org.hibernate.transform.ResultTransformer Maven / Gradle / Ivy
/*
* 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.transform;
import java.io.Serializable;
import java.util.List;
/**
* Implementors define a strategy for transforming query results into the
* actual application-visible query result list.
*
* @see org.hibernate.Criteria#setResultTransformer(ResultTransformer)
* @see org.hibernate.Query#setResultTransformer(ResultTransformer)
*
* @author Gavin King
*/
public interface ResultTransformer extends Serializable {
/**
* Tuples are the elements making up each "row" of the query result.
* The contract here is to transform these elements into the final
* row.
*
* @param tuple The result elements
* @param aliases The result aliases ("parallel" array to tuple)
* @return The transformed row.
*/
public Object transformTuple(Object[] tuple, String[] aliases);
/**
* Here we have an opportunity to perform transformation on the
* query result as a whole. This might be useful to convert from
* one collection type to another or to remove duplicates from the
* result, etc.
*
* @param collection The result.
* @return The transformed result.
*/
public List transformList(List collection);
}