org.openxava.model.PersistenceFacade Maven / Gradle / Ivy
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package org.openxava.model;
import org.openxava.model.meta.*;
/**
* To access to some persistence services in an abstract way.
*
* We need this class to write some code in OpenXava that works in the same
* way if we are using Hibernate or EJB3 JPA (or other persistence technology).
*
* This class can be used in custom application code, although for this case
* maybe it's better to use directly the EJB3 JPA (or Hibernate) API.
*
* This class uses the underlayer persistence provider associated to
* the corresponding entity.
*
* If the methods fail they throw RuntimeException, the specific
* RuntimeException depends on the implementation technology.
*
* @author Javier Paniza
*/
public class PersistenceFacade {
/**
* Refresh the state of the instance from the database,
* overwriting changes made to the entity, if any.
* If the object is null or it's not managed simply do nothing,
* but not fails.
*/
public static void refreshIfManaged(Object object) {
if (object == null) return;
MetaModel.getForPOJO(object).getMetaComponent().getPersistenceProvider().refreshIfManaged(object);
}
}