Hibernate example source code file (ToOneIdMapper.java)

This example Hibernate source code file (ToOneIdMapper.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

entityconfiguration, hashmap, idmapper, io, map, map, object, object, propertydata, serializable, serializable, setter, string, string, tooneidmapper, util

The Hibernate ToOneIdMapper.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
 *
 * 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.entities.mapper.relation;

import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.entities.EntityConfiguration;
import org.hibernate.envers.entities.PropertyData;
import org.hibernate.envers.entities.mapper.PersistentCollectionChangeData;
import org.hibernate.envers.entities.mapper.PropertyMapper;
import org.hibernate.envers.entities.mapper.id.IdMapper;
import org.hibernate.envers.entities.mapper.relation.lazy.ToOneDelegateSessionImplementor;
import org.hibernate.envers.reader.AuditReaderImplementor;
import org.hibernate.envers.tools.Tools;
import org.hibernate.envers.tools.reflection.ReflectionTools;
import org.hibernate.property.Setter;

import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author Adam Warski (adam at warski dot org)
 * @author Hern�n Chanfreau
 */
public class ToOneIdMapper implements PropertyMapper {
    private final IdMapper delegate;
    private final PropertyData propertyData;
    private final String referencedEntityName;
    private final boolean nonInsertableFake;

    public ToOneIdMapper(IdMapper delegate, PropertyData propertyData, String referencedEntityName, boolean nonInsertableFake) {
        this.delegate = delegate;
        this.propertyData = propertyData;
        this.referencedEntityName = referencedEntityName;
        this.nonInsertableFake = nonInsertableFake;
    }

    public boolean mapToMapFromEntity(SessionImplementor session, Map<String, Object> data, Object newObj, Object oldObj) {
        HashMap<String, Object> newData = new HashMap();

        // If this property is originally non-insertable, but made insertable because it is in a many-to-one "fake"
        // bi-directional relation, we always store the "old", unchaged data, to prevent storing changes made
        // to this field. It is the responsibility of the collection to properly update it if it really changed.
        delegate.mapToMapFromEntity(newData, nonInsertableFake ? oldObj : newObj);

		for (Map.Entry<String, Object> entry : newData.entrySet()) {
			data.put(entry.getKey(), entry.getValue());
		}

        //noinspection SimplifiableConditionalExpression
        return nonInsertableFake ? false : !Tools.entitiesEqual(session, referencedEntityName, newObj, oldObj);
    }

    public void mapToEntityFromMap(AuditConfiguration verCfg, Object obj, Map data, Object primaryKey,
                                   AuditReaderImplementor versionsReader, Number revision) {
        if (obj == null) {
            return;
        }

		Object entityId;
		entityId = delegate.mapToIdFromMap(data);
        Object value;
        if (entityId == null) {
            value = null;
        } else {
            if (versionsReader.getFirstLevelCache().contains(referencedEntityName, revision, entityId)) {
                value = versionsReader.getFirstLevelCache().get(referencedEntityName, revision, entityId);
            } else {
            	EntityConfiguration entCfg = verCfg.getEntCfg().get(referencedEntityName);
            	if(entCfg == null) {
            		// a relation marked as RelationTargetAuditMode.NOT_AUDITED
            		entCfg = verCfg.getEntCfg().getNotVersionEntityConfiguration(referencedEntityName);
            	}

                Class<?> entityClass = ReflectionTools.loadClass(entCfg.getEntityClassName());

                value = versionsReader.getSessionImplementor().getFactory().getEntityPersister(referencedEntityName).
                        createProxy((Serializable)entityId, new ToOneDelegateSessionImplementor(versionsReader, entityClass, entityId, revision, verCfg));
            }
        }

        Setter setter = ReflectionTools.getSetter(obj.getClass(), propertyData);
        setter.set(obj, value, null);
    }

    public List<PersistentCollectionChangeData> mapCollectionChanges(String referencingPropertyName,
                                                                     PersistentCollection newColl,
                                                                     Serializable oldColl,
                                                                     Serializable id) {
        return null;
    }
}