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/*
 * 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.configuration.internal.metadata.reader;

import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.JoinColumn;
import javax.persistence.MapKey;
import javax.persistence.OneToMany;
import javax.persistence.Version;

import org.hibernate.MappingException;
import org.hibernate.annotations.common.reflection.ReflectionManager;
import org.hibernate.annotations.common.reflection.XClass;
import org.hibernate.annotations.common.reflection.XProperty;
import org.hibernate.cfg.AccessType;
import org.hibernate.envers.AuditJoinTable;
import org.hibernate.envers.AuditMappedBy;
import org.hibernate.envers.AuditOverride;
import org.hibernate.envers.AuditOverrides;
import org.hibernate.envers.Audited;
import org.hibernate.envers.ModificationStore;
import org.hibernate.envers.NotAudited;
import org.hibernate.envers.RelationTargetAuditMode;
import org.hibernate.envers.configuration.internal.GlobalConfiguration;
import org.hibernate.envers.configuration.internal.metadata.MetadataTools;
import org.hibernate.envers.internal.tools.MappingTools;
import org.hibernate.envers.internal.tools.ReflectionTools;
import org.hibernate.envers.internal.tools.StringTools;
import org.hibernate.mapping.Component;
import org.hibernate.mapping.Property;
import org.hibernate.mapping.Value;

import static org.hibernate.envers.internal.tools.Tools.newHashMap;
import static org.hibernate.envers.internal.tools.Tools.newHashSet;

/**
 * Reads persistent properties form a {@link PersistentPropertiesSource} and adds the ones that are audited to a
 * {@link AuditedPropertiesHolder}, filling all the auditing data.
 *
 * @author Adam Warski (adam at warski dot org)
 * @author Erik-Berndt Scheper
 * @author Hern&aacut;n Chanfreau
 * @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
 * @author Michal Skowronek (mskowr at o2 dot pl)
 * @author Lukasz Zuchowski (author at zuchos dot com)
 */
public class AuditedPropertiesReader {
	protected final ModificationStore defaultStore;
	private final PersistentPropertiesSource persistentPropertiesSource;
	private final AuditedPropertiesHolder auditedPropertiesHolder;
	private final GlobalConfiguration globalCfg;
	private final ReflectionManager reflectionManager;
	private final String propertyNamePrefix;

	private final Set propertyAccessedPersistentProperties;
	private final Set fieldAccessedPersistentProperties;
	// Mapping class field to corresponding  element.
	private final Map propertiesGroupMapping;

	private final Set overriddenAuditedProperties;
	private final Set overriddenNotAuditedProperties;

	private final Set overriddenAuditedClasses;
	private final Set overriddenNotAuditedClasses;

	public AuditedPropertiesReader(
			ModificationStore defaultStore,
			PersistentPropertiesSource persistentPropertiesSource,
			AuditedPropertiesHolder auditedPropertiesHolder,
			GlobalConfiguration globalCfg,
			ReflectionManager reflectionManager,
			String propertyNamePrefix) {
		this.defaultStore = defaultStore;
		this.persistentPropertiesSource = persistentPropertiesSource;
		this.auditedPropertiesHolder = auditedPropertiesHolder;
		this.globalCfg = globalCfg;
		this.reflectionManager = reflectionManager;
		this.propertyNamePrefix = propertyNamePrefix;

		propertyAccessedPersistentProperties = newHashSet();
		fieldAccessedPersistentProperties = newHashSet();
		propertiesGroupMapping = newHashMap();

		overriddenAuditedProperties = newHashSet();
		overriddenNotAuditedProperties = newHashSet();

		overriddenAuditedClasses = newHashSet();
		overriddenNotAuditedClasses = newHashSet();
	}

	public void read() {
		// First reading the access types for the persistent properties.
		readPersistentPropertiesAccess();

		if ( persistentPropertiesSource instanceof DynamicComponentSource ) {
			addPropertiesFromDynamicComponent( (DynamicComponentSource) persistentPropertiesSource );
		}
		else {
			// Retrieve classes and properties that are explicitly marked for auditing process by any superclass
			// of currently mapped entity or itself.
			final XClass clazz = persistentPropertiesSource.getXClass();
			readAuditOverrides( clazz );

			// Adding all properties from the given class.
			addPropertiesFromClass( clazz );
		}
	}

