Hibernate example source code file (SinglePropertyMapper.java)

This example Hibernate source code file (SinglePropertyMapper.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

hibernateexception, io, map, map, no, object, object, propertydata, propertymapper, serializable, serializable, setter, simplemapperbuilder, singlepropertymapper, singlepropertymapper, util

The Hibernate SinglePropertyMapper.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.HibernateException;
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.Tools;
import org.hibernate.envers.tools.reflection.ReflectionTools;
import org.hibernate.property.DirectPropertyAccessor;
import org.hibernate.property.Setter;

/**
 * TODO: diff
 * @author Adam Warski (adam at warski dot org)
 */
public class SinglePropertyMapper implements PropertyMapper, SimpleMapperBuilder {
    private PropertyData propertyData;

    public SinglePropertyMapper(PropertyData propertyData) {
        this.propertyData = propertyData;
    }

    public SinglePropertyMapper() { }

    public void add(PropertyData propertyData) {
        if (this.propertyData != null) {
            throw new AuditException("Only one property can be added!");
        }

        this.propertyData = propertyData;
    }

    public boolean mapToMapFromEntity(SessionImplementor session, Map<String, Object> data, Object newObj, Object oldObj) {
        data.put(propertyData.getName(), newObj);

        return !Tools.objectsEqual(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);
		Object value = data.get(propertyData.getName());
		// We only set a null value if the field is not primite. Otherwise, we leave it intact.
		if (value != null || !isPrimitive(setter, propertyData, obj.getClass())) {
        	setter.set(obj, value, null);
		}
    }

	private boolean isPrimitive(Setter setter, PropertyData propertyData, Class<?> cls) {
		if (cls == null) {
			throw new HibernateException("No field found for property: " + propertyData.getName());
		}

		if (setter instanceof DirectPropertyAccessor.DirectSetter) {
			// In a direct setter, getMethod() returns null
			// Trying to look up the field
			try {
				return cls.getDeclaredField(propertyData.getBeanName()).getType().isPrimitive();
			} catch (NoSuchFieldException e) {
				return isPrimitive(setter, propertyData, cls.getSuperclass());
			}
		} else {
			return setter.getMethod().getParameterTypes()[0].isPrimitive();
		}
	}

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

}