oracle.toplink.essentials.mappings.AggregateCollectionMapping Maven / Gradle / Ivy
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package oracle.toplink.essentials.mappings;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.internal.descriptors.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.internal.identitymaps.*;
import oracle.toplink.essentials.internal.queryframework.*;
import oracle.toplink.essentials.internal.sessions.*;
import oracle.toplink.essentials.sessions.DatabaseRecord;
import oracle.toplink.essentials.descriptors.DescriptorEvent;
import oracle.toplink.essentials.descriptors.DescriptorEventManager;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.indirection.ValueHolderInterface;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
/**
* Purpose: The aggregate collection mapping is used to represent the aggregate relationship between a single
* source object and a collection of target objects. The target objects cannot exist without the existence of the
* source object (privately owned)
* Unlike the normal aggregate mapping, there is a target table being mapped from the target objects.
* Unlike normal 1:m mapping, there is no 1:1 back reference mapping, as foreign key constraints have been resolved by the aggregation.
*
* @author King (Yaoping) Wang
* @since TOPLink/Java 3.0
*/
public class AggregateCollectionMapping extends CollectionMapping implements RelationalMapping {
/** This is a key in the target table which is a foreign key in the target table. */
protected transient Vector targetForeignKeyFields;
/** This is a primary key in the source table that is used as foreign key in the target table */
protected transient Vector sourceKeyFields;
/** Foreign keys in the target table to the related keys in the source table */
protected transient Map targetForeignKeyToSourceKeys;
/**
* PUBLIC:
* Default constructor.
*/
public AggregateCollectionMapping() {
this.targetForeignKeyToSourceKeys = new HashMap(5);
this.sourceKeyFields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(1);
this.targetForeignKeyFields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(1);
this.deleteAllQuery = new DeleteAllQuery();
//aggregates should always cascade all operations
this.setCascadeAll(true);
}
/**
* INTERNAL:
*/
public boolean isRelationalMapping() {
return true;
}
/**
* PUBLIC:
* Define the target foreign key relationship in the 1-M aggregate collection mapping.
* Both the target foreign key field name and the source primary key field name must be specified.
*/
public void addTargetForeignKeyFieldName(String targetForeignKey, String sourceKey) {
getTargetForeignKeyFields().addElement(new DatabaseField(targetForeignKey));
getSourceKeyFields().addElement(new DatabaseField(sourceKey));
}
/**
* INTERNAL:
* Used during building the backup shallow copy to copy the vector without re-registering the target objects.
*/
public Object buildBackupCloneForPartObject(Object attributeValue, Object clone, Object backup, UnitOfWorkImpl unitOfWork) {
ContainerPolicy containerPolicy = getContainerPolicy();
if (attributeValue == null) {
return containerPolicy.containerInstance(1);
}
Object clonedAttributeValue = containerPolicy.containerInstance(containerPolicy.sizeFor(attributeValue));
synchronized (attributeValue) {
for (Object valuesIterator = containerPolicy.iteratorFor(attributeValue);
containerPolicy.hasNext(valuesIterator);) {
Object cloneValue = buildElementBackupClone(containerPolicy.next(valuesIterator, unitOfWork), unitOfWork);
containerPolicy.addInto(cloneValue, clonedAttributeValue, unitOfWork);
}
}
return clonedAttributeValue;
}
/**
* INTERNAL:
* Require for cloning, the part must be cloned.
* Ignore the objects, use the attribute value.
* this is identical to the super class except that the element must be added to the new
* aggregates collection so that the referenced objects will be clonned correctly
*/
public Object buildCloneForPartObject(Object attributeValue, Object original, Object clone, UnitOfWorkImpl unitOfWork, boolean isExisting) {
ContainerPolicy containerPolicy = getContainerPolicy();
if (attributeValue == null) {
return containerPolicy.containerInstance(1);
}
Object clonedAttributeValue = containerPolicy.containerInstance(containerPolicy.sizeFor(attributeValue));
// I need to synchronize here to prevent the collection from changing while I am cloning it.
// This will occur when I am merging into the cache and I am instantiating a UOW valueHolder at the same time
// I can not synchronize around the clone, as this will cause deadlocks, so I will need to copy the collection then create the clones
// I will use a temporary collection to help speed up the process
Object temporaryCollection = null;
synchronized (attributeValue) {
temporaryCollection = containerPolicy.cloneFor(attributeValue);
}
for (Object valuesIterator = containerPolicy.iteratorFor(temporaryCollection);
containerPolicy.hasNext(valuesIterator);) {
Object originalElement = containerPolicy.next(valuesIterator, unitOfWork);
//need to add to aggregate list in the case that there are related objects.
if (unitOfWork.isOriginalNewObject(original)) {
unitOfWork.addNewAggregate(originalElement);
}
Object cloneValue = buildElementClone(originalElement, unitOfWork, isExisting);
containerPolicy.addInto(cloneValue, clonedAttributeValue, unitOfWork);
}
return clonedAttributeValue;
}
/**
* INTERNAL:
* Clone the aggregate collection, if necessary.
*/
protected Object buildElementBackupClone(Object element, UnitOfWorkImpl unitOfWork) {
// Do not clone for read-only.
if (unitOfWork.isClassReadOnly(element.getClass())) {
return element;
}
ClassDescriptor aggregateDescriptor = getReferenceDescriptor(element.getClass(), unitOfWork);
Object clonedElement = aggregateDescriptor.getObjectBuilder().buildBackupClone(element, unitOfWork);
return clonedElement;
}
/**
* INTERNAL:
* Clone the aggregate collection, if necessary.
*/
protected Object buildElementClone(Object element, UnitOfWorkImpl unitOfWork, boolean isExisting) {
// Do not clone for read-only.
if (unitOfWork.isClassReadOnly(element.getClass())) {
return element;
}
ClassDescriptor aggregateDescriptor = getReferenceDescriptor(element.getClass(), unitOfWork);
// bug 2612602 as we are building the working copy make sure that we call to correct clone method.
Object clonedElement = aggregateDescriptor.getObjectBuilder().instantiateWorkingCopyClone(element, unitOfWork);
aggregateDescriptor.getObjectBuilder().populateAttributesForClone(element, clonedElement, unitOfWork, null);
// CR 4155 add the originals to the UnitOfWork so that we can find it later in the merge
// as aggregates have no identity. If we don't do this we will loose indirection information.
unitOfWork.getCloneToOriginals().put(clonedElement, element);
return clonedElement;
}
/**
* INTERNAL:
* Cascade registerNew for Create through mappings that require the cascade
*/
public void cascadeRegisterNewIfRequired(Object object, UnitOfWorkImpl uow, IdentityHashtable visitedObjects){
//aggregate objects are not registered but their mappings should be.