	/**
	 * Recursively constructs sets of audited and not audited properties and classes which behavior has been overridden
	 * using {@link AuditOverride} annotation.
	 *
	 * @param clazz Class that is being processed. Currently mapped entity shall be passed during first invocation.
	 */
	private void readAuditOverrides(XClass clazz) {
		/* TODO: Code to remove with @Audited.auditParents - start. */
		final Audited allClassAudited = clazz.getAnnotation( Audited.class );
		if ( allClassAudited != null && allClassAudited.auditParents().length > 0 ) {
			for ( Class c : allClassAudited.auditParents() ) {
				final XClass parentClass = reflectionManager.toXClass( c );
				checkSuperclass( clazz, parentClass );
				if ( !overriddenNotAuditedClasses.contains( parentClass ) ) {
					// If the class has not been marked as not audited by the subclass.
					overriddenAuditedClasses.add( parentClass );
				}
			}
		}
		/* TODO: Code to remove with @Audited.auditParents - finish. */
		final List auditOverrides = computeAuditOverrides( clazz );
		for ( AuditOverride auditOverride : auditOverrides ) {
			if ( auditOverride.forClass() != void.class ) {
				final XClass overrideClass = reflectionManager.toXClass( auditOverride.forClass() );
				checkSuperclass( clazz, overrideClass );
				final String propertyName = auditOverride.name();
				if ( !StringTools.isEmpty( propertyName ) ) {
					// Override @Audited annotation on property level.
					final XProperty property = getProperty( overrideClass, propertyName );
					if ( auditOverride.isAudited() ) {
						if ( !overriddenNotAuditedProperties.contains( property ) ) {
							// If the property has not been marked as not audited by the subclass.
							overriddenAuditedProperties.add( property );
						}
					}
					else {
						if ( !overriddenAuditedProperties.contains( property ) ) {
							// If the property has not been marked as audited by the subclass.
							overriddenNotAuditedProperties.add( property );
						}
					}
				}
				else {
					// Override @Audited annotation on class level.
					if ( auditOverride.isAudited() ) {
						if ( !overriddenNotAuditedClasses.contains( overrideClass ) ) {
							// If the class has not been marked as not audited by the subclass.
							overriddenAuditedClasses.add( overrideClass );
						}
					}
					else {
						if ( !overriddenAuditedClasses.contains( overrideClass ) ) {
							// If the class has not been marked as audited by the subclass.
							overriddenNotAuditedClasses.add( overrideClass );
						}
					}
				}
			}
		}
		final XClass superclass = clazz.getSuperclass();
		if ( !clazz.isInterface() && !Object.class.getName().equals( superclass.getName() ) ) {
			readAuditOverrides( superclass );
		}
	}

	/**
	 * @param clazz Source class.
	 *
	 * @return List of @AuditOverride annotations applied at class level.
	 */
	private List computeAuditOverrides(XClass clazz) {
		final AuditOverrides auditOverrides = clazz.getAnnotation( AuditOverrides.class );
		final AuditOverride auditOverride = clazz.getAnnotation( AuditOverride.class );
		if ( auditOverrides == null && auditOverride != null ) {
			return Arrays.asList( auditOverride );
		}
		else if ( auditOverrides != null && auditOverride == null ) {
			return Arrays.asList( auditOverrides.value() );
		}
		else if ( auditOverrides != null && auditOverride != null ) {
			throw new MappingException(
					"@AuditOverrides annotation should encapsulate all @AuditOverride declarations. " +
							"Please revise Envers annotations applied to class " + clazz.getName() + "."
			);
		}
		return Collections.emptyList();
	}

	/**
	 * Checks whether one class is assignable from another. If not {@link MappingException} is thrown.
	 *
	 * @param child Subclass.
	 * @param parent Superclass.
	 */
	private void checkSuperclass(XClass child, XClass parent) {
		if ( !parent.isAssignableFrom( child ) ) {
			throw new MappingException(
					"Class " + parent.getName() + " is not assignable from " + child.getName() + ". " +
							"Please revise Envers annotations applied to " + child.getName() + " type."
			);
		}
	}

