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Hibernate's entity version (audit/history) support
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	/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.envers.internal.entities.mapper;

import java.util.Map;

import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.envers.boot.internal.EnversService;
import org.hibernate.envers.internal.entities.PropertyData;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;

/**
 * Multi mapper for dynamic components (it knows that component is a map, not a class)
 *
 * @author Lukasz Zuchowski (author at zuchos dot com)
 * @author Chris Cranford
 */
public class MultiDynamicComponentMapper extends MultiPropertyMapper {

	private PropertyData dynamicComponentData;

	public MultiDynamicComponentMapper(PropertyData dynamicComponentData) {
		this.dynamicComponentData = dynamicComponentData;
	}

	@Override
	public void addComposite(PropertyData propertyData, PropertyMapper propertyMapper) {
		// delegate to the super implementation and then mark the property mapper as a dynamic-component map.
		super.addComposite( propertyData, propertyMapper );
		propertyMapper.markAsDynamicComponentMap();
	}

	@Override
	public void add(PropertyData propertyData) {
		final SinglePropertyMapper single = new SinglePropertyMapper();
		single.add( propertyData );

		// delegate to our implementation of #addComposite for specialized behavior.
		addComposite( propertyData, single );
	}

	@Override
	public boolean mapToMapFromEntity(
			SessionImplementor session,
			Map data,
			Object newObj,
			Object oldObj) {
		boolean ret = false;
		for ( Map.Entry entry : properties.entrySet() ) {
			final PropertyData propertyData = entry.getKey();
			final PropertyMapper propertyMapper = entry.getValue();
			if ( newObj == null && oldObj == null ) {
				return false;
			}
			Object newValue = newObj == null ? null : getValue( newObj, propertyData );
			Object oldValue = oldObj == null ? null : getValue( oldObj, propertyData );

			ret |= propertyMapper.mapToMapFromEntity( session, data, newValue, oldValue );
		}

		return ret;
	}

	private Object getValue(Object newObj, PropertyData propertyData) {
		return ( (Map) newObj ).get( propertyData.getBeanName() );
	}

	@Override
	public boolean map(
			SessionImplementor session,
			Map data,
			String[] propertyNames,
			Object[] newState,
			Object[] oldState) {
		boolean ret = false;
		for ( int i = 0; i < propertyNames.length; i++ ) {
			final String propertyName = propertyNames[i];
			Map propertyDatas = getPropertyDatas();
			if ( propertyDatas.containsKey( propertyName ) ) {
				final PropertyMapper propertyMapper = properties.get( propertyDatas.get( propertyName ) );
				final Object newObj = getAtIndexOrNull( newState, i );
				final Object oldObj = getAtIndexOrNull( oldState, i );
				ret |= propertyMapper.mapToMapFromEntity( session, data, newObj, oldObj );
				propertyMapper.mapModifiedFlagsToMapFromEntity( session, data, newObj, oldObj );
			}
		}

		return ret;
	}

	@Override
	public void mapModifiedFlagsToMapFromEntity(
			SessionImplementor session,
			Map data,
			Object newObj,
			Object oldObj) {
		for ( Map.Entry entry : properties.entrySet() ) {
			final PropertyData propertyData = entry.getKey();
			final PropertyMapper propertyMapper = entry.getValue();
			if ( newObj == null && oldObj == null ) {
				return;
			}
			Object newValue = newObj == null ? null : getValue( newObj, propertyData );
			Object oldValue = oldObj == null ? null : getValue( oldObj, propertyData );
			propertyMapper.mapModifiedFlagsToMapFromEntity( session, data, newValue, oldValue );
		}
	}

	@Override
	public void mapToEntityFromMap(
			EnversService enversService,
			Object obj,
			Map data,
			Object primaryKey,
			AuditReaderImplementor versionsReader,
			Number revision) {
		for ( PropertyMapper mapper : properties.values() ) {
			mapper.mapToEntityFromMap( enversService, obj, data, primaryKey, versionsReader, revision );
		}
	}
}