Object cloneAttribute = null;
cloneAttribute = getAttributeValueFromObject(object);
if ((cloneAttribute == null) || (!getIndirectionPolicy().objectIsInstantiated(cloneAttribute))) {
return;
}
ObjectBuilder builder = null;
ContainerPolicy cp = getContainerPolicy();
Object cloneObjectCollection = null;
cloneObjectCollection = getRealCollectionAttributeValueFromObject(object, uow);
Object cloneIter = cp.iteratorFor(cloneObjectCollection);
while (cp.hasNext(cloneIter)) {
Object nextObject = cp.next(cloneIter, uow);
if (nextObject != null && (! visitedObjects.contains(nextObject))){
visitedObjects.put(nextObject, nextObject);
builder = getReferenceDescriptor(nextObject.getClass(), uow).getObjectBuilder();
builder.cascadeRegisterNewForCreate(nextObject, uow, visitedObjects);
}
}
}
/**
* INTERNAL:
* Cascade registerNew for Create through mappings that require the cascade
*/
public void cascadePerformRemoveIfRequired(Object object, UnitOfWorkImpl uow, IdentityHashtable visitedObjects){
//aggregate objects are not registered but their mappings should be.
Object cloneAttribute = null;
cloneAttribute = getAttributeValueFromObject(object);
if ((cloneAttribute == null)) {
return;
}
ObjectBuilder builder = null;
ContainerPolicy cp = getContainerPolicy();
Object cloneObjectCollection = null;
cloneObjectCollection = getRealCollectionAttributeValueFromObject(object, uow);
Object cloneIter = cp.iteratorFor(cloneObjectCollection);
while (cp.hasNext(cloneIter)) {
Object nextObject = cp.next(cloneIter, uow);
if (nextObject != null && ( ! visitedObjects.contains(nextObject) ) ){
visitedObjects.put(nextObject, nextObject);
builder = getReferenceDescriptor(nextObject.getClass(), uow).getObjectBuilder();
builder.cascadePerformRemove(nextObject, uow, visitedObjects);
}
}
}
/**
* INTERNAL:
* The mapping clones itself to create deep copy.
*/
public Object clone() {
AggregateCollectionMapping mappingObject = (AggregateCollectionMapping)super.clone();
mappingObject.setTargetForeignKeyToSourceKeys(new HashMap(getTargetForeignKeyToSourceKeys()));
return mappingObject;
}
/**
* INTERNAL:
* This method is used to create a change record from comparing two aggregate collections
* @return ChangeRecord
*/
public ChangeRecord compareForChange(Object clone, Object backUp, ObjectChangeSet owner, AbstractSession session) {
Object cloneAttribute = null;
Object backUpAttribute = null;
cloneAttribute = getAttributeValueFromObject(clone);
if ((cloneAttribute != null) && (!getIndirectionPolicy().objectIsInstantiated(cloneAttribute))) {
//If the clone's valueholder was not triggered then no changes were made.
return null;
}
if (!owner.isNew()) {
backUpAttribute = getAttributeValueFromObject(backUp);
if ((backUpAttribute == null) && (cloneAttribute == null)) {
return null;
}
ContainerPolicy cp = getContainerPolicy();
Object backupCollection = null;
Object cloneCollection = null;
cloneCollection = getRealCollectionAttributeValueFromObject(clone, session);
backupCollection = getRealCollectionAttributeValueFromObject(backUp, session);
if (cp.sizeFor(backupCollection) != cp.sizeFor(cloneCollection)) {
return convertToChangeRecord(cloneCollection, owner, session);
}
Object cloneIterator = cp.iteratorFor(cloneCollection);
Object backUpIterator = cp.iteratorFor(backupCollection);
boolean change = false;
// For bug 2863721 must use a different UnitOfWorkChangeSet as here just
// seeing if changes are needed. If changes are needed then a
// real changeSet will be created later.
UnitOfWorkChangeSet uowComparisonChangeSet = new UnitOfWorkChangeSet();
while (cp.hasNext(cloneIterator)) {
Object cloneObject = cp.next(cloneIterator, session);
// For CR#2285 assume that if null is added the collection has changed.
if (cloneObject == null) {
change = true;
break;
}
Object backUpObject = null;
if (cp.hasNext(backUpIterator)) {
backUpObject = cp.next(backUpIterator, session);
} else {
change = true;
break;
}
if (cloneObject.getClass().equals(backUpObject.getClass())) {
ObjectBuilder builder = getReferenceDescriptor(cloneObject.getClass(), session).getObjectBuilder();
ObjectChangeSet initialChanges = builder.createObjectChangeSet(cloneObject, uowComparisonChangeSet, owner.isNew(), session);
//compare for changes will return null if no change is detected and I need to remove the changeSet
ObjectChangeSet changes = builder.compareForChange(cloneObject, backUpObject, uowComparisonChangeSet, session);
if (changes != null) {
change = true;
break;
}
} else {
change = true;
break;
}
}
if ((change == true) || (cp.hasNext(backUpIterator))) {
return convertToChangeRecord(cloneCollection, owner, session);
} else {
return null;
}
}
return convertToChangeRecord(getRealCollectionAttributeValueFromObject(clone, session), owner, session);
}
/**
* INTERNAL:
* Compare the attributes belonging to this mapping for the objects.
*/
public boolean compareObjects(Object firstObject, Object secondObject, AbstractSession session) {
Object firstCollection = getRealCollectionAttributeValueFromObject(firstObject, session);
Object secondCollection = getRealCollectionAttributeValueFromObject(secondObject, session);
ContainerPolicy containerPolicy = getContainerPolicy();
if (containerPolicy.sizeFor(firstCollection) != containerPolicy.sizeFor(secondCollection)) {
return false;
}
if (containerPolicy.sizeFor(firstCollection) == 0) {
return true;
}
//iterator the first aggregate collection
for (Object iterFirst = containerPolicy.iteratorFor(firstCollection);
containerPolicy.hasNext(iterFirst);) {
//fetch the next object from the first iterator.
Object firstAggregateObject = containerPolicy.next(iterFirst, session);
//iterator the second aggregate collection
for (Object iterSecond = containerPolicy.iteratorFor(secondCollection); true;) {
//fetch the next object from the second iterator.