	/**
	 * Checks whether class contains property with a given name. If not {@link MappingException} is thrown.
	 *
	 * @param clazz Class.
	 * @param propertyName Property name.
	 *
	 * @return Property object.
	 */
	private XProperty getProperty(XClass clazz, String propertyName) {
		final XProperty property = ReflectionTools.getProperty( clazz, propertyName );
		if ( property == null ) {
			throw new MappingException(
					"Property '" + propertyName + "' not found in class " + clazz.getName() + ". " +
							"Please revise Envers annotations applied to class " + persistentPropertiesSource.getXClass() + "."
			);
		}
		return property;
	}

	private void readPersistentPropertiesAccess() {
		final Iterator propertyIter = persistentPropertiesSource.getPropertyIterator();
		while ( propertyIter.hasNext() ) {
			final Property property = propertyIter.next();
			addPersistentProperty( property );
			if ( "embedded".equals( property.getPropertyAccessorName() ) && property.getName()
					.equals( property.getNodeName() ) ) {
				// If property name equals node name and embedded accessor type is used, processing component
				// has been defined with  tag. See HHH-6636 JIRA issue.
				createPropertiesGroupMapping( property );
			}
		}
	}

	private void addPersistentProperty(Property property) {
		if ( "field".equals( property.getPropertyAccessorName() ) ) {
			fieldAccessedPersistentProperties.add( property.getName() );
		}
		else {
			propertyAccessedPersistentProperties.add( property.getName() );
		}
	}

	@SuppressWarnings("unchecked")
	private void createPropertiesGroupMapping(Property property) {
		final Component component = (Component) property.getValue();
		final Iterator componentProperties = component.getPropertyIterator();
		while ( componentProperties.hasNext() ) {
			final Property componentProperty = componentProperties.next();
			propertiesGroupMapping.put( componentProperty.getName(), component.getNodeName() );
		}
	}

	/**
	 * @param clazz Class which properties are currently being added.
	 *
	 * @return {@link Audited} annotation of specified class. If processed type hasn't been explicitly marked, method
	 *         checks whether given class exists in {@link AuditedPropertiesReader#overriddenAuditedClasses} collection.
	 *         In case of success, {@link Audited} configuration of currently mapped entity is returned, otherwise
	 *         {@code null}. If processed type exists in {@link AuditedPropertiesReader#overriddenNotAuditedClasses}
	 *         collection, the result is also {@code null}.
	 */
	private Audited computeAuditConfiguration(XClass clazz) {
		Audited allClassAudited = clazz.getAnnotation( Audited.class );
		// If processed class is not explicitly marked with @Audited annotation, check whether auditing is
		// forced by any of its child entities configuration (@AuditedOverride.forClass).
		if ( allClassAudited == null && overriddenAuditedClasses.contains( clazz ) ) {
			// Declared audited parent copies @Audited.modStore and @Audited.targetAuditMode configuration from
			// currently mapped entity.
			allClassAudited = persistentPropertiesSource.getXClass().getAnnotation( Audited.class );
			if ( allClassAudited == null ) {
				// If parent class declares @Audited on the field/property level.
				allClassAudited = DEFAULT_AUDITED;
			}
		}
		else if ( allClassAudited != null && overriddenNotAuditedClasses.contains( clazz ) ) {
			return null;
		}
		return allClassAudited;
	}

	private void addPropertiesFromDynamicComponent(DynamicComponentSource dynamicComponentSource) {
		Audited audited = computeAuditConfiguration( dynamicComponentSource.getXClass() );
		if ( !fieldAccessedPersistentProperties.isEmpty() ) {
			throw new MappingException(
					"Audited dynamic component cannot have properties with access=\"field\" for properties: " + fieldAccessedPersistentProperties + ". \n Change properties access=\"property\", to make it work)"
			);
		}
		for ( String property : propertyAccessedPersistentProperties ) {
			String accessType = AccessType.PROPERTY.getType();
			if ( !auditedPropertiesHolder.contains( property ) ) {
				final Value propertyValue = persistentPropertiesSource.getProperty( property ).getValue();
				if ( propertyValue instanceof Component ) {
					this.addFromComponentProperty(
							new DynamicProperty( dynamicComponentSource, property ),
							accessType,
							(Component) propertyValue,
							audited
					);
				}
				else {
					this.addFromNotComponentProperty(
							new DynamicProperty( dynamicComponentSource, property ),
							accessType,
							audited
					);
				}
			}
		}
	}

	/**
	 * Recursively adds all audited properties of entity class and its superclasses.
	 *
	 * @param clazz Currently processed class.
	 */
	private void addPropertiesFromClass(XClass clazz) {
		final Audited allClassAudited = computeAuditConfiguration( clazz );

