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The core O/RM functionality as provided by Hibernate
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.type;
import java.util.Comparator;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
/**
* Additional contract for types which may be used to version (and optimistic lock) data.
*
* @author Gavin King
* @author Steve Ebersole
*/
public interface VersionType extends Type {
/**
* Generate an initial version.
*
* @param session The session from which this request originates.
* @return an instance of the type
*/
T seed(SharedSessionContractImplementor session);
/**
* Increment the version.
*
* @param session The session from which this request originates.
* @param current the current version
* @return an instance of the type
*/
T next(T current, SharedSessionContractImplementor session);
/**
* Get a comparator for version values.
*
* @return The comparator to use to compare different version values.
*/
Comparator getComparator();
}