Object secondAggregateObject = containerPolicy.next(iterSecond, session);
//matched object found, break to outer FOR loop
if (getReferenceDescriptor().getObjectBuilder().compareObjects(firstAggregateObject, secondAggregateObject, session)) {
break;
}
if (!containerPolicy.hasNext(iterSecond)) {
return false;
}
}
}
return true;
}
/**
* INTERNAL:
* This method is used to convert the contents of an aggregateCollection into a
* changeRecord
* @return oracle.toplink.essentials.internal.sessions.AggregateCollectionChangeRecord the changerecord representing this AggregateCollectionMapping
* @param owner oracle.toplink.essentials.internal.sessions.ObjectChangeSet the ChangeSet that uses this record
* @param cloneCollection Object the collection to convert
* @param session oracle.toplink.essentials.publicinterface.Session
*/
protected ChangeRecord convertToChangeRecord(Object cloneCollection, ObjectChangeSet owner, AbstractSession session) {
ContainerPolicy cp = getContainerPolicy();
Object cloneIter = cp.iteratorFor(cloneCollection);
Vector collectionChanges = new Vector(2);
while (cp.hasNext(cloneIter)) {
Object aggregateObject = cp.next(cloneIter, session);
// For CR#2258 quietly ignore nulls inserted into a collection.
if (aggregateObject != null) {
ObjectChangeSet changes = getReferenceDescriptor(aggregateObject.getClass(), session).getObjectBuilder().compareForChange(aggregateObject, null, (UnitOfWorkChangeSet)owner.getUOWChangeSet(), session);
collectionChanges.addElement(changes);
}
}
//cr 3013 Removed if collection is empty return null block, which prevents recording clear() change
AggregateCollectionChangeRecord changeRecord = new AggregateCollectionChangeRecord(owner);
changeRecord.setAttribute(getAttributeName());
changeRecord.setMapping(this);
changeRecord.setChangedValues(collectionChanges);
return changeRecord;
}
/**
* To delete all the entries matching the selection criteria from the table stored in the
* referenced descriptor
*/
protected void deleteAll(WriteObjectQuery query) throws DatabaseException {
Object referenceObjects = null;
if(usesIndirection()) {
Object attribute = getAttributeAccessor().getAttributeValueFromObject(query.getObject());
if(attribute == null || !((ValueHolderInterface)attribute).isInstantiated()) {
// An empty Vector indicates to DeleteAllQuery that no objects should be removed from cache
referenceObjects = new Vector(0);
}
}
if(referenceObjects == null) {
referenceObjects = this.getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
}
// Ensure that the query is prepare before cloning.
((DeleteAllQuery)getDeleteAllQuery()).executeDeleteAll(query.getSession().getSessionForClass(getReferenceClass()), query.getTranslationRow(), getContainerPolicy().vectorFor(referenceObjects, query.getSession()));
}
/**
* INTERNAL:
* Execute a descriptor event for the specified event code.
*/
protected void executeEvent(int eventCode, ObjectLevelModifyQuery query) {
ClassDescriptor referenceDescriptor = getReferenceDescriptor(query.getObject().getClass(), query.getSession());
// PERF: Avoid events if no listeners.
if (referenceDescriptor.getEventManager().hasAnyEventListeners()) {
referenceDescriptor.getEventManager().executeEvent(new DescriptorEvent(eventCode, query));
}
}
/**
* INTERNAL:
* Extract the source primary key value from the target row.
* Used for batch reading, most following same order and fields as in the mapping.
*/
protected Vector extractKeyFromTargetRow(AbstractRecord row, AbstractSession session) {
Vector key = new Vector(getTargetForeignKeyFields().size());
for (int index = 0; index < getTargetForeignKeyFields().size(); index++) {
DatabaseField targetField = (DatabaseField)getTargetForeignKeyFields().elementAt(index);
DatabaseField sourceField = (DatabaseField)getSourceKeyFields().elementAt(index);
Object value = row.get(targetField);
// Must ensure the classificatin to get a cache hit.
try {
value = session.getDatasourcePlatform().getConversionManager().convertObject(value, getDescriptor().getObjectBuilder().getFieldClassification(sourceField));
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(this, getDescriptor(), e);
}
key.addElement(value);
}
return key;
}
/**
* INTERNAL:
* Extract the primary key value from the source row.
* Used for batch reading, most following same order and fields as in the mapping.
*/
protected Vector extractPrimaryKeyFromRow(AbstractRecord row, AbstractSession session) {
Vector key = new Vector(getSourceKeyFields().size());
for (Enumeration fieldEnum = getSourceKeyFields().elements(); fieldEnum.hasMoreElements();) {
DatabaseField field = (DatabaseField)fieldEnum.nextElement();
Object value = row.get(field);
// Must ensure the classificatin to get a cache hit.
try {
value = session.getDatasourcePlatform().getConversionManager().convertObject(value, getDescriptor().getObjectBuilder().getFieldClassification(field));
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(this, getDescriptor(), e);
}
key.addElement(value);
}
return key;
}
/**
* INTERNAL:
* return the aggregate databaseRow with the primary keys from the source table and targer table
*/
public AbstractRecord getAggregateRow(ObjectLevelModifyQuery query, Object object) {
Vector referenceObjectKeys = getReferenceObjectKeys(query);
AbstractRecord aggregateRow = new DatabaseRecord();
Vector keys = getTargetForeignKeyFields();
for (int keyIndex = 0; keyIndex < keys.size(); keyIndex++) {
aggregateRow.put(keys.elementAt(keyIndex), referenceObjectKeys.elementAt(keyIndex));
}
getReferenceDescriptor(object.getClass(), query.getSession()).getObjectBuilder().buildRow(aggregateRow, object, query.getSession());
return aggregateRow;
}
/**
* Delete all criteria is created with target foreign keys and source keys.
* This criteria is then used to delete target records from the table.
*/
protected Expression getDeleteAllCriteria(AbstractSession session) {
Expression expression;
Expression criteria = null;
Expression builder = new ExpressionBuilder();
for (Iterator keys = getTargetForeignKeyToSourceKeys().keySet().iterator(); keys.hasNext();) {
DatabaseField targetForeignKey = (DatabaseField)keys.next();
DatabaseField sourceKey = (DatabaseField)getTargetForeignKeyToSourceKeys().get(targetForeignKey);
expression = builder.getField(targetForeignKey).equal(builder.getParameter(sourceKey));
criteria = expression.and(criteria);
}
return criteria;
}
/**
* INTERNAL:
* for inheritance purpose
*/
public ClassDescriptor getReferenceDescriptor(Class theClass, AbstractSession session) {
if (getReferenceDescriptor().getJavaClass().equals(theClass)) {
return getReferenceDescriptor();
} else {
ClassDescriptor subclassDescriptor = session.getDescriptor(theClass);
if (subclassDescriptor == null) {
throw DescriptorException.noSubClassMatch(theClass, this);
} else {
return subclassDescriptor;
}
}
}
/**
* INTERNAL:
* get reference object keys
*/
public Vector getReferenceObjectKeys(ObjectLevelModifyQuery query) throws DatabaseException, OptimisticLockException {
Vector referenceObjectKeys = new Vector(getSourceKeyFields().size());
//For CR#2587-S.M. For nested aggregate collections the source keys can easily be read from the original query.
AbstractRecord translationRow = query.getTranslationRow();
for (Enumeration sourcekeys = getSourceKeyFields().elements();
sourcekeys.hasMoreElements();) {
DatabaseField sourceKey = (DatabaseField)sourcekeys.nextElement();
// CR#2587. Try first to get the source key from the original query. If that fails try to get it from the object.
