//$Id: PersisterFactory.java 11398 2007-04-10 14:54:07Z steve.ebersole@jboss.com $
package org.hibernate.persister;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.cache.access.EntityRegionAccessStrategy;
import org.hibernate.cache.access.CollectionRegionAccessStrategy;
import org.hibernate.cfg.Configuration;
import org.hibernate.engine.Mapping;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.mapping.Collection;
import org.hibernate.mapping.PersistentClass;
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;
/**
* Factory for <tt>EntityPersister</tt> and <tt>CollectionPersister</tt> instances
*
* @author Gavin King
*/
public final class PersisterFactory {
//TODO: make EntityPersister *not* depend on SessionFactoryImplementor
//interface, if possible
// TODO : still need to make CollectionPersisters EntityMode-aware
private PersisterFactory() {}
private static final Class[] PERSISTER_CONSTRUCTOR_ARGS = new Class[] {
PersistentClass.class, EntityRegionAccessStrategy.class, SessionFactoryImplementor.class, Mapping.class
};
// TODO: is it really neceassry to provide Configuration to CollectionPersisters ? Should it not be enough with associated class ?
// or why does EntityPersister's not get access to configuration ?
//
// The only reason I could see that Configuration gets passed to collection persisters
// is so that they can look up the dom4j node name of the entity element in case
// no explicit node name was applied at the collection element level. Are you kidding me?
// Trivial to fix then. Just store and expose the node name on the entity persister
// (which the collection persister looks up anyway via other means...).
private static final Class[] COLLECTION_PERSISTER_CONSTRUCTOR_ARGS = new Class[] {
Collection.class, CollectionRegionAccessStrategy.class, Configuration.class, SessionFactoryImplementor.class
};
public static EntityPersister createClassPersister(
PersistentClass model,
EntityRegionAccessStrategy cacheAccessStrategy,
SessionFactoryImplementor factory,
Mapping cfg) throws HibernateException {
Class persisterClass = model.getEntityPersisterClass();
if ( persisterClass == null || persisterClass == SingleTableEntityPersister.class ) {
return new SingleTableEntityPersister( model, cacheAccessStrategy, factory, cfg );
}
else if ( persisterClass == JoinedSubclassEntityPersister.class ) {
return new JoinedSubclassEntityPersister( model, cacheAccessStrategy, factory, cfg );
}
else if ( persisterClass == UnionSubclassEntityPersister.class ) {
return new UnionSubclassEntityPersister( model, cacheAccessStrategy, factory, cfg );
}
else {
return create( persisterClass, model, cacheAccessStrategy, factory, cfg );
}
}
public static CollectionPersister createCollectionPersister(
Configuration cfg,
Collection model,
CollectionRegionAccessStrategy cacheAccessStrategy,
SessionFactoryImplementor factory) throws HibernateException {
Class persisterClass = model.getCollectionPersisterClass();
if ( persisterClass == null ) {
return model.isOneToMany()
? ( CollectionPersister ) new OneToManyPersister( model, cacheAccessStrategy, cfg, factory )
: ( CollectionPersister ) new BasicCollectionPersister( model, cacheAccessStrategy, cfg, factory );
}
else {
return create( persisterClass, cfg, model, cacheAccessStrategy, factory );
}
}
private static EntityPersister create(
Class persisterClass,
PersistentClass model,
EntityRegionAccessStrategy cacheAccessStrategy,
SessionFactoryImplementor factory,
Mapping cfg) throws HibernateException {
Constructor pc;
try {
pc = persisterClass.getConstructor( PERSISTER_CONSTRUCTOR_ARGS );
}
catch ( Exception e ) {
throw new MappingException( "Could not get constructor for " + persisterClass.getName(), e );
}
try {
return (EntityPersister) pc.newInstance( new Object[] { model, cacheAccessStrategy, factory, cfg } );
}
catch (InvocationTargetException ite) {
Throwable e = ite.getTargetException();
if (e instanceof HibernateException) {
throw (HibernateException) e;
}
else {
throw new MappingException( "Could not instantiate persister " + persisterClass.getName(), e );
}
}
catch (Exception e) {
throw new MappingException( "Could not instantiate persister " + persisterClass.getName(), e );
}
}
private static CollectionPersister create(
Class persisterClass,
Configuration cfg,
Collection model,
CollectionRegionAccessStrategy cacheAccessStrategy,
SessionFactoryImplementor factory) throws HibernateException {
Constructor pc;
try {
pc = persisterClass.getConstructor( COLLECTION_PERSISTER_CONSTRUCTOR_ARGS );
}
catch (Exception e) {
throw new MappingException( "Could not get constructor for " + persisterClass.getName(), e );
}
try {
return (CollectionPersister) pc.newInstance( new Object[] { model, cacheAccessStrategy, cfg, factory } );
}
catch (InvocationTargetException ite) {
Throwable e = ite.getTargetException();
if (e instanceof HibernateException) {
throw (HibernateException) e;
}
else {
throw new MappingException( "Could not instantiate collection persister " + persisterClass.getName(), e );
}
}
catch (Exception e) {
throw new MappingException( "Could not instantiate collection persister " + persisterClass.getName(), e );
}
}
}