/**
* @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());
}
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();
}
/**
* @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();
}
}
}
@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);
}