Object referenceKey = null;
if ((translationRow != null) && (translationRow.containsKey(sourceKey))) {
referenceKey = translationRow.get(sourceKey);
} else {
referenceKey = getDescriptor().getObjectBuilder().extractValueFromObjectForField(query.getObject(), sourceKey, query.getSession());
}
referenceObjectKeys.addElement(referenceKey);
}
return referenceObjectKeys;
}
/**
* PUBLIC:
* Return the source key field names associated with the mapping.
* These are in-order with the targetForeignKeyFieldNames.
*/
public Vector getSourceKeyFieldNames() {
Vector fieldNames = new Vector(getSourceKeyFields().size());
for (Enumeration fieldsEnum = getSourceKeyFields().elements();
fieldsEnum.hasMoreElements();) {
fieldNames.addElement(((DatabaseField)fieldsEnum.nextElement()).getQualifiedName());
}
return fieldNames;
}
/**
* INTERNAL:
* Return the source key names associated with the mapping
*/
public Vector getSourceKeyFields() {
return sourceKeyFields;
}
/**
* PUBLIC:
* Return the target foregin key field names associated with the mapping.
* These are in-order with the sourceKeyFieldNames.
*/
public Vector getTargetForeignKeyFieldNames() {
Vector fieldNames = new Vector(getTargetForeignKeyFields().size());
for (Enumeration fieldsEnum = getTargetForeignKeyFields().elements();
fieldsEnum.hasMoreElements();) {
fieldNames.addElement(((DatabaseField)fieldsEnum.nextElement()).getQualifiedName());
}
return fieldNames;
}
/**
* INTERNAL:
* Return the target foregin key fields associated with the mapping
*/
public Vector getTargetForeignKeyFields() {
return targetForeignKeyFields;
}
/**
* INTERNAL:
*/
public Map getTargetForeignKeyToSourceKeys() {
return targetForeignKeyToSourceKeys;
}
/**
* INTERNAL:
* For aggregate collection mapping the reference descriptor is cloned. The cloned descriptor is then
* assigned primary keys and table names before initialize. Once cloned descriptor is initialized
* it is assigned as reference descriptor in the aggregate mapping. This is a very specifiec
* behaviour for aggregate mappings. The original descriptor is used only for creating clones and
* after that mapping never uses it.
* Some initialization is done in postInitialize to ensure the target descriptor's references are initialized.
*/
public void initialize(AbstractSession session) throws DescriptorException {
super.initialize(session);
if (!getReferenceDescriptor().isAggregateCollectionDescriptor()) {
session.getIntegrityChecker().handleError(DescriptorException.referenceDescriptorIsNotAggregateCollection(getReferenceClass().getName(), this));
}
if (shouldInitializeSelectionCriteria()) {
if (isSourceKeySpecified()) {
initializeTargetForeignKeyToSourceKeys(session);
} else {
initializeTargetForeignKeyToSourceKeysWithDefaults(session);
}
initializeSelectionCriteria(session);
}
// Aggregate 1:m never maintains cache as target objects are aggregates.
getSelectionQuery().setShouldMaintainCache(false);
initializeDeleteAllQuery(session);
}
/**
* INTERNAL:
* For aggregate mapping the reference descriptor is cloned. Also the involved inheritanced descriptor, its childern
* and parents all need to be cloned. The cloned descriptors are then assigned primary keys and table names before
* initialize. Once cloned descriptor is initialized it is assigned as reference descriptor in the aggregate mapping.
* This is a very specifiec behaviour for aggregate mappings. The original descriptor is used only for creating clones
* and after that mapping never uses it.
* Some initialization is done in postInitialize to ensure the target descriptor's references are initialized.
*/
public void initializeChildInheritance(ClassDescriptor parentDescriptor, AbstractSession session) throws DescriptorException {
//recursive call to the further childern descriptors
if (parentDescriptor.getInheritancePolicy().hasChildren()) {
//setFields(clonedChildDescriptor.getFields());
Vector childDescriptors = parentDescriptor.getInheritancePolicy().getChildDescriptors();
Vector cloneChildDescriptors = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance();
for (Enumeration enumtr = childDescriptors.elements(); enumtr.hasMoreElements();) {
ClassDescriptor clonedChildDescriptor = (ClassDescriptor)((ClassDescriptor)enumtr.nextElement()).clone();
if (!clonedChildDescriptor.isAggregateCollectionDescriptor()) {
session.getIntegrityChecker().handleError(DescriptorException.referenceDescriptorIsNotAggregate(clonedChildDescriptor.getJavaClass().getName(), this));
}
clonedChildDescriptor.getInheritancePolicy().setParentDescriptor(parentDescriptor);
clonedChildDescriptor.preInitialize(session);
clonedChildDescriptor.initialize(session);
cloneChildDescriptors.addElement(clonedChildDescriptor);
initializeChildInheritance(clonedChildDescriptor, session);
}
parentDescriptor.getInheritancePolicy().setChildDescriptors(cloneChildDescriptors);
}
}
/**
* INTERNAL:
* Initialize delete all query. This query is used to delete the collection of objects from the
* target table.
*/
protected void initializeDeleteAllQuery(AbstractSession session) {
DeleteAllQuery query = (DeleteAllQuery)getDeleteAllQuery();
query.setReferenceClass(getReferenceClass());
query.setShouldMaintainCache(false);
if (!hasCustomDeleteAllQuery()) {
if (getSelectionCriteria() == null) {
query.setSelectionCriteria(getDeleteAllCriteria(session));
} else {
query.setSelectionCriteria(getSelectionCriteria());
}
}
}
/**
* INTERNAL:
* For aggregate mapping the reference descriptor is cloned. Also the involved inheritanced descriptor, its childern
* and parents all need to be cloned. The cloned descriptors are then assigned primary keys and table names before
* initialize. Once cloned descriptor is initialized it is assigned as reference descriptor in the aggregate mapping.
* This is a very specifiec behaviour for aggregate mappings. The original descriptor is used only for creating clones
* and after that mapping never uses it.
* Some initialization is done in postInitialize to ensure the target descriptor's references are initialized.
*/
public void initializeParentInheritance(ClassDescriptor parentDescriptor, ClassDescriptor childDescriptor, AbstractSession session) throws DescriptorException {
if (!parentDescriptor.isAggregateCollectionDescriptor()) {
session.getIntegrityChecker().handleError(DescriptorException.referenceDescriptorIsNotAggregateCollection(parentDescriptor.getJavaClass().getName(), this));
}
ClassDescriptor clonedParentDescriptor = (ClassDescriptor)parentDescriptor.clone();
//recursive call to the further parent descriptors
if (clonedParentDescriptor.getInheritancePolicy().isChildDescriptor()) {
ClassDescriptor parentToParentDescriptor = session.getDescriptor(clonedParentDescriptor.getJavaClass());
initializeParentInheritance(parentToParentDescriptor, parentDescriptor, session);
}
Vector childern = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(1);
childern.addElement(childDescriptor);
clonedParentDescriptor.getInheritancePolicy().setChildDescriptors(childern);
clonedParentDescriptor.preInitialize(session);
clonedParentDescriptor.initialize(session);
}
/**
* INTERNAL:
* Selection criteria is created with target foreign keys and source keys.
