Hibernate example source code file (DefaultAuditStrategy.java)

This example Hibernate source code file (DefaultAuditStrategy.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

auditconfiguration, defaultauditstrategy, io, middlecomponentdata, middleiddata, object, object, parameters, parameters, persistentcollectionchangedata, querybuilder, querybuilder, serializable, string, string

The Hibernate DefaultAuditStrategy.java source code

package org.hibernate.envers.strategy;
import java.io.Serializable;
import org.hibernate.Session;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.configuration.GlobalConfiguration;
import org.hibernate.envers.entities.mapper.PersistentCollectionChangeData;
import org.hibernate.envers.entities.mapper.relation.MiddleComponentData;
import org.hibernate.envers.entities.mapper.relation.MiddleIdData;
import org.hibernate.envers.tools.query.Parameters;
import org.hibernate.envers.tools.query.QueryBuilder;

/**
 * Default strategy is to simply persist the audit data.
 *
 * @author Adam Warski
 * @author Stephanie Pau
 */
public class DefaultAuditStrategy implements AuditStrategy {
    public void perform(Session session, String entityName, AuditConfiguration auditCfg, Serializable id, Object data,
                        Object revision) {
        session.save(auditCfg.getAuditEntCfg().getAuditEntityName(entityName), data);
    }

    public void performCollectionChange(Session session, AuditConfiguration auditCfg,
                                        PersistentCollectionChangeData persistentCollectionChangeData, Object revision) {
        session.save(persistentCollectionChangeData.getEntityName(), persistentCollectionChangeData.getData());
    }

    
	public void addEntityAtRevisionRestriction(GlobalConfiguration globalCfg, QueryBuilder rootQueryBuilder, String revisionProperty,
			String revisionEndProperty, boolean addAlias, MiddleIdData idData, String revisionPropertyPath, 
			String originalIdPropertyName, String alias1, String alias2) {
		Parameters rootParameters = rootQueryBuilder.getRootParameters();
		
		// create a subquery builder
        // SELECT max(e.revision) FROM versionsReferencedEntity e2
        QueryBuilder maxERevQb = rootQueryBuilder.newSubQueryBuilder(idData.getAuditEntityName(), alias2);
        maxERevQb.addProjection("max", revisionPropertyPath, false);
        // WHERE
        Parameters maxERevQbParameters = maxERevQb.getRootParameters();
        // e2.revision <= :revision
        maxERevQbParameters.addWhereWithNamedParam(revisionPropertyPath, "<=", "revision");
        // e2.id_ref_ed = e.id_ref_ed
        idData.getOriginalMapper().addIdsEqualToQuery(maxERevQbParameters,
                alias1 + "." + originalIdPropertyName, alias2 +"." + originalIdPropertyName);
		
		// add subquery to rootParameters
        String subqueryOperator = globalCfg.getCorrelatedSubqueryOperator();
		rootParameters.addWhere(revisionProperty, addAlias, subqueryOperator, maxERevQb);
	}

	public void addAssociationAtRevisionRestriction(QueryBuilder rootQueryBuilder,  String revisionProperty, 
	          String revisionEndProperty, boolean addAlias, MiddleIdData referencingIdData, String versionsMiddleEntityName,
	          String eeOriginalIdPropertyPath, String revisionPropertyPath,
	          String originalIdPropertyName, MiddleComponentData... componentDatas) {
		Parameters rootParameters = rootQueryBuilder.getRootParameters();

    	// SELECT max(ee2.revision) FROM middleEntity ee2
        QueryBuilder maxEeRevQb = rootQueryBuilder.newSubQueryBuilder(versionsMiddleEntityName, "ee2");
        maxEeRevQb.addProjection("max", revisionPropertyPath, false);
        // WHERE
        Parameters maxEeRevQbParameters = maxEeRevQb.getRootParameters();
        // ee2.revision <= :revision
        maxEeRevQbParameters.addWhereWithNamedParam(revisionPropertyPath, "<=", "revision");
        // ee2.originalId.* = ee.originalId.*
        String ee2OriginalIdPropertyPath = "ee2." + originalIdPropertyName;
        referencingIdData.getPrefixedMapper().addIdsEqualToQuery(maxEeRevQbParameters, eeOriginalIdPropertyPath, ee2OriginalIdPropertyPath);
        for (MiddleComponentData componentData : componentDatas) {
            componentData.getComponentMapper().addMiddleEqualToQuery(maxEeRevQbParameters, eeOriginalIdPropertyPath, ee2OriginalIdPropertyPath);
        }

		// add subquery to rootParameters
        rootParameters.addWhere(revisionProperty, addAlias, "=", maxEeRevQb);
	}

}