Module com.darkcollective.relix.ast
Package com.darkcollective.relix.ast.visitor

Interface PredicateVisitor<R>

Type Parameters:
R - the return type produced by each visit method
public interface PredicateVisitor<R>
Visitor over the Predicate sealed hierarchy.

Implement this interface to process or transform boolean filter conditions. Every permitted predicate type has a dedicated visit overload.

See Also:

  • Method Details

    • visit

      R visit(ComparisonPredicate node)
      Visits a comparison predicate (=, ≠, <, ≤, >, ≥).

    • visit

      R visit(AndPredicate node)
      Visits a logical conjunction (∧).

    • visit

      R visit(OrPredicate node)
      Visits a logical disjunction (∨).

    • visit

      R visit(NotPredicate node)
      Visits a logical negation (¬).

    • visit

      R visit(NullPredicate node)
      Visits a null test (= ⊥ or ≠ ⊥).

    • visit

      R visit(ElementOfPredicate node)
      Visits a set-membership test (∈ or ∉).

    • visit

      R visit(PatternPredicate node)
      Visits a pattern-matching test (LIKE or NOT LIKE).

    • visit

      R visit(ExistsPredicate node)
      Visits a test for a relation's having a row (EXISTS (…)).

    • visit

      R visit(QuantifiedPredicate node)
      Visits a comparison with every value of a relation (x > ALL (…)).