* This criteria is then used to read records from the target table.
*/
protected void initializeSelectionCriteria(AbstractSession session) {
Expression expression;
Expression criteria;
Expression builder = new ExpressionBuilder();
for (Iterator keys = getTargetForeignKeyToSourceKeys().keySet().iterator(); keys.hasNext();) {
DatabaseField targetForeignKey = (DatabaseField)keys.next();
DatabaseField sourceKey = (DatabaseField)getTargetForeignKeyToSourceKeys().get(targetForeignKey);
expression = builder.getField(targetForeignKey).equal(builder.getParameter(sourceKey));
criteria = expression.and(getSelectionCriteria());
setSelectionCriteria(criteria);
}
}
/**
* INTERNAL:
* The foreign keys and the primary key names are converted to DatabaseFields and stored.
*/
protected void initializeTargetForeignKeyToSourceKeys(AbstractSession session) throws DescriptorException {
if (getTargetForeignKeyFields().isEmpty()) {
throw DescriptorException.noTargetForeignKeysSpecified(this);
}
for (Enumeration keys = getTargetForeignKeyFields().elements(); keys.hasMoreElements();) {
DatabaseField foreignKeyfield = (DatabaseField)keys.nextElement();
getReferenceDescriptor().buildField(foreignKeyfield);
}
for (Enumeration keys = getSourceKeyFields().elements(); keys.hasMoreElements();) {
DatabaseField sourceKeyfield = (DatabaseField)keys.nextElement();
getDescriptor().buildField(sourceKeyfield);
}
if (getTargetForeignKeyFields().size() != getSourceKeyFields().size()) {
throw DescriptorException.targetForeignKeysSizeMismatch(this);
}
Enumeration targetForeignKeysEnum = getTargetForeignKeyFields().elements();
Enumeration sourceKeysEnum = getSourceKeyFields().elements();
for (; targetForeignKeysEnum.hasMoreElements();) {
getTargetForeignKeyToSourceKeys().put(targetForeignKeysEnum.nextElement(), sourceKeysEnum.nextElement());
}
}
/**
* INTERNAL:
* The foreign keys and the primary key names are converted to DatabaseFields and stored. The source keys
* are not specified by the user so primary keys are extracted from the reference descriptor.
*/
protected void initializeTargetForeignKeyToSourceKeysWithDefaults(AbstractSession session) throws DescriptorException {
if (getTargetForeignKeyFields().isEmpty()) {
throw DescriptorException.noTargetForeignKeysSpecified(this);
}
List sourceKeys = getDescriptor().getPrimaryKeyFields();
setSourceKeyFields(oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(sourceKeys));
for (Enumeration keys = getTargetForeignKeyFields().elements(); keys.hasMoreElements();) {
DatabaseField foreignKeyfield = ((DatabaseField)keys.nextElement());
getReferenceDescriptor().buildField(foreignKeyfield);
}
if (getTargetForeignKeyFields().size() != sourceKeys.size()) {
throw DescriptorException.targetForeignKeysSizeMismatch(this);
}
for (int index = 0; index < getTargetForeignKeyFields().size(); index++) {
getTargetForeignKeyToSourceKeys().put(getTargetForeignKeyFields().get(index), sourceKeys.get(index));
}
}
/**
* INTERNAL:
* Iterate on the specified element.
*/
public void iterateOnElement(DescriptorIterator iterator, Object element) {
// CR#... Aggregate collections must iterate as aggregates, not regular mappings.
// For some reason the element can be null, this makes absolutly no sense, but we have a test case for it...
if (element != null) {
iterator.iterateForAggregateMapping(element, this, iterator.getSession().getDescriptor(element));
}
}
/**
* INTERNAL:
*/
public boolean isAggregateCollectionMapping() {
return true;
}
/**
* INTERNAL:
*/
public boolean isPrivateOwned() {
return true;
}
/**
* Checks if source key is specified or not.
*/
protected boolean isSourceKeySpecified() {
return !(getSourceKeyFields().isEmpty());
}
/**
* INTERNAL:
* Merge changes from the source to the target object.
* Because this is a collection mapping, values are added to or removed from the
* collection based on the changeset
*/
public void mergeChangesIntoObject(Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager) {
//Check to see if the target has an instantiated collection
if (!isAttributeValueInstantiated(target)) {
//Then do nothing.
return;
}
ContainerPolicy containerPolicy = getContainerPolicy();
AbstractSession session = mergeManager.getSession();
Object valueOfTarget = null;
//At this point the source's indirection must be instantiated or the changeSet would never have
// been created
Object sourceAggregate = null;
//On a distributed cache if our changes are for the same version as the target object
//then load the changes from database.
// CR 4143
// CR 4155 Always replace the collection with the query results as we will not be able to
// find the originals for merging and indirection information may be lost.
if (mergeManager.shouldMergeChangesIntoDistributedCache()) {
ClassDescriptor descriptor = getDescriptor();
AbstractRecord parentRow = descriptor.getObjectBuilder().extractPrimaryKeyRowFromObject(target, session);
Object result = getIndirectionPolicy().valueFromQuery(getSelectionQuery(), parentRow, session);//fix for indirection
setAttributeValueInObject(target, result);
return;
}
// iterate over the changes and merge the collections
Vector aggregateObjects = ((AggregateCollectionChangeRecord)changeRecord).getChangedValues();
valueOfTarget = containerPolicy.containerInstance();
// Next iterate over the changes and add them to the container
ObjectChangeSet objectChanges = null;
for (int i = 0; i < aggregateObjects.size(); ++i) {
objectChanges = (ObjectChangeSet)aggregateObjects.elementAt(i);
Class localClassType = objectChanges.getClassType(session);
sourceAggregate = objectChanges.getUnitOfWorkClone();
// cr 4155 Load the target from the UnitOfWork. This will be the original
// aggregate object that has the original indirection in it.
Object targetAggregate = ((UnitOfWorkImpl)mergeManager.getSession()).getCloneToOriginals().get(sourceAggregate);
if (targetAggregate == null) {
targetAggregate = getReferenceDescriptor(localClassType, session).getObjectBuilder().buildNewInstance();
}
getReferenceDescriptor(localClassType, session).getObjectBuilder().mergeChangesIntoObject(targetAggregate, objectChanges, sourceAggregate, mergeManager);
containerPolicy.addInto(targetAggregate, valueOfTarget, session);
}
setRealAttributeValueInObject(target, valueOfTarget);
}
/**
* INTERNAL:
* Merge changes from the source to the target object.
