Hibernate example source code file (StandardPersisterClassResolver.java)

This example Hibernate source code file (StandardPersisterClassResolver.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

class, class, collectionpersister, collectionpersister, could, entitypersister, entitypersister, override, override, persisterclassresolver, return, single_table, table_per_class, unknownpersisterexception

The Hibernate StandardPersisterClassResolver.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, 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.persister.internal;

import org.hibernate.mapping.Collection;
import org.hibernate.mapping.JoinedSubclass;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.RootClass;
import org.hibernate.mapping.UnionSubclass;
import org.hibernate.metamodel.binding.CollectionElementNature;
import org.hibernate.metamodel.binding.EntityBinding;
import org.hibernate.metamodel.binding.PluralAttributeBinding;
import org.hibernate.persister.collection.BasicCollectionPersister;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.persister.collection.OneToManyPersister;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.persister.entity.JoinedSubclassEntityPersister;
import org.hibernate.persister.entity.SingleTableEntityPersister;
import org.hibernate.persister.entity.UnionSubclassEntityPersister;
import org.hibernate.persister.spi.PersisterClassResolver;
import org.hibernate.persister.spi.UnknownPersisterException;

/**
 * @author Steve Ebersole
 */
public class StandardPersisterClassResolver implements PersisterClassResolver {

	public Class<? extends EntityPersister> getEntityPersisterClass(EntityBinding metadata) {
		if ( metadata.isRoot() ) {
			return singleTableEntityPersister(); // EARLY RETURN!
		}
		switch ( metadata.getHierarchyDetails().getInheritanceType() ) {
			case JOINED: {
				return joinedSubclassEntityPersister();
			}
			case SINGLE_TABLE: {
				return singleTableEntityPersister();
			}
			case TABLE_PER_CLASS: {
				return unionSubclassEntityPersister();
			}
			default: {
				throw new UnknownPersisterException(
						"Could not determine persister implementation for entity [" + metadata.getEntity().getName() + "]"
				);
			}

		}
	}

	@Override
	public Class<? extends EntityPersister> getEntityPersisterClass(PersistentClass metadata) {
		// todo : make sure this is based on an attribute kept on the metamodel in the new code, not the concrete PersistentClass impl found!
		if ( RootClass.class.isInstance( metadata ) ) {
			return singleTableEntityPersister();
		}
		else if ( JoinedSubclass.class.isInstance( metadata ) ) {
			return joinedSubclassEntityPersister();
		}
		else if ( UnionSubclass.class.isInstance( metadata ) ) {
			return unionSubclassEntityPersister();
		}
		else {
			throw new UnknownPersisterException(
					"Could not determine persister implementation for entity [" + metadata.getEntityName() + "]"
			);
		}
	}

	public Class<? extends EntityPersister> singleTableEntityPersister() {
		return SingleTableEntityPersister.class;
	}

	public Class<? extends EntityPersister> joinedSubclassEntityPersister() {
		return JoinedSubclassEntityPersister.class;
	}

	public Class<? extends EntityPersister> unionSubclassEntityPersister() {
		return UnionSubclassEntityPersister.class;
	}

	@Override
	public Class<? extends CollectionPersister> getCollectionPersisterClass(Collection metadata) {
		return metadata.isOneToMany() ? oneToManyPersister() : basicCollectionPersister();
	}

	@Override
	public Class<? extends CollectionPersister> getCollectionPersisterClass(PluralAttributeBinding metadata) {
		return metadata.getCollectionElement().getCollectionElementNature() == CollectionElementNature.ONE_TO_MANY
				? oneToManyPersister()
				: basicCollectionPersister();
	}

	private Class<OneToManyPersister> oneToManyPersister() {
		return OneToManyPersister.class;
	}

	private Class<BasicCollectionPersister> basicCollectionPersister() {
		return BasicCollectionPersister.class;
	}
}