/*
* 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.configuration.metadata;
import org.dom4j.Element;
import org.hibernate.MappingException;
import org.hibernate.envers.ModificationStore;
import org.hibernate.envers.RelationTargetAuditMode;
import org.hibernate.envers.configuration.metadata.reader.PropertyAuditingData;
import org.hibernate.envers.entities.EntityConfiguration;
import org.hibernate.envers.entities.IdMappingData;
import org.hibernate.envers.entities.PropertyData;
import org.hibernate.envers.entities.mapper.CompositeMapperBuilder;
import org.hibernate.envers.entities.mapper.PropertyMapper;
import org.hibernate.envers.entities.mapper.SinglePropertyMapper;
import org.hibernate.envers.entities.mapper.id.IdMapper;
import org.hibernate.envers.entities.mapper.relation.*;
import org.hibernate.envers.entities.mapper.relation.component.*;
import org.hibernate.envers.entities.mapper.relation.lazy.proxy.*;
import org.hibernate.envers.entities.mapper.relation.query.OneAuditEntityQueryGenerator;
import org.hibernate.envers.entities.mapper.relation.query.RelationQueryGenerator;
import org.hibernate.envers.internal.EnversMessageLogger;
import org.hibernate.envers.tools.MappingTools;
import org.hibernate.envers.tools.StringTools;
import org.hibernate.envers.tools.Tools;
import org.hibernate.mapping.Collection;
import org.hibernate.mapping.*;
import org.hibernate.type.*;
import org.jboss.logging.Logger;
import javax.persistence.JoinColumn;
import java.util.*;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Generates metadata for a collection-valued property.
* @author Adam Warski (adam at warski dot org)
* @author Hern�n Chanfreau
*/
public final class CollectionMetadataGenerator {
public static final EnversMessageLogger LOG = Logger.getMessageLogger(EnversMessageLogger.class, CollectionMetadataGenerator.class.getName());
private final AuditMetadataGenerator mainGenerator;
private final String propertyName;
private final Collection propertyValue;
private final CompositeMapperBuilder currentMapper;
private final String referencingEntityName;
private final EntityXmlMappingData xmlMappingData;
private final PropertyAuditingData propertyAuditingData;
private final EntityConfiguration referencingEntityConfiguration;
/**
* Null if this collection isn't a relation to another entity.
*/
private final String referencedEntityName;
/**
* @param mainGenerator Main generator, giving access to configuration and the basic mapper.
* @param propertyValue Value of the collection, as mapped by Hibernate.
* @param currentMapper Mapper, to which the appropriate {@link org.hibernate.envers.entities.mapper.PropertyMapper}
* will be added.
* @param referencingEntityName Name of the entity that owns this collection.
* @param xmlMappingData In case this collection requires a middle table, additional mapping documents will
* be created using this object.
* @param propertyAuditingData Property auditing (meta-)data. Among other things, holds the name of the
* property that references the collection in the referencing entity, the user data for middle (join)
* table and the value of the <code>@MapKey</code> annotation, if there was one.
*/
public CollectionMetadataGenerator(AuditMetadataGenerator mainGenerator,
Collection propertyValue, CompositeMapperBuilder currentMapper,
String referencingEntityName, EntityXmlMappingData xmlMappingData,
PropertyAuditingData propertyAuditingData) {
this.mainGenerator = mainGenerator;
this.propertyValue = propertyValue;
this.currentMapper = currentMapper;
this.referencingEntityName = referencingEntityName;
this.xmlMappingData = xmlMappingData;
this.propertyAuditingData = propertyAuditingData;
this.propertyName = propertyAuditingData.getName();
referencingEntityConfiguration = mainGenerator.getEntitiesConfigurations().get(referencingEntityName);
if (referencingEntityConfiguration == null) {
throw new MappingException("Unable to read auditing configuration for " + referencingEntityName + "!");
}
referencedEntityName = MappingTools.getReferencedEntityName(propertyValue.getElement());
}
void addCollection() {
Type type = propertyValue.getType();
boolean oneToManyAttachedType = type instanceof BagType || type instanceof SetType || type instanceof MapType || type instanceof ListType;
boolean inverseOneToMany = (propertyValue.getElement() instanceof OneToMany) && (propertyValue.isInverse());
boolean fakeOneToManyBidirectional = (propertyValue.getElement() instanceof OneToMany) && (propertyAuditingData.getAuditMappedBy() != null);
if (oneToManyAttachedType && (inverseOneToMany || fakeOneToManyBidirectional)) {
// A one-to-many relation mapped using @ManyToOne and @OneToMany(mappedBy="...")