*/
public void mergeIntoObject(Object target, boolean isTargetUnInitialized, Object source, MergeManager mergeManager) {
if (isTargetUnInitialized) {
// This will happen if the target object was removed from the cache before the commit was attempted
if (mergeManager.shouldMergeWorkingCopyIntoOriginal() && (!isAttributeValueInstantiated(source))) {
setAttributeValueInObject(target, getIndirectionPolicy().getOriginalIndirectionObject(getAttributeValueFromObject(source), mergeManager.getSession()));
return;
}
}
if (!shouldMergeCascadeReference(mergeManager)) {
// This is only going to happen on mergeClone, and we should not attempt to merge the reference
return;
}
if (mergeManager.shouldMergeOriginalIntoWorkingCopy()) {
if (!isAttributeValueInstantiated(target)) {
// This will occur when the clone's value has not been instantiated yet and we do not need
// the refresh that attribute
return;
}
} else if (!isAttributeValueInstantiated(source)) {
// I am merging from a clone into an original. No need to do merge if the attribute was never
// modified
return;
}
ContainerPolicy containerPolicy = getContainerPolicy();
Object valueOfSource = getRealCollectionAttributeValueFromObject(source, mergeManager.getSession());
Object valueOfTarget = containerPolicy.containerInstance(containerPolicy.sizeFor(valueOfSource));
for (Object sourceValuesIterator = containerPolicy.iteratorFor(valueOfSource);
containerPolicy.hasNext(sourceValuesIterator);) {
Object sourceValue = containerPolicy.next(sourceValuesIterator, mergeManager.getSession());
//CR#2896 - TW
Object originalValue = getReferenceDescriptor(sourceValue.getClass(), mergeManager.getSession()).getObjectBuilder().buildNewInstance();
getReferenceDescriptor(sourceValue.getClass(), mergeManager.getSession()).getObjectBuilder().mergeIntoObject(originalValue, true, sourceValue, mergeManager);
containerPolicy.addInto(originalValue, valueOfTarget, mergeManager.getSession());
}
// Must re-set variable to allow for set method to re-morph changes if the collection is not being stored directly.
setRealAttributeValueInObject(target, valueOfTarget);
}
/**
* INTERNAL:
* An object was added to the collection during an update, insert it if private.
*/
protected void objectAddedDuringUpdate(ObjectLevelModifyQuery query, Object objectAdded, ObjectChangeSet changeSet) throws DatabaseException, OptimisticLockException {
// Insert must not be done for uow or cascaded queries and we must cascade to cascade policy.
InsertObjectQuery insertQuery = getAndPrepareModifyQueryForInsert(query, objectAdded);
query.getSession().executeQuery(insertQuery, insertQuery.getTranslationRow());
}
/**
* INTERNAL:
* An object was removed to the collection during an update, delete it if private.
*/
protected void objectRemovedDuringUpdate(ObjectLevelModifyQuery query, Object objectDeleted) throws DatabaseException, OptimisticLockException {
// Delete must not be done for uow or cascaded queries and we must cascade to cascade policy.
DeleteObjectQuery deleteQuery = new DeleteObjectQuery();
prepareModifyQueryForDelete(query, deleteQuery, objectDeleted);
query.getSession().executeQuery(deleteQuery, deleteQuery.getTranslationRow());
}
/**
* INTERNAL:
* An object is still in the collection, update it as it may have changed.
*/
protected void objectUnchangedDuringUpdate(ObjectLevelModifyQuery query, Object object, Hashtable backupCloneKeyedCache, CacheKey cachedKey) throws DatabaseException, OptimisticLockException {
// Always write for updates, either private or in uow if calling this method.
UpdateObjectQuery updateQuery = new UpdateObjectQuery();
Object backupclone = backupCloneKeyedCache.get(cachedKey);
updateQuery.setBackupClone(backupclone);
prepareModifyQueryForUpdate(query, updateQuery, object);
query.getSession().executeQuery(updateQuery, updateQuery.getTranslationRow());
}
/**
* INTERNAL:
* For aggregate collection mapping the reference descriptor is cloned. The cloned descriptor is then
* assigned primary keys and table names before initialize. Once cloned descriptor is initialized
* it is assigned as reference descriptor in the aggregate mapping. This is a very specifiec
* behaviour for aggregate mappings. The original descriptor is used only for creating clones and
* after that mapping never uses it.
* Some initialization is done in postInitialize to ensure the target descriptor's references are initialized.
*/
public void postInitialize(AbstractSession session) throws DescriptorException {
super.postInitialize(session);
getReferenceDescriptor().postInitialize(session);
}
/**
* INTERNAL:
* Insert privately owned parts
*/
public void postInsert(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (isReadOnly()) {
return;
}
Object objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
// insert each object one by one
ContainerPolicy cp = getContainerPolicy();
for (Object iter = cp.iteratorFor(objects); cp.hasNext(iter);) {
Object object = cp.next(iter, query.getSession());
InsertObjectQuery insertQuery = getAndPrepareModifyQueryForInsert(query, object);
query.getSession().executeQuery(insertQuery, insertQuery.getTranslationRow());
}
}
/**
* INTERNAL:
* Update the privately owned parts
*/
public void postUpdate(WriteObjectQuery writeQuery) throws DatabaseException, OptimisticLockException {
if (isReadOnly()) {
return;
}
// If objects are not instantiated that means they are not changed.
if (!isAttributeValueInstantiated(writeQuery.getObject())) {
return;
}
// Manage objects added and removed from the collection.
Object objects = getRealCollectionAttributeValueFromObject(writeQuery.getObject(), writeQuery.getSession());
Object currentObjectsInDB = readPrivateOwnedForObject(writeQuery);
if (currentObjectsInDB == null) {
currentObjectsInDB = getContainerPolicy().containerInstance(1);
}
compareObjectsAndWrite(currentObjectsInDB, objects, writeQuery);
}
/**
* INTERNAL:
* Delete privately owned parts
*/
public void preDelete(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (isReadOnly()) {
return;
}
// if privately owned parts have their privately own parts, delete those one by one
// else delete everything in one shot.
if (getReferenceDescriptor().hasDependencyOnParts() || getReferenceDescriptor().usesOptimisticLocking() || (getReferenceDescriptor().hasInheritance() && getReferenceDescriptor().getInheritancePolicy().shouldReadSubclasses()) || getReferenceDescriptor().hasMultipleTables()) {
Object objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
ContainerPolicy containerPolicy = getContainerPolicy();
for (Object iter = containerPolicy.iteratorFor(objects); containerPolicy.hasNext(iter);) {
Object object = containerPolicy.next(iter, query.getSession());
DeleteObjectQuery deleteQuery = new DeleteObjectQuery();
prepareModifyQueryForDelete(query, deleteQuery, object);
query.getSession().executeQuery(deleteQuery, deleteQuery.getTranslationRow());
}
if (!query.getSession().isUnitOfWork()) {
// This deletes any objects on the database, as the collection in memory may has been changed.
