/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
*
* 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.hql.internal;
import java.lang.reflect.Constructor;
import org.hibernate.transform.AliasToBeanConstructorResultTransformer;
import org.hibernate.transform.ResultTransformer;
import org.hibernate.transform.Transformers;
/**
* @author Gavin King
*/
public final class HolderInstantiator {
public static final HolderInstantiator NOOP_INSTANTIATOR = new HolderInstantiator(null,null);
private final ResultTransformer transformer;
private final String[] queryReturnAliases;
public static HolderInstantiator getHolderInstantiator(ResultTransformer selectNewTransformer, ResultTransformer customTransformer, String[] queryReturnAliases) {
return new HolderInstantiator(
resolveResultTransformer( selectNewTransformer, customTransformer ),
queryReturnAliases
);
}
public static ResultTransformer resolveResultTransformer(ResultTransformer selectNewTransformer, ResultTransformer customTransformer) {
return selectNewTransformer != null ? selectNewTransformer : customTransformer;
}
public static ResultTransformer createSelectNewTransformer(Constructor constructor, boolean returnMaps, boolean returnLists) {
if ( constructor != null ) {
return new AliasToBeanConstructorResultTransformer(constructor);
}
else if ( returnMaps ) {
return Transformers.ALIAS_TO_ENTITY_MAP;
}
else if ( returnLists ) {
return Transformers.TO_LIST;
}
else {
return null;
}
}
static public HolderInstantiator createClassicHolderInstantiator(Constructor constructor,
ResultTransformer transformer) {
return new HolderInstantiator( resolveClassicResultTransformer( constructor, transformer ), null );
}
static public ResultTransformer resolveClassicResultTransformer(
Constructor constructor,
ResultTransformer transformer) {
return constructor != null ? new AliasToBeanConstructorResultTransformer( constructor ) : transformer;
}
public HolderInstantiator(
ResultTransformer transformer,
String[] queryReturnAliases
) {
this.transformer = transformer;
this.queryReturnAliases = queryReturnAliases;
}
public boolean isRequired() {
return transformer!=null;
}
public Object instantiate(Object[] row) {
if(transformer==null) {
return row;
} else {
return transformer.transformTuple(row, queryReturnAliases);
}
}
public String[] getQueryReturnAliases() {
return queryReturnAliases;
}
public ResultTransformer getResultTransformer() {
return transformer;
}
}