addOneToManyAttached(fakeOneToManyBidirectional);
} else {
// All other kinds of relations require a middle (join) table.
addWithMiddleTable();
}
}
private MiddleIdData createMiddleIdData(IdMappingData idMappingData, String prefix, String entityName) {
return new MiddleIdData(mainGenerator.getVerEntCfg(), idMappingData, prefix, entityName,
mainGenerator.getEntitiesConfigurations().containsKey(entityName));
}
@SuppressWarnings({"unchecked"})
private void addOneToManyAttached(boolean fakeOneToManyBidirectional) {
LOG.debugf("Adding audit mapping for property %s.%s: one-to-many collection, using a join column on the referenced entity",
referencingEntityName,
propertyName);
String mappedBy = getMappedBy(propertyValue);
IdMappingData referencedIdMapping = mainGenerator.getReferencedIdMappingData(referencingEntityName,
referencedEntityName, propertyAuditingData, false);
IdMappingData referencingIdMapping = referencingEntityConfiguration.getIdMappingData();
// Generating the id mappers data for the referencing side of the relation.
MiddleIdData referencingIdData = createMiddleIdData(referencingIdMapping,
mappedBy + "_", referencingEntityName);
// And for the referenced side. The prefixed mapper won't be used (as this collection isn't persisted
// in a join table, so the prefix value is arbitrary).
MiddleIdData referencedIdData = createMiddleIdData(referencedIdMapping,
null, referencedEntityName);
// Generating the element mapping.
MiddleComponentData elementComponentData = new MiddleComponentData(
new MiddleRelatedComponentMapper(referencedIdData), 0);
// Generating the index mapping, if an index exists. It can only exists in case a javax.persistence.MapKey
// annotation is present on the entity. So the middleEntityXml will be not be used. The queryGeneratorBuilder
// will only be checked for nullnes.
MiddleComponentData indexComponentData = addIndex(null, null);
// Generating the query generator - it should read directly from the related entity.
RelationQueryGenerator queryGenerator = new OneAuditEntityQueryGenerator(mainGenerator.getGlobalCfg(),
mainGenerator.getVerEntCfg(), mainGenerator.getAuditStrategy(),
referencingIdData, referencedEntityName, referencedIdData);
// Creating common mapper data.
CommonCollectionMapperData commonCollectionMapperData = new CommonCollectionMapperData(
mainGenerator.getVerEntCfg(), referencedEntityName,
propertyAuditingData.getPropertyData(),
referencingIdData, queryGenerator);
PropertyMapper fakeBidirectionalRelationMapper;
PropertyMapper fakeBidirectionalRelationIndexMapper;
if (fakeOneToManyBidirectional) {
// In case of a fake many-to-one bidirectional relation, we have to generate a mapper which maps
// the mapped-by property name to the id of the related entity (which is the owner of the collection).
String auditMappedBy = propertyAuditingData.getAuditMappedBy();
// Creating a prefixed relation mapper.
IdMapper relMapper = referencingIdMapping.getIdMapper().prefixMappedProperties(
MappingTools.createToOneRelationPrefix(auditMappedBy));
fakeBidirectionalRelationMapper = new ToOneIdMapper(
relMapper,
// The mapper will only be used to map from entity to map, so no need to provide other details
// when constructing the PropertyData.
new PropertyData(auditMappedBy, null, null, null),
referencingEntityName, false);
// Checking if there's an index defined. If so, adding a mapper for it.
if (propertyAuditingData.getPositionMappedBy() != null) {
String positionMappedBy = propertyAuditingData.getPositionMappedBy();
fakeBidirectionalRelationIndexMapper = new SinglePropertyMapper(new PropertyData(positionMappedBy, null, null, null));
// Also, overwriting the index component data to properly read the index.
indexComponentData = new MiddleComponentData(new MiddleStraightComponentMapper(positionMappedBy), 0);
} else {
fakeBidirectionalRelationIndexMapper = null;
}
} else {
fakeBidirectionalRelationMapper = null;
fakeBidirectionalRelationIndexMapper = null;
}
// Checking the type of the collection and adding an appropriate mapper.
addMapper(commonCollectionMapperData, elementComponentData, indexComponentData);
// Storing information about this relation.
referencingEntityConfiguration.addToManyNotOwningRelation(propertyName, mappedBy,
referencedEntityName, referencingIdData.getPrefixedMapper(), fakeBidirectionalRelationMapper,
fakeBidirectionalRelationIndexMapper);
}
/**
* Adds mapping of the id of a related entity to the given xml mapping, prefixing the id with the given prefix.