		//look in the class
		addFromProperties(
				clazz.getDeclaredProperties( "field" ),
				"field",
				fieldAccessedPersistentProperties,
				allClassAudited
		);
		addFromProperties(
				clazz.getDeclaredProperties( "property" ),
				"property",
				propertyAccessedPersistentProperties,
				allClassAudited
		);

		if ( allClassAudited != null || !auditedPropertiesHolder.isEmpty() ) {
			final XClass superclazz = clazz.getSuperclass();
			if ( !clazz.isInterface() && !"java.lang.Object".equals( superclazz.getName() ) ) {
				addPropertiesFromClass( superclazz );
			}
		}
	}

	private void addFromProperties(
			Iterable properties,
			String accessType,
			Set persistentProperties,
			Audited allClassAudited) {
		for ( XProperty property : properties ) {
			// If this is not a persistent property, with the same access type as currently checked,
			// it's not audited as well.
			// If the property was already defined by the subclass, is ignored by superclasses
			if ( persistentProperties.contains( property.getName() )
					&& !auditedPropertiesHolder.contains( property.getName() ) ) {
				final Value propertyValue = persistentPropertiesSource.getProperty( property.getName() ).getValue();
				if ( propertyValue instanceof Component ) {
					this.addFromComponentProperty( property, accessType, (Component) propertyValue, allClassAudited );
				}
				else {
					this.addFromNotComponentProperty( property, accessType, allClassAudited );
				}
			}
			else if ( propertiesGroupMapping.containsKey( property.getName() ) ) {
				// Retrieve embedded component name based on class field.
				final String embeddedName = propertiesGroupMapping.get( property.getName() );
				if ( !auditedPropertiesHolder.contains( embeddedName ) ) {
					// Manage properties mapped within  tag.
					final Value propertyValue = persistentPropertiesSource.getProperty( embeddedName ).getValue();
					this.addFromPropertiesGroup(
							embeddedName,
							property,
							accessType,
							(Component) propertyValue,
							allClassAudited
					);
				}
			}
		}
	}

	private void addFromPropertiesGroup(
			String embeddedName,
			XProperty property,
			String accessType,
			Component propertyValue,
			Audited allClassAudited) {
		final ComponentAuditingData componentData = new ComponentAuditingData();
		final boolean isAudited = fillPropertyData( property, componentData, accessType, allClassAudited );
		if ( isAudited ) {
			// EntityPersister.getPropertyNames() returns name of embedded component instead of class field.
			componentData.setName( embeddedName );
			// Marking component properties as placed directly in class (not inside another component).
			componentData.setBeanName( null );

			final PersistentPropertiesSource componentPropertiesSource = new ComponentPropertiesSource(
					reflectionManager,
					propertyValue
			);
			final AuditedPropertiesReader audPropReader = new AuditedPropertiesReader(
					ModificationStore.FULL, componentPropertiesSource, componentData, globalCfg, reflectionManager,
					propertyNamePrefix + MappingTools.createComponentPrefix( embeddedName )
			);
			audPropReader.read();

			auditedPropertiesHolder.addPropertyAuditingData( embeddedName, componentData );
		}
	}

	private void addFromComponentProperty(
			XProperty property,
			String accessType,
			Component propertyValue,
			Audited allClassAudited) {
		final ComponentAuditingData componentData = new ComponentAuditingData();
		final boolean isAudited = fillPropertyData( property, componentData, accessType, allClassAudited );

		final PersistentPropertiesSource componentPropertiesSource;
		if ( propertyValue.isDynamic() ) {
			componentPropertiesSource = new DynamicComponentSource( reflectionManager, propertyValue, property );
		}
		else {
			componentPropertiesSource = new ComponentPropertiesSource( reflectionManager, propertyValue );
		}

		final ComponentAuditedPropertiesReader audPropReader = new ComponentAuditedPropertiesReader(
				ModificationStore.FULL,
				componentPropertiesSource,
				componentData,
				globalCfg,
				reflectionManager,
				propertyNamePrefix + MappingTools.createComponentPrefix( property.getName() )
		);
		audPropReader.read();

		if ( isAudited ) {
			// Now we know that the property is audited
			auditedPropertiesHolder.addPropertyAuditingData( property.getName(), componentData );
		}
	}

	private void addFromNotComponentProperty(XProperty property, String accessType, Audited allClassAudited) {
		final PropertyAuditingData propertyData = new PropertyAuditingData();
		final boolean isAudited = fillPropertyData( property, propertyData, accessType, allClassAudited );

		if ( isAudited ) {
			// Now we know that the property is audited
			auditedPropertiesHolder.addPropertyAuditingData( property.getName(), propertyData );
		}
	}


