/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2013, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.envers.internal.entities.mapper.relation.query;
import org.hibernate.envers.configuration.internal.AuditEntitiesConfiguration;
import org.hibernate.envers.internal.entities.mapper.relation.MiddleComponentData;
import org.hibernate.envers.internal.entities.mapper.relation.MiddleIdData;
import org.hibernate.envers.internal.tools.query.Parameters;
import org.hibernate.envers.internal.tools.query.QueryBuilder;
import org.hibernate.envers.strategy.AuditStrategy;
import static org.hibernate.envers.internal.entities.mapper.relation.query.QueryConstants.DEL_REVISION_TYPE_PARAMETER;
import static org.hibernate.envers.internal.entities.mapper.relation.query.QueryConstants.MIDDLE_ENTITY_ALIAS;
import static org.hibernate.envers.internal.entities.mapper.relation.query.QueryConstants.REFERENCED_ENTITY_ALIAS;
import static org.hibernate.envers.internal.entities.mapper.relation.query.QueryConstants.REVISION_PARAMETER;
/**
* Selects data from a relation middle-table and a related non-audited entity.
*
* @author Adam Warski (adam at warski dot org)
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
*/
public final class TwoEntityOneAuditedQueryGenerator extends AbstractRelationQueryGenerator {
private final String queryString;
private final String queryRemovedString;
public TwoEntityOneAuditedQueryGenerator(
AuditEntitiesConfiguration verEntCfg, AuditStrategy auditStrategy,
String versionsMiddleEntityName, MiddleIdData referencingIdData,
MiddleIdData referencedIdData, boolean revisionTypeInId,
MiddleComponentData... componentData) {
super( verEntCfg, referencingIdData, revisionTypeInId );
/*
* The valid query that we need to create:
* SELECT new list(ee, e) FROM referencedEntity e, middleEntity ee
* WHERE
* (entities referenced by the middle table; id_ref_ed = id of the referenced entity)
* ee.id_ref_ed = e.id_ref_ed AND
* (only entities referenced by the association; id_ref_ing = id of the referencing entity)
* ee.id_ref_ing = :id_ref_ing AND
*
* (the association at revision :revision)
* --> for DefaultAuditStrategy:
* ee.revision = (SELECT max(ee2.revision) FROM middleEntity ee2
* WHERE ee2.revision <= :revision AND ee2.originalId.* = ee.originalId.*)
*
* --> for ValidityAuditStrategy:
* ee.revision <= :revision and (ee.endRevision > :revision or ee.endRevision is null)
*
* AND
*
* (only non-deleted entities and associations)
* ee.revision_type != DEL
*/
final QueryBuilder commonPart = commonQueryPart(
referencedIdData,
versionsMiddleEntityName,
verEntCfg.getOriginalIdPropName()
);
final QueryBuilder validQuery = commonPart.deepCopy();
final QueryBuilder removedQuery = commonPart.deepCopy();
createValidDataRestrictions(
auditStrategy, versionsMiddleEntityName, validQuery, validQuery.getRootParameters(), componentData
);
createValidAndRemovedDataRestrictions( auditStrategy, versionsMiddleEntityName, removedQuery, componentData );
queryString = queryToString( validQuery );
queryRemovedString = queryToString( removedQuery );
}
/**
* Compute common part for both queries.
*/
private QueryBuilder commonQueryPart(
MiddleIdData referencedIdData, String versionsMiddleEntityName,
String originalIdPropertyName) {
final String eeOriginalIdPropertyPath = MIDDLE_ENTITY_ALIAS + "." + originalIdPropertyName;
// SELECT new list(ee) FROM middleEntity ee
final QueryBuilder qb = new QueryBuilder( versionsMiddleEntityName, MIDDLE_ENTITY_ALIAS );
qb.addFrom( referencedIdData.getEntityName(), REFERENCED_ENTITY_ALIAS );
qb.addProjection( "new list", MIDDLE_ENTITY_ALIAS + ", " + REFERENCED_ENTITY_ALIAS, false, false );
// WHERE
final Parameters rootParameters = qb.getRootParameters();
// ee.id_ref_ed = e.id_ref_ed
referencedIdData.getPrefixedMapper().addIdsEqualToQuery(
rootParameters, eeOriginalIdPropertyPath, referencedIdData.getOriginalMapper(), REFERENCED_ENTITY_ALIAS
);
// ee.originalId.id_ref_ing = :id_ref_ing
referencingIdData.getPrefixedMapper().addNamedIdEqualsToQuery( rootParameters, originalIdPropertyName, true );
return qb;
}
/**
* Creates query restrictions used to retrieve only actual data.
*/
private void createValidDataRestrictions(
AuditStrategy auditStrategy, String versionsMiddleEntityName, QueryBuilder qb,
Parameters rootParameters, MiddleComponentData... componentData) {
final String revisionPropertyPath = verEntCfg.getRevisionNumberPath();
final String originalIdPropertyName = verEntCfg.getOriginalIdPropName();
final String eeOriginalIdPropertyPath = MIDDLE_ENTITY_ALIAS + "." + originalIdPropertyName;
// (with ee association at revision :revision)
// --> based on auditStrategy (see above)
auditStrategy.addAssociationAtRevisionRestriction(
qb, rootParameters, revisionPropertyPath, verEntCfg.getRevisionEndFieldName(), true,
referencingIdData, versionsMiddleEntityName, eeOriginalIdPropertyPath, revisionPropertyPath,
originalIdPropertyName, MIDDLE_ENTITY_ALIAS, true, componentData
);
// ee.revision_type != DEL
rootParameters.addWhereWithNamedParam( getRevisionTypePath(), "!=", DEL_REVISION_TYPE_PARAMETER );
}
/**
* Create query restrictions used to retrieve actual data and deletions that took place at exactly given revision.
*/
private void createValidAndRemovedDataRestrictions(
AuditStrategy auditStrategy, String versionsMiddleEntityName,
QueryBuilder remQb, MiddleComponentData... componentData) {
final Parameters disjoint = remQb.getRootParameters().addSubParameters( "or" );
// Restrictions to match all valid rows.
final Parameters valid = disjoint.addSubParameters( "and" );
// Restrictions to match all rows deleted at exactly given revision.
final Parameters removed = disjoint.addSubParameters( "and" );
createValidDataRestrictions( auditStrategy, versionsMiddleEntityName, remQb, valid, componentData );
// ee.revision = :revision
removed.addWhereWithNamedParam( verEntCfg.getRevisionNumberPath(), "=", REVISION_PARAMETER );
// ee.revision_type = DEL
removed.addWhereWithNamedParam( getRevisionTypePath(), "=", DEL_REVISION_TYPE_PARAMETER );
}
@Override
protected String getQueryString() {
return queryString;
}
@Override
protected String getQueryRemovedString() {
return queryRemovedString;
}
}