* @param xmlMapping Mapping, to which to add the xml.
* @param prefix Prefix for the names of properties which will be prepended to properties that form the id.
* @param columnNameIterator Iterator over the column names that will be used for properties that form the id.
* @param relatedIdMapping Id mapping data of the related entity.
*/
@SuppressWarnings({"unchecked"})
private void addRelatedToXmlMapping(Element xmlMapping, String prefix,
MetadataTools.ColumnNameIterator columnNameIterator,
IdMappingData relatedIdMapping) {
Element properties = (Element) relatedIdMapping.getXmlRelationMapping().clone();
MetadataTools.prefixNamesInPropertyElement(properties, prefix, columnNameIterator, true, true);
for (Element idProperty : (java.util.List<Element>) properties.elements()) {
xmlMapping.add((Element) idProperty.clone());
}
}
private String getMiddleTableName(Collection value, String entityName) {
// We check how Hibernate maps the collection.
if (value.getElement() instanceof OneToMany && !value.isInverse()) {
// This must be a @JoinColumn+@OneToMany mapping. Generating the table name, as Hibernate doesn't use a
// middle table for mapping this relation.
return StringTools.getLastComponent(entityName) + "_" + StringTools.getLastComponent(MappingTools.getReferencedEntityName(value.getElement()));
}
// Hibernate uses a middle table for mapping this relation, so we get it's name directly.
return value.getCollectionTable().getName();
}
@SuppressWarnings({"unchecked"})
private void addWithMiddleTable() {
LOG.debugf("Adding audit mapping for property %s.%s: collection with a join table", referencingEntityName, propertyName);
// Generating the name of the middle table
String auditMiddleTableName;
String auditMiddleEntityName;
if (!StringTools.isEmpty(propertyAuditingData.getJoinTable().name())) {
auditMiddleTableName = propertyAuditingData.getJoinTable().name();
auditMiddleEntityName = propertyAuditingData.getJoinTable().name();
} else {
String middleTableName = getMiddleTableName(propertyValue, referencingEntityName);
auditMiddleTableName = mainGenerator.getVerEntCfg().getAuditTableName(null, middleTableName);
auditMiddleEntityName = mainGenerator.getVerEntCfg().getAuditEntityName(middleTableName);
}
LOG.debugf("Using join table name: %s", auditMiddleTableName);
// Generating the XML mapping for the middle entity, only if the relation isn't inverse.
// If the relation is inverse, will be later checked by comparing middleEntityXml with null.
Element middleEntityXml;
if (!propertyValue.isInverse()) {
// Generating a unique middle entity name
auditMiddleEntityName = mainGenerator.getAuditEntityNameRegister().createUnique(auditMiddleEntityName);
// Registering the generated name
mainGenerator.getAuditEntityNameRegister().register(auditMiddleEntityName);
middleEntityXml = createMiddleEntityXml(auditMiddleTableName, auditMiddleEntityName, propertyValue.getWhere());
} else {
middleEntityXml = null;
}
// ******
// Generating the mapping for the referencing entity (it must be an entity).
// ******
// Getting the id-mapping data of the referencing entity (the entity that "owns" this collection).
IdMappingData referencingIdMapping = referencingEntityConfiguration.getIdMappingData();
// Only valid for an inverse relation; null otherwise.
String mappedBy;
// The referencing prefix is always for a related entity. So it has always the "_" at the end added.
String referencingPrefixRelated;
String referencedPrefix;
if (propertyValue.isInverse()) {
// If the relation is inverse, then referencedEntityName is not null.
mappedBy = getMappedBy(propertyValue.getCollectionTable(), mainGenerator.getCfg().getClassMapping(referencedEntityName));
referencingPrefixRelated = mappedBy + "_";
referencedPrefix = StringTools.getLastComponent(referencedEntityName);
} else {
mappedBy = null;
referencingPrefixRelated = StringTools.getLastComponent(referencingEntityName) + "_";
referencedPrefix = referencedEntityName == null ? "element" : propertyName;
}
// Storing the id data of the referencing entity: original mapper, prefixed mapper and entity name.