	/**
	 * Checks if a property is audited and if yes, fills all of its data.
	 *
	 * @param property Property to check.
	 * @param propertyData Property data, on which to set this property's modification store.
	 * @param accessType Access type for the property.
	 *
	 * @return False if this property is not audited.
	 */
	private boolean fillPropertyData(
			XProperty property,
			PropertyAuditingData propertyData,
			String accessType,
			Audited allClassAudited) {

		// check if a property is declared as not audited to exclude it
		// useful if a class is audited but some properties should be excluded
		final NotAudited unVer = property.getAnnotation( NotAudited.class );
		if ( ( unVer != null
				&& !overriddenAuditedProperties.contains( property ) )
				|| overriddenNotAuditedProperties.contains( property ) ) {
			return false;
		}
		else {
			// if the optimistic locking field has to be unversioned and the current property
			// is the optimistic locking field, don't audit it
			if ( globalCfg.isDoNotAuditOptimisticLockingField() ) {
				final Version jpaVer = property.getAnnotation( Version.class );
				if ( jpaVer != null ) {
					return false;
				}
			}
		}


		if ( !this.checkAudited( property, propertyData, allClassAudited ) ) {
			return false;
		}

		final String propertyName = propertyNamePrefix + property.getName();
		propertyData.setName( propertyName );
		propertyData.setModifiedFlagName(
				MetadataTools.getModifiedFlagPropertyName(
						propertyName,
						globalCfg.getModifiedFlagSuffix()
				)
		);
		propertyData.setBeanName( property.getName() );
		propertyData.setAccessType( accessType );

		addPropertyJoinTables( property, propertyData );
		addPropertyAuditingOverrides( property, propertyData );
		if ( !processPropertyAuditingOverrides( property, propertyData ) ) {
			// not audited due to AuditOverride annotation
			return false;
		}
		addPropertyMapKey( property, propertyData );
		setPropertyAuditMappedBy( property, propertyData );
		setPropertyRelationMappedBy( property, propertyData );

		return true;
	}


	protected boolean checkAudited(
			XProperty property,
			PropertyAuditingData propertyData, Audited allClassAudited) {
		// Checking if this property is explicitly audited or if all properties are.
		Audited aud = ( property.isAnnotationPresent( Audited.class ) )
				? property.getAnnotation( Audited.class )
				: allClassAudited;
		if ( aud == null
				&& overriddenAuditedProperties.contains( property )
				&& !overriddenNotAuditedProperties.contains( property ) ) {
			// Assigning @Audited defaults. If anyone needs to customize those values in the future,
			// appropriate fields shall be added to @AuditOverride annotation.
			aud = DEFAULT_AUDITED;
		}
		if ( aud != null ) {
			propertyData.setStore( aud.modStore() );
			propertyData.setRelationTargetAuditMode( aud.targetAuditMode() );
			propertyData.setUsingModifiedFlag( checkUsingModifiedFlag( aud ) );
			return true;
		}
		else {
			return false;
		}
	}

	protected boolean checkUsingModifiedFlag(Audited aud) {
		return globalCfg.hasSettingForUsingModifiedFlag() ?
				globalCfg.isGlobalWithModifiedFlag() : aud.withModifiedFlag();
	}

	private void setPropertyRelationMappedBy(XProperty property, PropertyAuditingData propertyData) {
		final OneToMany oneToMany = property.getAnnotation( OneToMany.class );
		if ( oneToMany != null && !"".equals( oneToMany.mappedBy() ) ) {
			propertyData.setRelationMappedBy( oneToMany.mappedBy() );
		}
	}

	private void setPropertyAuditMappedBy(XProperty property, PropertyAuditingData propertyData) {
		final AuditMappedBy auditMappedBy = property.getAnnotation( AuditMappedBy.class );
		if ( auditMappedBy != null ) {
			propertyData.setAuditMappedBy( auditMappedBy.mappedBy() );
			if ( !"".equals( auditMappedBy.positionMappedBy() ) ) {
				propertyData.setPositionMappedBy( auditMappedBy.positionMappedBy() );
			}
		}
	}

	private void addPropertyMapKey(XProperty property, PropertyAuditingData propertyData) {
		final MapKey mapKey = property.getAnnotation( MapKey.class );
		if ( mapKey != null ) {
			propertyData.setMapKey( mapKey.name() );
		}
	}

	private void addPropertyJoinTables(XProperty property, PropertyAuditingData propertyData) {
		// first set the join table based on the AuditJoinTable annotation
		final AuditJoinTable joinTable = property.getAnnotation( AuditJoinTable.class );
		if ( joinTable != null ) {
			propertyData.setJoinTable( joinTable );
		}
		else {
			propertyData.setJoinTable( DEFAULT_AUDIT_JOIN_TABLE );
		}
	}

