org.hibernate.transform.AliasToBeanConstructorResultTransformer 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.lang.reflect.Constructor;
import java.util.List;
import org.hibernate.QueryException;
/**
* Wraps the tuples in a constructor call.
*
* todo : why Alias* in the name???
*/
public class AliasToBeanConstructorResultTransformer implements ResultTransformer {
private final Constructor constructor;
/**
* Instantiates a AliasToBeanConstructorResultTransformer.
*
* @param constructor The contructor in which to wrap the tuples.
*/
public AliasToBeanConstructorResultTransformer(Constructor constructor) {
this.constructor = constructor;
}
/**
* Wrap the incoming tuples in a call to our configured constructor.
*/
public Object transformTuple(Object[] tuple, String[] aliases) {
try {
return constructor.newInstance( tuple );
}
catch ( Exception e ) {
throw new QueryException(
"could not instantiate class [" + constructor.getDeclaringClass().getName() + "] from tuple",
e
);
}
}
/**
* {@inheritDoc}
*/
public List transformList(List collection) {
return collection;
}
/**
* Define our hashCode by our defined constructor's hasCode.
*
* @return Our defined ctor hashCode
*/
public int hashCode() {
return constructor.hashCode();
}
/**
* 2 AliasToBeanConstructorResultTransformer are considered equal if they have the same
* defined constructor.
*
* @param other The other instance to check for equality.
* @return True if both have the same defined constuctor; false otherwise.
*/
public boolean equals(Object other) {
return other instanceof AliasToBeanConstructorResultTransformer
&& constructor.equals( ( ( AliasToBeanConstructorResultTransformer ) other ).constructor );
}
}