Module org.eclipse.persistence.jpa

Package org.eclipse.persistence.internal.jpa.querydef

Class CommonAbstractCriteriaImpl<T>

java.lang.Object

org.eclipse.persistence.internal.jpa.querydef.CommonAbstractCriteriaImpl<T>

All Implemented Interfaces:

CommonAbstractCriteria, Serializable

Direct Known Subclasses:

AbstractQueryImpl, CriteriaDeleteImpl, CriteriaUpdateImpl

public abstract class CommonAbstractCriteriaImpl<T>
extends Object
implements CommonAbstractCriteria, Serializable

Purpose: Contains the implementation of the CommonAbstractCriteria interface of the JPA criteria API.

Description: This is the container class for the components that define a query. This is the superclass of CriteriaQuery, SubQuery, CriteriaDelete and CriteriaUpdate.

Since:

EclipseLink 2.5

See Also:

• CommonAbstractCriteria
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Metamodel	metamodel
protected Set<ParameterExpression<?>>	parameters
protected CriteriaBuilderImpl	queryBuilder
protected Class<T>	queryType
protected Expression<Boolean>	where

Constructor Summary

Constructors

Constructor	Description
CommonAbstractCriteriaImpl(Metamodel metamodel, CriteriaBuilderImpl queryBuilder, Class<T> resultType)

Method Summary

Modifier and Type	Method	Description
void	addParameter(ParameterExpression<?> parameter)
protected void	findRootAndParameters(Expression<?> predicate)
protected void	findRootAndParameters(Order order)
protected abstract Expression	getBaseExpression()
protected abstract DatabaseQuery	getDatabaseQuery()
Set<ParameterExpression<?>>	getParameters()	Return the parameters of the query
Predicate	getRestriction()	Return the predicate that corresponds to the where clause restriction(s).
Class<T>	getResultType()	Return the result type of the query.
protected abstract void	integrateRoot(RootImpl root)	Used to use a root from a different query.
Root	internalFrom(EntityType entity)	Add a query root corresponding to the given entity, forming a Cartesian product with any existing roots.
Root	internalFrom(Class<?> entityClass)	Add a query root corresponding to the given entity, forming a Cartesian product with any existing roots.
<U> Subquery<U>	subquery(Class<U> type)	Specify that the query is to be used as a subquery having the specified return type.
DatabaseQuery	translate()	Translates from the criteria query to a EclipseLink Database Query.
CommonAbstractCriteria	where(Expression<Boolean> restriction)	Modify the query to restrict the query results according to the specified boolean expression.
CommonAbstractCriteria	where(Predicate... restrictions)	Modify the query to restrict the query results according to the conjunction of the specified restriction predicates.

Methods inherited from class java.lang.Object

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

Field Details

metamodel

protected Metamodel metamodel

where

protected Expression<Boolean> where

queryBuilder

protected CriteriaBuilderImpl queryBuilder

queryType

protected Class<T> queryType

parameters

protected Set<ParameterExpression<?>> parameters

Constructor Details

CommonAbstractCriteriaImpl

public CommonAbstractCriteriaImpl(Metamodel metamodel,
 CriteriaBuilderImpl queryBuilder,
 Class<T> resultType)

Method Details

getRestriction

public Predicate getRestriction()

Return the predicate that corresponds to the where clause restriction(s).

Specified by:

getRestriction in interface CommonAbstractCriteria

Returns:

where clause predicate

getResultType

public Class<T> getResultType()

Return the result type of the query. If a result type was specified as an argument to the createQuery method, that type will be returned. If the query was created using the createTupleQuery method, the result type is Tuple. Otherwise, the result type is Object.

Returns:

result type

internalFrom

public Root internalFrom(EntityType entity)

Add a query root corresponding to the given entity, forming a Cartesian product with any existing roots.

Parameters:

entity - metamodel entity representing the entity of type X

Returns:

query root corresponding to the given entity

internalFrom

public Root internalFrom(Class<?> entityClass)

Add a query root corresponding to the given entity, forming a Cartesian product with any existing roots.

Parameters:

entityClass - the entity class

Returns:

query root corresponding to the given entity

where

public CommonAbstractCriteria where(Expression<Boolean> restriction)

Modify the query to restrict the query results according to the specified boolean expression. Replaces the previously added restriction(s), if any.

Parameters:

restriction - a simple or compound boolean expression

Returns:

the modified query

where

public CommonAbstractCriteria where(Predicate... restrictions)

Modify the query to restrict the query results according to the conjunction of the specified restriction predicates. Replaces the previously added restriction(s), if any. If no restrictions are specified, any previously added restrictions are simply removed.

Parameters:

restrictions - zero or more restriction predicates

Returns:

the modified query

subquery

public <U> Subquery<U> subquery(Class<U> type)

Specify that the query is to be used as a subquery having the specified return type.

Specified by:

subquery in interface CommonAbstractCriteria

Returns:

subquery corresponding to the query

integrateRoot

protected abstract void integrateRoot(RootImpl root)

Used to use a root from a different query.

findRootAndParameters

protected void findRootAndParameters(Expression<?> predicate)

findRootAndParameters

protected void findRootAndParameters(Order order)

getBaseExpression

protected abstract Expression getBaseExpression()

addParameter

public void addParameter(ParameterExpression<?> parameter)

getDatabaseQuery

protected abstract DatabaseQuery getDatabaseQuery()

getParameters

public Set<ParameterExpression<?>> getParameters()

Return the parameters of the query

Returns:

the query parameters

translate

public DatabaseQuery translate()

Translates from the criteria query to a EclipseLink Database Query.