org.hibernate.envers.internal.entities.mapper.id.SingleIdMapper 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,
 * 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.id;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.hibernate.envers.exception.AuditException;
import org.hibernate.envers.internal.entities.PropertyData;
import org.hibernate.envers.internal.tools.ReflectionTools;
import org.hibernate.property.Getter;
import org.hibernate.property.Setter;
import org.hibernate.proxy.HibernateProxy;

/**
 * @author Adam Warski (adam at warski dot org)
 */
public class SingleIdMapper extends AbstractIdMapper implements SimpleIdMapperBuilder {
	private PropertyData propertyData;

	public SingleIdMapper() {
	}

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

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

		this.propertyData = propertyData;
	}

	@Override
	public boolean mapToEntityFromMap(Object obj, Map data) {
		if ( data == null || obj == null ) {
			return false;
		}

		final Object value = data.get( propertyData.getName() );
		if ( value == null ) {
			return false;
		}

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

		return true;
	}

	@Override
	public Object mapToIdFromMap(Map data) {
		if ( data == null ) {
			return null;
		}

		return data.get( propertyData.getName() );
	}

	@Override
	public Object mapToIdFromEntity(Object data) {
		if ( data == null ) {
			return null;
		}

		if ( data instanceof HibernateProxy ) {
			final HibernateProxy hibernateProxy = (HibernateProxy) data;
			return hibernateProxy.getHibernateLazyInitializer().getIdentifier();
		}
		else {
			final Getter getter = ReflectionTools.getGetter( data.getClass(), propertyData );
			return getter.get( data );
		}
	}

	@Override
	public void mapToMapFromId(Map data, Object obj) {
		if ( data != null ) {
			data.put( propertyData.getName(), obj );
		}
	}

	@Override
	public void mapToMapFromEntity(Map data, Object obj) {
		if ( obj == null ) {
			data.put( propertyData.getName(), null );
		}
		else {
			if ( obj instanceof HibernateProxy ) {
				final HibernateProxy hibernateProxy = (HibernateProxy) obj;
				data.put( propertyData.getName(), hibernateProxy.getHibernateLazyInitializer().getIdentifier() );
			}
			else {
				final Getter getter = ReflectionTools.getGetter( obj.getClass(), propertyData );
				data.put( propertyData.getName(), getter.get( obj ) );
			}
		}
	}

	public void mapToEntityFromEntity(Object objTo, Object objFrom) {
		if ( objTo == null || objFrom == null ) {
			return;
		}

		final Getter getter = ReflectionTools.getGetter( objFrom.getClass(), propertyData );
		final Setter setter = ReflectionTools.getSetter( objTo.getClass(), propertyData );
		setter.set( objTo, getter.get( objFrom ), null );
	}

	@Override
	public IdMapper prefixMappedProperties(String prefix) {
		return new SingleIdMapper( new PropertyData( prefix + propertyData.getName(), propertyData ) );
	}

	@Override
	public List mapToQueryParametersFromId(Object obj) {
		final List ret = new ArrayList();

		ret.add( new QueryParameterData( propertyData.getName(), obj ) );

		return ret;
	}
}