Hibernate example source code file (ComponentPropertyMapper.java)

This example Hibernate source code file (ComponentPropertyMapper.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

componentpropertymapper, componentpropertymapper, compositemapperbuilder, io, map, multipropertymapper, object, object, propertydata, propertymapper, propertymapper, serializable, setter, string, string, util

The Hibernate ComponentPropertyMapper.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;
import java.io.Serializable;
import java.util.List;
import java.util.Map;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.entities.PropertyData;
import org.hibernate.envers.exception.AuditException;
import org.hibernate.envers.reader.AuditReaderImplementor;
import org.hibernate.envers.tools.reflection.ReflectionTools;
import org.hibernate.property.Setter;
import org.hibernate.internal.util.ReflectHelper;

/**
 * @author Adam Warski (adam at warski dot org)
 */
public class ComponentPropertyMapper implements PropertyMapper, CompositeMapperBuilder {
    private final PropertyData propertyData;
    private final MultiPropertyMapper delegate;
	private final String componentClassName;

    public ComponentPropertyMapper(PropertyData propertyData, String componentClassName) {
        this.propertyData = propertyData;
        this.delegate = new MultiPropertyMapper();
		this.componentClassName = componentClassName;
    }

	public void add(PropertyData propertyData) {
        delegate.add(propertyData);
    }

    public CompositeMapperBuilder addComponent(PropertyData propertyData, String componentClassName) {
        return delegate.addComponent(propertyData, componentClassName);
    }

    public void addComposite(PropertyData propertyData, PropertyMapper propertyMapper) {
        delegate.addComposite(propertyData, propertyMapper);
    }

    public boolean mapToMapFromEntity(SessionImplementor session, Map<String, Object> data, Object newObj, Object oldObj) {
        return delegate.mapToMapFromEntity(session, data, newObj, oldObj);
    }

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

        Setter setter = ReflectionTools.getSetter(obj.getClass(), propertyData);

		// If all properties are null and single, then the component has to be null also.
		boolean allNullAndSingle = true;
		for (Map.Entry<PropertyData, PropertyMapper> property : delegate.getProperties().entrySet()) {
			if (data.get(property.getKey().getName()) != null || !(property.getValue() instanceof SinglePropertyMapper)) {
				allNullAndSingle = false;
				break;
			}
		}

		if (allNullAndSingle) {
			// single property, but default value need not be null, so we'll set it to null anyway 
			setter.set(obj, null, null);			
		} else {
			// set the component
			try {
				Object subObj = ReflectHelper.getDefaultConstructor(
						Thread.currentThread().getContextClassLoader().loadClass(componentClassName)).newInstance();
				setter.set(obj, subObj, null);
				delegate.mapToEntityFromMap(verCfg, subObj, data, primaryKey, versionsReader, revision);
			} catch (Exception e) {
				throw new AuditException(e);
			}
		}
    }

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

}