	/**
	 * Add the {@link AuditOverride} annotations.
	 *
	 * @param property the property being processed
	 * @param propertyData the Envers auditing data for this property
	 */
	private void addPropertyAuditingOverrides(XProperty property, PropertyAuditingData propertyData) {
		final AuditOverride annotationOverride = property.getAnnotation( AuditOverride.class );
		if ( annotationOverride != null ) {
			propertyData.addAuditingOverride( annotationOverride );
		}
		final AuditOverrides annotationOverrides = property.getAnnotation( AuditOverrides.class );
		if ( annotationOverrides != null ) {
			propertyData.addAuditingOverrides( annotationOverrides );
		}
	}

	/**
	 * Process the {@link AuditOverride} annotations for this property.
	 *
	 * @param property the property for which the {@link AuditOverride}
	 * annotations are being processed
	 * @param propertyData the Envers auditing data for this property
	 *
	 * @return {@code false} if isAudited() of the override annotation was set to
	 */
	private boolean processPropertyAuditingOverrides(XProperty property, PropertyAuditingData propertyData) {
		// if this property is part of a component, process all override annotations
		if ( this.auditedPropertiesHolder instanceof ComponentAuditingData ) {
			final List overrides = ( (ComponentAuditingData) this.auditedPropertiesHolder ).getAuditingOverrides();
			for ( AuditOverride override : overrides ) {
				if ( property.getName().equals( override.name() ) ) {
					// the override applies to this property
					if ( !override.isAudited() ) {
						return false;
					}
					else {
						if ( override.auditJoinTable() != null ) {
							propertyData.setJoinTable( override.auditJoinTable() );
						}
					}
				}
			}

		}
		return true;
	}

	private static final Audited DEFAULT_AUDITED = new Audited() {
		@Override
		public ModificationStore modStore() {
			return ModificationStore.FULL;
		}

		@Override
		public RelationTargetAuditMode targetAuditMode() {
			return RelationTargetAuditMode.AUDITED;
		}

		@Override
		public Class[] auditParents() {
			return new Class[0];
		}

		@Override
		public boolean withModifiedFlag() {
			return false;
		}

		@Override
		public Class annotationType() {
			return this.getClass();
		}
	};

	private static final AuditJoinTable DEFAULT_AUDIT_JOIN_TABLE = new AuditJoinTable() {
		@Override
		public String name() {
			return "";
		}

		@Override
		public String schema() {
			return "";
		}

		@Override
		public String catalog() {
			return "";
		}

		@Override
		public JoinColumn[] inverseJoinColumns() {
			return new JoinColumn[0];
		}

		@Override
		public Class annotationType() {
			return this.getClass();
		}
	};

	public static class ComponentPropertiesSource implements PersistentPropertiesSource {
		private final XClass xclass;
		private final Component component;

		protected ComponentPropertiesSource(XClass xClazz, Component component) {
			this.xclass = xClazz;
			this.component = component;
		}

		public ComponentPropertiesSource(ReflectionManager reflectionManager, Component component) {
			try {
				this.xclass = reflectionManager.classForName( component.getComponentClassName(), this.getClass() );
			}
			catch ( ClassNotFoundException e ) {
				throw new MappingException( e );
			}

			this.component = component;
		}

		@Override
		@SuppressWarnings({ "unchecked" })
		public Iterator getPropertyIterator() {
			return component.getPropertyIterator();
		}

		@Override
		public Property getProperty(String propertyName) {
			return component.getProperty( propertyName );
		}

		@Override
		public XClass getXClass() {
			return xclass;
		}
	}

	public static class DynamicComponentSource extends ComponentPropertiesSource {

		private XProperty baseProperty;

		public DynamicComponentSource(ReflectionManager reflectionManager, Component component, XProperty baseProperty) {
			super( reflectionManager.toXClass( Map.class ), component );
			this.baseProperty = baseProperty;
		}
	}

}




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