PredicateGenerator (GORM for Hibernate 5

org.grails.orm.hibernate.query.PredicateGenerator

```
public class PredicateGenerator
extends java.lang.Object
```
A class that generates predicates for a given list of criteria.
Authors:
walterduquedeestrada
graemerocher
Since:
7.0.0

Nested Class Summary

Nested classes
Modifiers	Name	Description
`interface`	`PredicateGenerator.CriterionHandler`	Extension point for user-defined criterion handlers.
`interface`	`PredicateGenerator.CriterionHandlerProvider`	SPI for contributing a CriterionHandler via java.util.ServiceLoader.

Field Summary

Fields
Modifiers	Name	Description
`static java.util.Map<java.lang.Class<? extends Query.Criterion>, CriterionHandler>`	`CUSTOM_HANDLERS`

Constructor Summary

Constructors
Constructor and description
`PredicateGenerator(org.hibernate.query.criteria.HibernateCriteriaBuilder criteriaBuilder, org.springframework.core.convert.ConversionService conversionService)`

Methods Summary

Methods
Type Params	Return Type	Name and description
	`public static void`	`clearCustomCriterionHandlers()` Removes all registered custom criterion handlers and resets the ServiceLoader flag.
	`public jakarta.persistence.criteria.Predicate`	`generate(jakarta.persistence.criteria.AbstractQuery<?> cq, jakarta.persistence.criteria.From<?, ?> root, java.util.List<Query.Criterion> criteriaList, JpaQueryContext tablesByName, GrailsHibernatePersistentEntity entity)`
	`public jakarta.persistence.criteria.Predicate[]`	`getPredicates(jakarta.persistence.criteria.AbstractQuery<?> criteriaQuery, jakarta.persistence.criteria.From<?, ?> root, java.util.List<? extends Query.QueryElement> criteria, JpaQueryContext fromsByProvider, GrailsHibernatePersistentEntity entity)`
	`public jakarta.persistence.criteria.Predicate`	`handleCriterion(jakarta.persistence.criteria.AbstractQuery<?> criteriaQuery, jakarta.persistence.criteria.From<?, ?> root, JpaQueryContext fromsByProvider, GrailsHibernatePersistentEntity entity, QueryElement criterion)`
	`public static void`	`registerCriterionHandler(java.lang.Class<? extends Query.Criterion> type, PredicateGenerator.CriterionHandler handler)` Registers a CriterionHandler for the given criterion type.

Inherited Methods Summary

Inherited Methods
Methods inherited from class	Name
`class java.lang.Object`	`java.lang.Object#equals(java.lang.Object), java.lang.Object#getClass(), java.lang.Object#hashCode(), java.lang.Object#notify(), java.lang.Object#notifyAll(), java.lang.Object#toString(), java.lang.Object#wait(), java.lang.Object#wait(long), java.lang.Object#wait(long, int)`

- Field Detail
  - public static final java.util.Map<java.lang.Class<? extends Query.Criterion>, CriterionHandler> CUSTOM_HANDLERS
- Constructor Detail
  - public PredicateGenerator(org.hibernate.query.criteria.HibernateCriteriaBuilder criteriaBuilder, org.springframework.core.convert.ConversionService conversionService)
- Method Detail
  - public static void clearCustomCriterionHandlers()
    
    Removes all registered custom criterion handlers and resets the ServiceLoader flag. Useful for test cleanup.
  - public jakarta.persistence.criteria.Predicate generate(jakarta.persistence.criteria.AbstractQuery<?> cq, jakarta.persistence.criteria.From<?, ?> root, java.util.List<Query.Criterion> criteriaList, JpaQueryContext tablesByName, GrailsHibernatePersistentEntity entity)
  - public jakarta.persistence.criteria.Predicate[] getPredicates(jakarta.persistence.criteria.AbstractQuery<?> criteriaQuery, jakarta.persistence.criteria.From<?, ?> root, java.util.List<? extends Query.QueryElement> criteria, JpaQueryContext fromsByProvider, GrailsHibernatePersistentEntity entity)
  - public jakarta.persistence.criteria.Predicate handleCriterion(jakarta.persistence.criteria.AbstractQuery<?> criteriaQuery, jakarta.persistence.criteria.From<?, ?> root, JpaQueryContext fromsByProvider, GrailsHibernatePersistentEntity entity, QueryElement criterion)
  - public static void registerCriterionHandler(java.lang.Class<? extends Query.Criterion> type, PredicateGenerator.CriterionHandler handler)
    
    Registers a CriterionHandler for the given criterion type. The handler is called before any built-in criterion logic when a criterion of exactly that type is encountered. Programmatic registration takes precedence over java.util.ServiceLoader-discovered handlers.
    Parameters:
    type - the exact criterion class to handle
    handler - the handler that converts the criterion to a JPA jakarta.persistence.criteria.Predicate

| Detail:
Field
Constructor
Method

[Java] Class PredicateGenerator

Nested Class Summary

Field Summary

Constructor Summary

Methods Summary

Inherited Methods Summary

Field Detail

public static final java.util.Map<java.lang.Class<? extends Query.Criterion>, CriterionHandler> CUSTOM_HANDLERS

Constructor Detail

public PredicateGenerator(org.hibernate.query.criteria.HibernateCriteriaBuilder criteriaBuilder, org.springframework.core.convert.ConversionService conversionService)

Method Detail

public static void clearCustomCriterionHandlers()

public jakarta.persistence.criteria.Predicate generate(jakarta.persistence.criteria.AbstractQuery<?> cq, jakarta.persistence.criteria.From<?, ?> root, java.util.List<Query.Criterion> criteriaList, JpaQueryContext tablesByName, GrailsHibernatePersistentEntity entity)

public jakarta.persistence.criteria.Predicate[] getPredicates(jakarta.persistence.criteria.AbstractQuery<?> criteriaQuery, jakarta.persistence.criteria.From<?, ?> root, java.util.List<? extends Query.QueryElement> criteria, JpaQueryContext fromsByProvider, GrailsHibernatePersistentEntity entity)

public jakarta.persistence.criteria.Predicate handleCriterion(jakarta.persistence.criteria.AbstractQuery<?> criteriaQuery, jakarta.persistence.criteria.From<?, ?> root, JpaQueryContext fromsByProvider, GrailsHibernatePersistentEntity entity, QueryElement criterion)

public static void registerCriterionHandler(java.lang.Class<? extends Query.Criterion> type, PredicateGenerator.CriterionHandler handler)