Hi,
The use case is to lazily evaluate variables in expression, as they are
costly.
Jexl already supports boolean short circuiting. Expression = ((A || B) &&C)
if A = True, B doesn't have to be set during expression evaluation.
However if A = False and B is not set, the evaluation throws JexlException
exception - undefined variable B.
One approach I tried Is to catch JexlException and then proceeding to
evaluate missing variable.
private String getNextVariableToEvaluate(){
try { expression.evaluate(context);
} catch (JexlException.Variable jexl) {
return jexl.getVariable();
}
return null;
}
This works, but because of throwing Exceptions it can be costly as it
generates stack trace every time.
Is there a clean way to find out if the expression can be short circuited
with what variables value we know currently?
If not, which is the variable that should be evaluated?
--
Udit Kumar Gupta
