@java.lang.FunctionalInterface
public interface PredicateGenerator.CriterionHandler

Extension point for user-defined criterion handlers. Register a handler for a custom Query.Criterion subclass to have it converted to a JPA jakarta.persistence.criteria.Predicate during query execution. Registered handlers are checked first, before any built-in criterion handling, so a handler can also override built-in behavior.

Example registration (e.g., in BootStrap.groovy):

     PredicateGenerator.registerCriterionHandler(MyCustomCriterion) { query, root, cb, criterion ->
         def c = criterion as MyCustomCriterion
         cb.like(cb.cast(root.get(c.property), String), c.value)
     }
 

Type Parameters:

C - the specific criterion type