -1); 038 if(len==-1)throw new FunctionException(pc,"isEmpty",1,"variable","this type ["+Caster.toTypeName(value)+"] is not supported"); 039 return len==0; 040 } 041}