public final String evaluateString( Message message ) throws JMSException
    {
        Object value = evaluate(message);
        if (value == null)
            return null;
        
        if (value instanceof String)
            return (String)value;
        
        throw new FFMQException("Expected a string but got : "+value.toString(),"INVALID_SELECTOR_EXPRESSION");
    }
public final String evaluateString ( Message message ) throws JMSException { Object value = evaluate ( message ) ; if ( value == null ) return null ; if ( value instanceof String ) return ( String ) value ; throw new FFMQException ( "Expected a string but got : " + value . toString ( ) , "INVALID_SELECTOR_EXPRESSION" ) ; }
Evaluate this node as a string