MiddleIdData referencingIdData = createMiddleIdData(referencingIdMapping,
referencingPrefixRelated, referencingEntityName);
// Creating a query generator builder, to which additional id data will be added, in case this collection
// references some entities (either from the element or index). At the end, this will be used to build
// a query generator to read the raw data collection from the middle table.
QueryGeneratorBuilder queryGeneratorBuilder = new QueryGeneratorBuilder(mainGenerator.getGlobalCfg(),
mainGenerator.getVerEntCfg(), mainGenerator.getAuditStrategy(), referencingIdData,
auditMiddleEntityName);
// Adding the XML mapping for the referencing entity, if the relation isn't inverse.
if (middleEntityXml != null) {
// Adding related-entity (in this case: the referencing's entity id) id mapping to the xml.
addRelatedToXmlMapping(middleEntityXml, referencingPrefixRelated,
MetadataTools.getColumnNameIterator(propertyValue.getKey().getColumnIterator()),
referencingIdMapping);
}
// ******
// Generating the element mapping.
// ******
MiddleComponentData elementComponentData = addValueToMiddleTable(propertyValue.getElement(), middleEntityXml,
queryGeneratorBuilder, referencedPrefix, propertyAuditingData.getJoinTable().inverseJoinColumns());
// ******
// Generating the index mapping, if an index exists.
// ******
MiddleComponentData indexComponentData = addIndex(middleEntityXml, queryGeneratorBuilder);
// ******
// Generating the property mapper.
// ******
// Building the query generator.
RelationQueryGenerator queryGenerator = queryGeneratorBuilder.build(elementComponentData, indexComponentData);
// Creating common data
CommonCollectionMapperData commonCollectionMapperData = new CommonCollectionMapperData(
mainGenerator.getVerEntCfg(), auditMiddleEntityName,
propertyAuditingData.getPropertyData(),
referencingIdData, queryGenerator);
// Checking the type of the collection and adding an appropriate mapper.
addMapper(commonCollectionMapperData, elementComponentData, indexComponentData);
// ******
// Storing information about this relation.
// ******
storeMiddleEntityRelationInformation(mappedBy);
}
private MiddleComponentData addIndex(Element middleEntityXml, QueryGeneratorBuilder queryGeneratorBuilder) {
if (propertyValue instanceof IndexedCollection) {
IndexedCollection indexedValue = (IndexedCollection) propertyValue;
String mapKey = propertyAuditingData.getMapKey();
if (mapKey == null) {
// This entity doesn't specify a javax.persistence.MapKey. Mapping it to the middle entity.
return addValueToMiddleTable(indexedValue.getIndex(), middleEntityXml,
queryGeneratorBuilder, "mapkey", null);
} else {
IdMappingData referencedIdMapping = mainGenerator.getEntitiesConfigurations()
.get(referencedEntityName).getIdMappingData();
int currentIndex = queryGeneratorBuilder == null ? 0 : queryGeneratorBuilder.getCurrentIndex();
if ("".equals(mapKey)) {
// The key of the map is the id of the entity.
return new MiddleComponentData(new MiddleMapKeyIdComponentMapper(mainGenerator.getVerEntCfg(),
referencedIdMapping.getIdMapper()), currentIndex);
} else {
// The key of the map is a property of the entity.
return new MiddleComponentData(new MiddleMapKeyPropertyComponentMapper(mapKey,
propertyAuditingData.getAccessType()), currentIndex);
}
}
} else {
// No index - creating a dummy mapper.
return new MiddleComponentData(new MiddleDummyComponentMapper(), 0);
}
}
/**
*
* @param value Value, which should be mapped to the middle-table, either as a relation to another entity,
* or as a simple value.
* @param xmlMapping If not <code>null</code>, xml mapping for this value is added to this element.
* @param queryGeneratorBuilder In case <code>value</code> is a relation to another entity, information about it
* should be added to the given.
* @param prefix Prefix for proeprty names of related entities identifiers.
* @param joinColumns Names of columns to use in the xml mapping, if this array isn't null and has any elements.
* @return Data for mapping this component.
