//$Id: VersionType.java 7736 2005-08-03 20:03:34Z steveebersole $
package org.hibernate.type;
import java.util.Comparator;
import org.hibernate.engine.SessionImplementor;
/**
* A <tt>Type</tt> that may be used to version data.
* @author Gavin King
*/
public interface VersionType extends Type {
/**
* Generate an initial version.
*
* @param session The session from which this request originates.
* @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);
/**
* Get a comparator for version values.
*
* @return The comparator to use to compare different version values.
*/
public Comparator getComparator();
/**
* Are the two version values considered equal?
*
* @param x One value to check.
* @param y The other value to check.
* @return true if the values are equal, false otherwise.
*/
public boolean isEqual(Object x, Object y);
}
|