/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2013, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.loader.plan2.build.internal.returns;
import org.hibernate.loader.PropertyPath;
import org.hibernate.loader.plan2.build.spi.ExpandingCompositeQuerySpace;
import org.hibernate.loader.plan2.build.spi.ExpandingEntityQuerySpace;
import org.hibernate.loader.plan2.spi.CompositeFetch;
import org.hibernate.loader.plan2.spi.EntityIdentifierDescription;
import org.hibernate.loader.plan2.spi.EntityReference;
import org.hibernate.loader.plan2.spi.Join;
import org.hibernate.persister.entity.EntityPersister;
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 Join join = expandingEntityQuerySpace().makeCompositeIdentifierJoin();
return identifierDefinition.isEncapsulated()
? buildEncapsulatedCompositeIdentifierDescription( join )
: buildNonEncapsulatedCompositeIdentifierDescription( join );
}
private NonEncapsulatedEntityIdentifierDescription buildNonEncapsulatedCompositeIdentifierDescription(Join compositeJoin) {
return new NonEncapsulatedEntityIdentifierDescription(
this,
(ExpandingCompositeQuerySpace) compositeJoin.getRightHandSide(),
(CompositeType) getEntityPersister().getIdentifierType(),
getPropertyPath().append( "id" )
);
}
private EncapsulatedEntityIdentifierDescription buildEncapsulatedCompositeIdentifierDescription(Join compositeJoin) {
return new EncapsulatedEntityIdentifierDescription(
this,
(ExpandingCompositeQuerySpace) compositeJoin.getRightHandSide(),
(CompositeType) getEntityPersister().getIdentifierType(),
getPropertyPath().append( "id" )
);
}
@Override
public EntityReference resolveEntityReference() {
return this;
}
@Override
public EntityPersister getEntityPersister() {
return expandingEntityQuerySpace().getEntityPersister();
}
@Override
public EntityIdentifierDescription getIdentifierDescription() {
return identifierDescription;
}
protected CompositeFetch createCompositeFetch(
CompositeType compositeType,
ExpandingCompositeQuerySpace compositeQuerySpace) {
return new CompositeFetchImpl(
this,
compositeType,
compositeQuerySpace,
true,
getPropertyPath()
);
}
}