//$Id: HolderInstantiator.java 9636 2006-03-16 14:14:48Z max.andersen@jboss.com $
package org.hibernate.hql;
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) {
if(selectNewTransformer!=null) {
return new HolderInstantiator(selectNewTransformer, queryReturnAliases);
} else {
return new HolderInstantiator(customTransformer, queryReturnAliases);
}
}
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) {
if ( constructor != null ) {
return new HolderInstantiator(new AliasToBeanConstructorResultTransformer(constructor), null);
}
else {
return new HolderInstantiator(transformer, null);
}
}
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;
}
}