// This is not required for unit of work, as the update would have already deleted these objects,
// and the backup copy will include the same objects causing double deletes.
verifyDeleteForUpdate(query);
}
} else {
deleteAll(query);
}
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
public void preInsert(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (isReadOnly()) {
return;
}
Object objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
// pre-insert each object one by one
ContainerPolicy cp = getContainerPolicy();
for (Object iter = cp.iteratorFor(objects); cp.hasNext(iter);) {
Object object = cp.next(iter, query.getSession());
InsertObjectQuery insertQuery = getAndPrepareModifyQueryForInsert(query, object);
// aggregates do not actually use a query to write to the database so the pre-write must be called here
executeEvent(DescriptorEventManager.PreWriteEvent, insertQuery);
executeEvent(DescriptorEventManager.PreInsertEvent, insertQuery);
getReferenceDescriptor().getQueryManager().preInsert(insertQuery);
}
}
/**
* INTERNAL:
* Returns clone of InsertObjectQuery from the reference descriptor, if it is not set - create it.
*/
protected InsertObjectQuery getInsertObjectQuery(AbstractSession session, ClassDescriptor desc) {
InsertObjectQuery insertQuery = desc.getQueryManager().getInsertQuery();
if (insertQuery == null) {
insertQuery = new InsertObjectQuery();
desc.getQueryManager().setInsertQuery(insertQuery);
}
if (insertQuery.getModifyRow() == null) {
AbstractRecord modifyRow = new DatabaseRecord();
for (int i = 0; i < getTargetForeignKeyFields().size(); i++) {
DatabaseField field = (DatabaseField)getTargetForeignKeyFields().elementAt(i);
modifyRow.put(field, null);
}
desc.getObjectBuilder().buildTemplateInsertRow(session, modifyRow);
insertQuery.setModifyRow(modifyRow);
}
return insertQuery;
}
/**
* INTERNAL:
* setup the modifyQuery for post insert/update and pre delete
*/
public InsertObjectQuery getAndPrepareModifyQueryForInsert(ObjectLevelModifyQuery originalQuery, Object object) {
AbstractSession session = originalQuery.getSession();
ClassDescriptor objReferenceDescriptor = getReferenceDescriptor(object.getClass(), session);
InsertObjectQuery insertQueryFromDescriptor = getInsertObjectQuery(session, objReferenceDescriptor);
insertQueryFromDescriptor.checkPrepare(session, insertQueryFromDescriptor.getModifyRow());
InsertObjectQuery insertQuery = (InsertObjectQuery)insertQueryFromDescriptor.clone();
insertQuery.setObject(object);
AbstractRecord targetForeignKeyRow = new DatabaseRecord();
Vector referenceObjectKeys = getReferenceObjectKeys(originalQuery);
for (int keyIndex = 0; keyIndex < getTargetForeignKeyFields().size(); keyIndex++) {
targetForeignKeyRow.put(getTargetForeignKeyFields().elementAt(keyIndex), referenceObjectKeys.elementAt(keyIndex));
}
insertQuery.setModifyRow(targetForeignKeyRow);
insertQuery.setTranslationRow(targetForeignKeyRow);
insertQuery.setSession(session);
insertQuery.setCascadePolicy(originalQuery.getCascadePolicy());
insertQuery.dontMaintainCache();
// For bug 2863721 must set a backup clone for compatibility with
// old event mechanism, even though for AggregateCollections there is no
// way to get a backup directly from a clone.
if (session.isUnitOfWork()) {
Object backupAttributeValue = getReferenceDescriptor(object.getClass(), session).getObjectBuilder().buildNewInstance();
insertQuery.setBackupClone(backupAttributeValue);
}
return insertQuery;
}
/**
* INTERNAL:
* setup the modifyQuery for pre delete
*/
public void prepareModifyQueryForDelete(ObjectLevelModifyQuery originalQuery, ObjectLevelModifyQuery modifyQuery, Object object) {
AbstractRecord aggregateRow = getAggregateRow(originalQuery, object);
modifyQuery.setObject(object);
modifyQuery.setPrimaryKey(getReferenceDescriptor().getObjectBuilder().extractPrimaryKeyFromRow(aggregateRow, originalQuery.getSession()));
modifyQuery.setModifyRow(aggregateRow);
modifyQuery.setTranslationRow(aggregateRow);
modifyQuery.setSession(originalQuery.getSession());
if (originalQuery.shouldCascadeOnlyDependentParts()) {
//This query is the result of being in a UnitOfWork therefor use the Aggregate Collection
//specific cascade policy to prevent cascading the delete now
modifyQuery.setCascadePolicy(DatabaseQuery.CascadeAggregateDelete);
} else {
modifyQuery.setCascadePolicy(originalQuery.getCascadePolicy());
}
modifyQuery.dontMaintainCache();
}
/**
* INTERNAL:
* setup the modifyQuery for update,
*/
public void prepareModifyQueryForUpdate(ObjectLevelModifyQuery originalQuery, ObjectLevelModifyQuery modifyQuery, Object object) {
AbstractRecord aggregateRow = getAggregateRow(originalQuery, object);
modifyQuery.setObject(object);
modifyQuery.setPrimaryKey(getReferenceDescriptor().getObjectBuilder().extractPrimaryKeyFromRow(aggregateRow, originalQuery.getSession()));
modifyQuery.setTranslationRow(aggregateRow);
modifyQuery.setSession(originalQuery.getSession());
modifyQuery.setCascadePolicy(originalQuery.getCascadePolicy());
modifyQuery.dontMaintainCache();
}
/**
* PUBLIC:
* Set the source key field names associated with the mapping.
* These must be in-order with the targetForeignKeyFieldNames.
*/
public void setSourceKeyFieldNames(Vector fieldNames) {
Vector fields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldNames.size());
for (Enumeration fieldNamesEnum = fieldNames.elements(); fieldNamesEnum.hasMoreElements();) {
fields.addElement(new DatabaseField((String)fieldNamesEnum.nextElement()));
}
setSourceKeyFields(fields);
}
/**
* INTERNAL:
* set all the primary key names associated with this mapping
*/
public void setSourceKeyFields(Vector sourceKeyFields) {
this.sourceKeyFields = sourceKeyFields;
}
/**
* PUBLIC:
* Set the target foregin key field names associated with the mapping.
* These must be in-order with the sourceKeyFieldNames.
