Package de.xima.fc.dao.utils

Class CriteriaApiHelper

java.lang.Object

de.xima.fc.dao.utils.CriteriaApiHelper

public class CriteriaApiHelper
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CriteriaApiHelper.DeleteCtx<QT>	Wraps the EntityManager provided by the entity context, a CriteriaBuilder and a CriteriaDelete.
static class	CriteriaApiHelper.SelectCtx<QT>	Wraps the EntityManager provided by the entity context, a CriteriaBuilder and a CriteriaQuery.
static class	CriteriaApiHelper.UpdateCtx<QT>	Wraps the EntityManager provided by the entity context, a CriteriaBuilder and a CriteriaUpdate.

Constructor Summary

Constructors

Constructor	Description
CriteriaApiHelper()

Method Summary

Modifier and Type	Method	Description
static javax.persistence.criteria.Predicate	andCombinePredicates(javax.persistence.criteria.CriteriaBuilder cb, javax.persistence.criteria.Predicate... predicates)	Combines multiple predicates with an AND operation.
static <QT> CriteriaApiHelper.DeleteCtx<QT>	deleteCtx(IEntityContext ec)	Creates a 'delete context' from the provided entity context.
static javax.persistence.criteria.Predicate	orCombinePredicates(javax.persistence.criteria.CriteriaBuilder cb, javax.persistence.criteria.Predicate... predicates)	Combines multiple predicates into a single OR predicate.
static <QT> CriteriaApiHelper.SelectCtx<QT>	selectCtx(IEntityContext ec)	Creates a 'select context' from the provided entity context.
static <QT> CriteriaApiHelper.SelectCtx<QT>	selectCtx(IEntityContext ec, Function<javax.persistence.criteria.CriteriaBuilder,javax.persistence.criteria.CriteriaQuery<QT>> cqFunc)	Creates a 'select context' from the provided entity context.
static <QT> CriteriaApiHelper.UpdateCtx<QT>	updateCtx(IEntityContext ec)	Creates an 'update context' from the provided entity context.

Methods inherited from class java.lang.Object

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

Constructor Detail

CriteriaApiHelper

public CriteriaApiHelper()

Method Detail

andCombinePredicates

public static javax.persistence.criteria.Predicate andCombinePredicates(javax.persistence.criteria.CriteriaBuilder cb,
                                                                        javax.persistence.criteria.Predicate... predicates)

Combines multiple predicates with an AND operation.

Parameters:

cb - Criteria builder

predicates - Predicates to combine

Returns:

Combined predicate

orCombinePredicates

public static javax.persistence.criteria.Predicate orCombinePredicates(javax.persistence.criteria.CriteriaBuilder cb,
                                                                       javax.persistence.criteria.Predicate... predicates)

Combines multiple predicates into a single OR predicate.

Parameters:

predicates - Predicates to combine

cb - Criteria builder

Returns:

Combined OR predicate

selectCtx

public static <QT> CriteriaApiHelper.SelectCtx<QT> selectCtx(IEntityContext ec)

Creates a 'select context' from the provided entity context.

Type Parameters:

QT - the query type (usually the type of the entity to query).

Parameters:

ec - the entity context to use

Returns:

the resulting CriteriaApiHelper.SelectCtx (wrapping the EntityManager provided by the entity context, a CriteriaBuilder and a CriteriaQuery).

selectCtx

public static <QT> CriteriaApiHelper.SelectCtx<QT> selectCtx(IEntityContext ec,
                                                             Function<javax.persistence.criteria.CriteriaBuilder,javax.persistence.criteria.CriteriaQuery<QT>> cqFunc)

Creates a 'select context' from the provided entity context.

Type Parameters:

QT - the query type.

Parameters:

ec - the entity context to use

cqFunc - function to create the criteria query (for cases where the criteria query's type is not entity based, e.g. when querying attributes using a multiselect and tuple query).

Returns:

the resulting CriteriaApiHelper.SelectCtx (wrapping the EntityManager provided by the entity context, a CriteriaBuilder and a CriteriaQuery).

deleteCtx

public static <QT> CriteriaApiHelper.DeleteCtx<QT> deleteCtx(IEntityContext ec)

Creates a 'delete context' from the provided entity context.

Type Parameters:

QT - the query type (usually the type of the entity to delete).

Parameters:

ec - the entity context to use

Returns:

the resulting CriteriaApiHelper.SelectCtx (wrapping the EntityManager provided by the entity context, a CriteriaBuilder and a CriteriaDelete).

updateCtx

public static <QT> CriteriaApiHelper.UpdateCtx<QT> updateCtx(IEntityContext ec)

Creates an 'update context' from the provided entity context.

Type Parameters:

QT - the query type (usually the type of the entity to update).

Parameters:

ec - the entity context to use

Returns:

the resulting CriteriaApiHelper.SelectCtx (wrapping the EntityManager provided by the entity context, a CriteriaBuilder and an CriteriaUpdate).