org.hibernate.loader.plan.build.internal.returns.AbstractEntityReference Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hibernate-core Show documentation
Show all versions of hibernate-core Show documentation
Hibernate's core ORM functionality
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.loader.plan.build.internal.returns;
import org.hibernate.loader.PropertyPath;
import org.hibernate.loader.plan.build.spi.ExpandingCompositeQuerySpace;
import org.hibernate.loader.plan.build.spi.ExpandingEntityQuerySpace;
import org.hibernate.loader.plan.spi.CompositeAttributeFetch;
import org.hibernate.loader.plan.spi.EntityIdentifierDescription;
import org.hibernate.loader.plan.spi.EntityReference;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.persister.walking.spi.AttributeDefinition;
import org.hibernate.persister.walking.spi.EncapsulatedEntityIdentifierDefinition;
import org.hibernate.persister.walking.spi.EntityIdentifierDefinition;
import org.hibernate.type.CompositeType;
import org.hibernate.type.Type;
/**
* @author Steve Ebersole
*/
public abstract class AbstractEntityReference extends AbstractExpandingFetchSource implements EntityReference {
private final EntityIdentifierDescription identifierDescription;
public AbstractEntityReference(
ExpandingEntityQuerySpace entityQuerySpace,
PropertyPath propertyPath) {
super( entityQuerySpace, propertyPath );
this.identifierDescription = buildIdentifierDescription();
}
private ExpandingEntityQuerySpace expandingEntityQuerySpace() {
return (ExpandingEntityQuerySpace) expandingQuerySpace();
}
/**
* Builds just the first level of identifier description. This will be either a simple id descriptor (String,
* Long, etc) or some form of composite id (either encapsulated or not).
*
* @return the descriptor for the identifier
*/
private EntityIdentifierDescription buildIdentifierDescription() {
final EntityIdentifierDefinition identifierDefinition = getEntityPersister().getEntityKeyDefinition();
if ( identifierDefinition.isEncapsulated() ) {
final EncapsulatedEntityIdentifierDefinition encapsulatedIdentifierDefinition = (EncapsulatedEntityIdentifierDefinition) identifierDefinition;
final Type idAttributeType = encapsulatedIdentifierDefinition.getAttributeDefinition().getType();
if ( ! CompositeType.class.isInstance( idAttributeType ) ) {
return new SimpleEntityIdentifierDescriptionImpl();
}
}
// if we get here, we know we have a composite identifier...
final ExpandingCompositeQuerySpace querySpace = expandingEntityQuerySpace().makeCompositeIdentifierQuerySpace();
return identifierDefinition.isEncapsulated()
? buildEncapsulatedCompositeIdentifierDescription( querySpace )
: buildNonEncapsulatedCompositeIdentifierDescription( querySpace );
}
private NonEncapsulatedEntityIdentifierDescription buildNonEncapsulatedCompositeIdentifierDescription(
ExpandingCompositeQuerySpace compositeQuerySpace) {
return new NonEncapsulatedEntityIdentifierDescription(
this,
compositeQuerySpace,
(CompositeType) getEntityPersister().getIdentifierType(),
getPropertyPath().append( EntityPersister.ENTITY_ID )
);
}
private EncapsulatedEntityIdentifierDescription buildEncapsulatedCompositeIdentifierDescription(
ExpandingCompositeQuerySpace compositeQuerySpace) {
return new EncapsulatedEntityIdentifierDescription(
this,
compositeQuerySpace,
(CompositeType) getEntityPersister().getIdentifierType(),
getPropertyPath().append( EntityPersister.ENTITY_ID )
);
}
@Override
public EntityReference resolveEntityReference() {
return this;
}
@Override
public EntityPersister getEntityPersister() {
return expandingEntityQuerySpace().getEntityPersister();
}
@Override
public EntityIdentifierDescription getIdentifierDescription() {
return identifierDescription;
}
protected CompositeAttributeFetch createCompositeAttributeFetch(
AttributeDefinition attributeDefinition,
ExpandingCompositeQuerySpace compositeQuerySpace) {
return new CompositeAttributeFetchImpl(
this,
attributeDefinition,
compositeQuerySpace,
true
);
}
}