001    package railo.runtime.functions.decision;
002    
003    import railo.runtime.PageContext;
004    import railo.runtime.exp.FunctionException;
005    import railo.runtime.exp.PageException;
006    import railo.runtime.ext.function.Function;
007    import railo.runtime.functions.string.Len;
008    import railo.runtime.op.Caster;
009    import railo.runtime.op.Decision;
010    
011    public class IsEmpty implements Function {
012    
013            private static final long serialVersionUID = -2839407878650099024L;
014    
015            public static boolean call(PageContext pc , Object value) throws PageException {
016                    if(value==null) return true;
017                    if(value instanceof Boolean) return !Caster.toBoolean(value);
018                    if(value instanceof Number) return Caster.toDoubleValue(value)==0D;
019                    
020                    
021                    double len=Len.invoke(value, -1);
022                    if(len==-1)throw new FunctionException(pc,"isEmpty",1,"variable","this type  ["+Caster.toTypeName(value)+"] is not supported");
023                    return len==0;
024            }
025    
026    }