*/
public void setTargetForeignKeyFieldNames(Vector fieldNames) {
Vector fields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldNames.size());
for (Enumeration fieldNamesEnum = fieldNames.elements(); fieldNamesEnum.hasMoreElements();) {
fields.addElement(new DatabaseField((String)fieldNamesEnum.nextElement()));
}
setTargetForeignKeyFields(fields);
}
/**
* INTERNAL:
* set the target foregin key fields associated with the mapping
*/
public void setTargetForeignKeyFields(Vector targetForeignKeyFields) {
this.targetForeignKeyFields = targetForeignKeyFields;
}
protected void setTargetForeignKeyToSourceKeys(Map targetForeignKeyToSourceKeys) {
this.targetForeignKeyToSourceKeys = targetForeignKeyToSourceKeys;
}
/**
* Returns true as any process leading to object modification should also affect its privately owned parts
* Usually used by write, insert, update and delete.
*/
protected boolean shouldObjectModifyCascadeToParts(ObjectLevelModifyQuery query) {
if (isReadOnly()) {
return false;
}
return true;
}
/**
* ADVANCED:
* This method is used to have an object add to a collection once the changeSet is applied
* The referenceKey parameter should only be used for direct Maps. PLEASE ENSURE that the changes
* have been made in the object model first.
*/
public void simpleAddToCollectionChangeRecord(Object referenceKey, Object changeSetToAdd, ObjectChangeSet changeSet, AbstractSession session) {
AggregateCollectionChangeRecord collectionChangeRecord = (AggregateCollectionChangeRecord)changeSet.getChangesForAttributeNamed(this.getAttributeName());
if (collectionChangeRecord == null) {
//if there is no change for this attribute then create a changeSet for it. no need to modify the resulting
// change record as it should be built from the clone which has the changes allready
Object cloneObject = ((UnitOfWorkChangeSet)changeSet.getUOWChangeSet()).getUOWCloneForObjectChangeSet(changeSet);
Object cloneCollection = this.getRealAttributeValueFromObject(cloneObject, session);
collectionChangeRecord = (AggregateCollectionChangeRecord)convertToChangeRecord(cloneCollection, changeSet, session);
changeSet.addChange(collectionChangeRecord);
} else {
collectionChangeRecord.getChangedValues().add(changeSetToAdd);
}
}
/**
* ADVANCED:
* This method is used to have an object removed from a collection once the changeSet is applied
* The referenceKey parameter should only be used for direct Maps. PLEASE ENSURE that the changes
* have been made in the object model first.
*/
public void simpleRemoveFromCollectionChangeRecord(Object referenceKey, Object changeSetToRemove, ObjectChangeSet changeSet, AbstractSession session) {
AggregateCollectionChangeRecord collectionChangeRecord = (AggregateCollectionChangeRecord)changeSet.getChangesForAttributeNamed(this.getAttributeName());
if (collectionChangeRecord == null) {
//if there is no change for this attribute then create a changeSet for it. no need to modify the resulting
// change record as it should be built from the clone which has the changes allready
Object cloneObject = ((UnitOfWorkChangeSet)changeSet.getUOWChangeSet()).getUOWCloneForObjectChangeSet(changeSet);
Object cloneCollection = this.getRealAttributeValueFromObject(cloneObject, session);
collectionChangeRecord = (AggregateCollectionChangeRecord)convertToChangeRecord(cloneCollection, changeSet, session);
changeSet.addChange(collectionChangeRecord);
} else {
collectionChangeRecord.getChangedValues().remove(changeSetToRemove);
}
}
/**
* INTERNAL:
* Retrieves a value from the row for a particular query key
*/
protected Object valueFromRowInternal(AbstractRecord row, JoinedAttributeManager joinManager, AbstractSession executionSession) throws DatabaseException {
// For CR#2587: a fix to allow the reading of nested aggregate collections that
// use foreign keys as primary keys.
// Even though foreign keys are not read in a read query insert them into the row that
// is returned from the database to allow cascading of primary keys.
// This row will eventually become the translation row which is used to read the aggregate collection.
// The fix works by passing foreign key information between source and target queries via the translation row.
// Must clone the row first, for due to prior optimizations the vector of fields is now part of
// a prepared query!
row = (AbstractRecord)row.clone();
int i = 0;
for (Enumeration sourceKeys = getSourceKeyFields().elements();
sourceKeys.hasMoreElements(); i++) {
DatabaseField sourceKey = (DatabaseField)sourceKeys.nextElement();
Object value = null;
// First insure that the source foreign key field is in the row.
// N.B. If get() is used and returns null it may just mean that the field exists but the value is null.
int index = row.getFields().indexOf(sourceKey);
if (index == -1) {
//Line x: Retrieve the value from the source query's translation row.
value = joinManager.getBaseQuery().getTranslationRow().get(sourceKey);
row.add(sourceKey, value);
} else {
value = row.getValues().elementAt(index);
}
//Now duplicate the source key field values with target key fields, so children aggregate collections can later access them.
//This will enable the later execution of the above line x.
row.add((DatabaseField)getTargetForeignKeyFields().elementAt(i), value);
}
return super.valueFromRowInternal(row, joinManager, executionSession);
}
/**
* INTERNAL:
* Checks if object is deleted from the database or not.
*/
public boolean verifyDelete(Object object, AbstractSession session) throws DatabaseException {
// Row is built for translation
if (isReadOnly()) {
return true;
}
AbstractRecord row = getDescriptor().getObjectBuilder().buildRowForTranslation(object, session);
Object value = session.executeQuery(getSelectionQuery(), row);
return getContainerPolicy().isEmpty(value);
}
/**
* Verifying deletes make sure that all the records privately owned by this mapping are
* actually removed. If such records are found than those are all read and removed one
* by one taking their privately owned parts into account.
*/
protected void verifyDeleteForUpdate(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
Object objects = readPrivateOwnedForObject(query);
// Delete all these object one by one.
ContainerPolicy cp = getContainerPolicy();
for (Object iter = cp.iteratorFor(objects); cp.hasNext(iter);) {
query.getSession().deleteObject(cp.next(iter, query.getSession()));
}
}
/**
* INTERNAL:
* Add a new value and its change set to the collection change record. This is used by
* attribute change tracking. Currently it is not supported in AggregateCollectionMapping.
*/
public void addToCollectionChangeRecord(Object newKey, Object newValue, ObjectChangeSet objectChangeSet, UnitOfWorkImpl uow) throws DescriptorException {
throw DescriptorException.invalidMappingOperation(this, "addToCollectionChangeRecord");
}
/**
* INTERNAL
* Return true if this mapping supports cascaded version optimistic locking.
*/
public boolean isCascadedLockingSupported() {
return true;
}
/**
* INTERNAL:
* Return if this mapping supports change tracking.
*/
public boolean isChangeTrackingSupported() {
return false;
}
/**
* INTERNAL:
* Remove a value and its change set from the collection change record. This is used by
* attribute change tracking. Currently it is not supported in AggregateCollectionMapping.
*/
public void removeFromCollectionChangeRecord(Object newKey, Object newValue, ObjectChangeSet objectChangeSet, UnitOfWorkImpl uow) throws DescriptorException {
throw DescriptorException.invalidMappingOperation(this, "removeFromCollectionChangeRecord");
}
}