org.apache.ambari.server.api.query

Class JpaPredicateVisitor<T>

java.lang.Object

org.apache.ambari.server.api.query.JpaPredicateVisitor<T>

All Implemented Interfaces:

PredicateVisitor

public abstract class JpaPredicateVisitor<T>
extends Object
implements PredicateVisitor

The JpaPredicateVisitor is used to convert an Ambari Predicate into a JPA Predicate.

Constructor Summary

Constructors

Constructor and Description
JpaPredicateVisitor(javax.persistence.EntityManager entityManager, Class<T> entityClass) Constructor.

Method Summary

Modifier and Type	Method and Description
void	acceptAlwaysPredicate(AlwaysPredicate predicate)
void	acceptArrayPredicate(ArrayPredicate predicate)
void	acceptCategoryPredicate(CategoryPredicate predicate)
void	acceptComparisonPredicate(ComparisonPredicate predicate)
void	acceptUnaryPredicate(UnaryPredicate predicate)
javax.persistence.criteria.CriteriaBuilder	getCriteriaBuilder() Gets the criteria builder used to construct the query and predicates.
javax.persistence.criteria.CriteriaQuery<T>	getCriteriaQuery() Gets the query to use along with getJpaPredicate().
abstract Class<T>	getEntityClass() Gets the entity class that is the root type in the JPA from clause.
javax.persistence.criteria.Predicate	getJpaPredicate() Gets the final JPA Predicate after the visitor is done traversing the Ambari Predicate.
abstract List<? extends javax.persistence.metamodel.SingularAttribute<?,?>>	getPredicateMapping(String propertyId) Gets the SingularAttributes mapped to the specified Ambari-style property.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JpaPredicateVisitor

public JpaPredicateVisitor(javax.persistence.EntityManager entityManager,
                           Class<T> entityClass)

Constructor.

Parameters:

entityManager - the EM used to get a CriteriaBuilder.

entityClass - the entity class being queried from.

Method Detail

getEntityClass

public abstract Class<T> getEntityClass()

Gets the entity class that is the root type in the JPA from clause.

Returns:

the entity class (not null).

getPredicateMapping

public abstract List<? extends javax.persistence.metamodel.SingularAttribute<?,?>> getPredicateMapping(String propertyId)

Gets the SingularAttributes mapped to the specified Ambari-style property.

Parameters:

propertyId - the Ambari-style property (not null).

Returns:

the SingularAttribute, or null if no mapping exists.

getJpaPredicate

public javax.persistence.criteria.Predicate getJpaPredicate()

Gets the final JPA Predicate after the visitor is done traversing the Ambari Predicate.

Returns:

the predicate, or null if none.

getCriteriaQuery

public javax.persistence.criteria.CriteriaQuery<T> getCriteriaQuery()

Gets the query to use along with getJpaPredicate().

Returns:

the query (not null).

getCriteriaBuilder

public javax.persistence.criteria.CriteriaBuilder getCriteriaBuilder()

Gets the criteria builder used to construct the query and predicates.

Returns:

the builder (never null).

acceptComparisonPredicate

public void acceptComparisonPredicate(ComparisonPredicate predicate)

Specified by:

acceptComparisonPredicate in interface PredicateVisitor

acceptArrayPredicate

public void acceptArrayPredicate(ArrayPredicate predicate)

Specified by:

acceptArrayPredicate in interface PredicateVisitor

acceptUnaryPredicate

public void acceptUnaryPredicate(UnaryPredicate predicate)

Specified by:

acceptUnaryPredicate in interface PredicateVisitor

acceptAlwaysPredicate

public void acceptAlwaysPredicate(AlwaysPredicate predicate)

Specified by:

acceptAlwaysPredicate in interface PredicateVisitor

acceptCategoryPredicate

public void acceptCategoryPredicate(CategoryPredicate predicate)

Specified by:

acceptCategoryPredicate in interface PredicateVisitor