*/
@SuppressWarnings({"unchecked"})
private MiddleComponentData addValueToMiddleTable(Value value, Element xmlMapping,
QueryGeneratorBuilder queryGeneratorBuilder,
String prefix, JoinColumn[] joinColumns) {
Type type = value.getType();
if (type instanceof ManyToOneType) {
String prefixRelated = prefix + "_";
String referencedEntityName = MappingTools.getReferencedEntityName(value);
IdMappingData referencedIdMapping = mainGenerator.getReferencedIdMappingData(referencingEntityName,
referencedEntityName, propertyAuditingData, true);
// Adding related-entity (in this case: the referenced entities id) id mapping to the xml only if the
// relation isn't inverse (so when <code>xmlMapping</code> is not null).
if (xmlMapping != null) {
addRelatedToXmlMapping(xmlMapping, prefixRelated,
joinColumns != null && joinColumns.length > 0
? MetadataTools.getColumnNameIterator(joinColumns)
: MetadataTools.getColumnNameIterator(value.getColumnIterator()),
referencedIdMapping);
}
// Storing the id data of the referenced entity: original mapper, prefixed mapper and entity name.
MiddleIdData referencedIdData = createMiddleIdData(referencedIdMapping,
prefixRelated, referencedEntityName);
// And adding it to the generator builder.
queryGeneratorBuilder.addRelation(referencedIdData);
return new MiddleComponentData(new MiddleRelatedComponentMapper(referencedIdData),
queryGeneratorBuilder.getCurrentIndex());
} else {
// Last but one parameter: collection components are always insertable
boolean mapped = mainGenerator.getBasicMetadataGenerator().addBasic(xmlMapping,
new PropertyAuditingData(prefix, "field", ModificationStore.FULL, RelationTargetAuditMode.AUDITED, null, null, false),
value, null, true, true);
if (mapped) {
// Simple values are always stored in the first item of the array returned by the query generator.
return new MiddleComponentData(new MiddleSimpleComponentMapper(mainGenerator.getVerEntCfg(), prefix), 0);
} else {
mainGenerator.throwUnsupportedTypeException(type, referencingEntityName, propertyName);
// Impossible to get here.
throw new AssertionError();
}
}
}
private void addMapper(CommonCollectionMapperData commonCollectionMapperData, MiddleComponentData elementComponentData,
MiddleComponentData indexComponentData) {
Type type = propertyValue.getType();
if (type instanceof SortedSetType) {
currentMapper.addComposite(propertyAuditingData.getPropertyData(),
new SortedSetCollectionMapper(commonCollectionMapperData,
TreeSet.class, SortedSetProxy.class, elementComponentData, propertyValue.getComparator()));
} else if (type instanceof SetType) {
currentMapper.addComposite(propertyAuditingData.getPropertyData(),
new BasicCollectionMapper<Set>(commonCollectionMapperData,
HashSet.class, SetProxy.class, elementComponentData));
} else if (type instanceof SortedMapType) {
// Indexed collection, so <code>indexComponentData</code> is not null.
currentMapper.addComposite(propertyAuditingData.getPropertyData(),
new SortedMapCollectionMapper(commonCollectionMapperData,
TreeMap.class, SortedMapProxy.class, elementComponentData, indexComponentData, propertyValue.getComparator()));
} else if (type instanceof MapType) {
// Indexed collection, so <code>indexComponentData</code> is not null.
currentMapper.addComposite(propertyAuditingData.getPropertyData(),
new MapCollectionMapper<Map>(commonCollectionMapperData,
HashMap.class, MapProxy.class, elementComponentData, indexComponentData));
} else if (type instanceof BagType) {
currentMapper.addComposite(propertyAuditingData.getPropertyData(),
new BasicCollectionMapper<List>(commonCollectionMapperData,
ArrayList.class, ListProxy.class, elementComponentData));
} else if (type instanceof ListType) {
// Indexed collection, so <code>indexComponentData</code> is not null.
currentMapper.addComposite(propertyAuditingData.getPropertyData(),
new ListCollectionMapper(commonCollectionMapperData,
elementComponentData, indexComponentData));
} else {
mainGenerator.throwUnsupportedTypeException(type, referencingEntityName, propertyName);
}
}
private void storeMiddleEntityRelationInformation(String mappedBy) {
// Only if this is a relation (when there is a referenced entity).
