Spring SpEl - Identify which part of an expression to trigger the rule

Question

Is there a way to identify which part of a SpEL expression trigger a rule ?

For example :

a < 10 || a > 20

I want to know if the rule is fired because a < 10 or a > 20

For example :

ExpressionParser parser = new SpelExpressionParser();
Expression expression = parser.parseExpression(rule.getExpression());
return Boolean.TRUE.equals(expression.getValue(evaluationContext, Boolean.class));

thanks to this I can know if the whole expression is true or false, in addition to this I would like to know more precisely that it has triggered the rule

Provide more informations if you really expect a response. – Zorglube May 02 '23 at 12:56 — Zorglube, May 02 '23 at 12:56

score 0 · Answer 1 · answered May 02 '23 at 13:03

It seems to me that there is no way to check it using the SPeL API. But you can modify your code (if its possible) slightly and split this expression into a list of expressions List<Expression>, so you will be able to iterate through the list of expressions and save the result of each. I hope this idea helps you somehow

Here is example code:

Map<Expression, Boolean> results = List.of(new Expression("a < 1"), new Expression("a > 20"))
    .stream()
    .collect(Collectors.toMap(Function.identity(), Expression::evaluate));

thanks for the answer but I think it won’t be very practical to manage — marojbor, May 05 '23 at 16:30

Spring SpEl - Identify which part of an expression to trigger the rule

1 Answers1