//$Id: UserVersionType.java 7736 2005-08-03 20:03:34Z steveebersole $
package org.hibernate.usertype;
import java.util.Comparator;
import org.hibernate.engine.SessionImplementor;
/**
* A user type that may be used for a version property
*
* @author Gavin King
*/
public interface UserVersionType extends UserType, Comparator {
/**
* Generate an initial version.
*
* @param session The session from which this request originates. May be
* null; currently this only happens during startup when trying to determine
* the "unsaved value" of entities.
* @return an instance of the type
*/
public Object seed(SessionImplementor session);
/**
* Increment the version.
*
* @param session The session from which this request originates.
* @param current the current version
* @return an instance of the type
*/
public Object next(Object current, SessionImplementor session);
}
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