if (referencedEntityName != null) {
if (propertyValue.isInverse()) {
referencingEntityConfiguration.addToManyMiddleNotOwningRelation(propertyName, mappedBy, referencedEntityName);
} else {
referencingEntityConfiguration.addToManyMiddleRelation(propertyName, referencedEntityName);
}
}
}
private Element createMiddleEntityXml(String auditMiddleTableName, String auditMiddleEntityName, String where) {
String schema = mainGenerator.getSchema(propertyAuditingData.getJoinTable().schema(), propertyValue.getCollectionTable());
String catalog = mainGenerator.getCatalog(propertyAuditingData.getJoinTable().catalog(), propertyValue.getCollectionTable());
Element middleEntityXml = MetadataTools.createEntity(xmlMappingData.newAdditionalMapping(),
new AuditTableData(auditMiddleEntityName, auditMiddleTableName, schema, catalog), null);
Element middleEntityXmlId = middleEntityXml.addElement("composite-id");
// If there is a where clause on the relation, adding it to the middle entity.
if (where != null) {
middleEntityXml.addAttribute("where", where);
}
middleEntityXmlId.addAttribute("name", mainGenerator.getVerEntCfg().getOriginalIdPropName());
// Adding the revision number as a foreign key to the revision info entity to the composite id of the
// middle table.
mainGenerator.addRevisionInfoRelation(middleEntityXmlId);
// Adding the revision type property to the entity xml.
mainGenerator.addRevisionType(middleEntityXml);
// All other properties should also be part of the primary key of the middle entity.
return middleEntityXmlId;
}
private String getMappedBy(Collection collectionValue) {
PersistentClass referencedClass = ((OneToMany) collectionValue.getElement()).getAssociatedClass();
// If there's an @AuditMappedBy specified, returning it directly.
String auditMappedBy = propertyAuditingData.getAuditMappedBy();
if (auditMappedBy != null) {
return auditMappedBy;
}
// searching in referenced class
String mappedBy = this.searchMappedBy(referencedClass, collectionValue);
if(mappedBy == null) {
LOG.debugf("Going to search the mapped by attribute for %s in superclasses of entity: %s",
propertyName,
referencedClass.getClassName());
PersistentClass tempClass = referencedClass;
while ((mappedBy == null) && (tempClass.getSuperclass() != null)) {
LOG.debugf("Searching in superclass: %s", tempClass.getSuperclass().getClassName());
mappedBy = this.searchMappedBy(tempClass.getSuperclass(), collectionValue);
tempClass = tempClass.getSuperclass();
}
}
if(mappedBy == null) {
throw new MappingException("Unable to read the mapped by attribute for " + propertyName + " in "
+ referencedClass.getClassName() + "!");
}
return mappedBy;
}
@SuppressWarnings({"unchecked"})
private String searchMappedBy(PersistentClass referencedClass, Collection collectionValue) {
Iterator<Property> assocClassProps = referencedClass.getPropertyIterator();
while (assocClassProps.hasNext()) {
Property property = assocClassProps.next();
if (Tools.iteratorsContentEqual(property.getValue().getColumnIterator(),
collectionValue.getKey().getColumnIterator())) {
return property.getName();
}
}
return null;
}
private String getMappedBy(Table collectionTable, PersistentClass referencedClass) {
// If there's an @AuditMappedBy specified, returning it directly.
String auditMappedBy = propertyAuditingData.getAuditMappedBy();
if (auditMappedBy != null) {
return auditMappedBy;
}
// searching in referenced class
String mappedBy = this.searchMappedBy(referencedClass, collectionTable);
// not found on referenced class, searching on superclasses
if(mappedBy == null) {
LOG.debugf("Going to search the mapped by attribute for %s in superclasses of entity: %s",
propertyName,
referencedClass.getClassName());
PersistentClass tempClass = referencedClass;
while ((mappedBy == null) && (tempClass.getSuperclass() != null)) {
LOG.debugf("Searching in superclass: %s", tempClass.getSuperclass().getClassName());
mappedBy = this.searchMappedBy(tempClass.getSuperclass(), collectionTable);
tempClass = tempClass.getSuperclass();
}
}
if(mappedBy == null) {
throw new MappingException("Unable to read the mapped by attribute for " + propertyName + " in "
+ referencedClass.getClassName() + "!");
}
return mappedBy;
}
@SuppressWarnings({"unchecked"})
private String searchMappedBy(PersistentClass referencedClass, Table collectionTable) {
Iterator<Property> properties = referencedClass.getPropertyIterator();
while (properties.hasNext()) {
Property property = properties.next();
if (property.getValue() instanceof Collection) {
// The equality is intentional. We want to find a collection property with the same collection table.
//noinspection ObjectEquality
if (((Collection) property.getValue()).getCollectionTable() == collectionTable) {
return property.getName();
}
}
}
return null;
}
}