org.hibernate.loader.plan.build.internal.CascadeStyleLoadPlanBuildingAssociationVisitationStrategy Maven / Gradle / Ivy
/*
* 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,
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
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* 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.
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package org.hibernate.loader.plan.build.internal;
import org.hibernate.LockMode;
import org.hibernate.engine.FetchStrategy;
import org.hibernate.engine.FetchStyle;
import org.hibernate.engine.FetchTiming;
import org.hibernate.engine.spi.CascadingAction;
import org.hibernate.engine.spi.LoadQueryInfluencers;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
/**
* A LoadPlan building strategy for cascade processing; meaning, it builds the LoadPlan for loading related to
* cascading a particular action across associations
*
* @author Steve Ebersole
*/
public class CascadeStyleLoadPlanBuildingAssociationVisitationStrategy
extends FetchStyleLoadPlanBuildingAssociationVisitationStrategy {
private static final FetchStrategy EAGER = new FetchStrategy( FetchTiming.IMMEDIATE, FetchStyle.JOIN );
private static final FetchStrategy DELAYED = new FetchStrategy( FetchTiming.DELAYED, FetchStyle.SELECT );
private final CascadingAction cascadeActionToMatch;
/**
* Constructs a CascadeStyleLoadPlanBuildingAssociationVisitationStrategy.
*
* @param cascadeActionToMatch The particular cascading action that an attribute definition must match
* to eagerly fetch that attribute.
* @param sessionFactory The session factory
* @param loadQueryInfluencers The options which can influence the SQL query needed to perform the load.
* @param lockMode The lock mode.
*/
public CascadeStyleLoadPlanBuildingAssociationVisitationStrategy(
CascadingAction cascadeActionToMatch,
SessionFactoryImplementor sessionFactory,
LoadQueryInfluencers loadQueryInfluencers,
LockMode lockMode) {
super( sessionFactory, loadQueryInfluencers, lockMode );
this.cascadeActionToMatch = cascadeActionToMatch;
}
@Override
protected FetchStrategy determineFetchStrategy(AssociationAttributeDefinition attributeDefinition) {
return attributeDefinition.determineCascadeStyle().doCascade( cascadeActionToMatch ) ? EAGER : DELAYED;
}
}