/* $Id: ObjectLoaderHelper.java 19839 2010-06-28 18:44:09Z epbernard $
*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009, Red Hat, Inc. and/or its affiliates 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.search.engine;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import org.slf4j.Logger;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Disjunction;
import org.hibernate.criterion.Restrictions;
import org.hibernate.search.util.HibernateHelper;
import org.hibernate.search.util.LoggerFactory;
/**
* @author Emmanuel Bernard
*/
public class ObjectLoaderHelper {
private static final int MAX_IN_CLAUSE = 500;
private static final Logger log = LoggerFactory.make();
public static Object load(EntityInfo entityInfo, Session session) {
//be sure to get an initialized object but save from ONFE and ENFE
Object maybeProxy = session.load( entityInfo.clazz, entityInfo.id );
try {
HibernateHelper.initialize( maybeProxy );
}
catch (RuntimeException e) {
if ( LoaderHelper.isObjectNotFoundException( e ) ) {
log.debug( "Object found in Search index but not in database: {} with id {}",
entityInfo.clazz, entityInfo.id );
maybeProxy = null;
}
else {
throw e;
}
}
return maybeProxy;
}
public static void initializeObjects(EntityInfo[] entityInfos,
Criteria criteria, Class<?> entityType,
SearchFactoryImplementor searchFactoryImplementor) {
final int maxResults = entityInfos.length;
if ( maxResults == 0 ) return;
Set<Class<?>> indexedEntities = searchFactoryImplementor.getIndexedTypesPolymorphic( new Class<?>[]{entityType} );
DocumentBuilderIndexedEntity<?> builder = searchFactoryImplementor.getDocumentBuilderIndexedEntity( indexedEntities.iterator().next() );
String idName = builder.getIdentifierName();
Disjunction disjunction = Restrictions.disjunction();
int loop = maxResults / MAX_IN_CLAUSE;
boolean exact = maxResults % MAX_IN_CLAUSE == 0;
if ( !exact ) loop++;
for (int index = 0; index < loop; index++) {
int max = index * MAX_IN_CLAUSE + MAX_IN_CLAUSE <= maxResults ?
index * MAX_IN_CLAUSE + MAX_IN_CLAUSE :
maxResults;
List<Serializable> ids = new ArrayList<Serializable>( max - index * MAX_IN_CLAUSE );
for (int entityInfoIndex = index * MAX_IN_CLAUSE; entityInfoIndex < max; entityInfoIndex++) {
ids.add( entityInfos[entityInfoIndex].id );
}
disjunction.add( Restrictions.in( idName, ids ) );
}
criteria.add( disjunction );
criteria.list(); //load all objects
}
public static List returnAlreadyLoadedObjectsInCorrectOrder(EntityInfo[] entityInfos, Session session) {
//mandatory to keep the same ordering
List result = new ArrayList( entityInfos.length );
for (EntityInfo entityInfo : entityInfos) {
Object element = session.load( entityInfo.clazz, entityInfo.id );
if ( HibernateHelper.isInitialized( element ) ) {
//all existing elements should have been loaded by the query,
//the other ones are missing ones
result.add( element );
}
else {
if ( log.isDebugEnabled() ) {
log.debug( "Object found in Search index but not in database: {} with {}",
entityInfo.clazz, entityInfo.id );
}
}
}
return result;
}
}