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/*
* Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1998, 2018 IBM Corporation. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// // 30/05/2012-2.4 Guy Pelletier
// - 354678: Temp classloader is still being used during metadata processing
// 09 Jan 2013-2.5 Gordon Yorke
// - 397772: JPA 2.1 Entity Graph Support
// 08/07/2016-2.7 Dalia Abo Sheasha
// - 499335: Multiple embeddable fields can't reference same object
// 03/19/2018-2.7.2 Lukas Jungmann
// - 413120: Nested Embeddable Null pointer
package org.eclipse.persistence.mappings;
import java.util.*;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import org.eclipse.persistence.internal.descriptors.changetracking.AggregateAttributeChangeListener;
import org.eclipse.persistence.internal.descriptors.changetracking.AttributeChangeListener;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.descriptors.DescriptorEventManager;
import org.eclipse.persistence.descriptors.DescriptorQueryManager;
import org.eclipse.persistence.descriptors.changetracking.ChangeTracker;
import org.eclipse.persistence.exceptions.*;
import org.eclipse.persistence.expressions.*;
import org.eclipse.persistence.internal.descriptors.*;
import org.eclipse.persistence.internal.helper.IdentityHashSet;
import org.eclipse.persistence.internal.identitymaps.CacheKey;
import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.internal.security.PrivilegedClassForName;
import org.eclipse.persistence.internal.sessions.*;
import org.eclipse.persistence.internal.sessions.remote.ObjectDescriptor;
import org.eclipse.persistence.queries.*;
import org.eclipse.persistence.sessions.remote.*;
import org.eclipse.persistence.sessions.CopyGroup;
import org.eclipse.persistence.internal.queries.AttributeItem;
import org.eclipse.persistence.internal.queries.JoinedAttributeManager;
/**
* Purpose: Two objects can be considered to be related by aggregation if there is a strict
* 1:1 relationship between the objects. This means that if the source (parent)object exists, then
* the target (child or owned) object must exist. This class implements the behavior common to the
* aggregate object and structure mappings.
*
* @author Sati
* @since TopLink for Java 1.0
*/
public abstract class AggregateMapping extends DatabaseMapping {
/** Stores a reference class */
protected Class referenceClass;
protected String referenceClassName;
/** The descriptor of the reference class */
protected ClassDescriptor referenceDescriptor;
/**
* Indicates whether the mapping (or at least one of its nested mappings, at any nested depth)
* references an entity.
* To return true the mapping (or nested mapping) should be ForeignReferenceMapping with non-null and non-aggregate reference descriptor.
* Lazily initialized.
*/
protected Boolean hasNestedIdentityReference;
/**
* Default constructor.
*/
protected AggregateMapping() {
super();
this.setWeight(WEIGHT_AGGREGATE);
}
/**
* Make a copy of the sourceQuery for the attribute.
*/
protected DeleteObjectQuery buildAggregateDeleteQuery(DeleteObjectQuery sourceQuery, Object sourceAttributeValue) {
DeleteObjectQuery aggregateQuery = new DeleteObjectQuery();
buildAggregateModifyQuery(sourceQuery, aggregateQuery, sourceAttributeValue);
return aggregateQuery;
}
/**
* Initialize the aggregate query with the settings from the source query.
*/
protected void buildAggregateModifyQuery(ObjectLevelModifyQuery sourceQuery, ObjectLevelModifyQuery aggregateQuery, Object sourceAttributeValue) {
// If we are map key mapping we can't build a backupAttributeValue
// from a back up clone since a map key mapping does not map a field
// on the source queries backup clone.
if (sourceQuery.getSession().isUnitOfWork() && ! isMapKeyMapping()) {
Object backupAttributeValue = getAttributeValueFromBackupClone(sourceQuery.getBackupClone());
if (backupAttributeValue == null) {
backupAttributeValue = getObjectBuilder(sourceAttributeValue, sourceQuery.getSession()).buildNewInstance();
}
aggregateQuery.setBackupClone(backupAttributeValue);
}
aggregateQuery.setCascadePolicy(sourceQuery.getCascadePolicy());
aggregateQuery.setObject(sourceAttributeValue);
aggregateQuery.setTranslationRow(sourceQuery.getTranslationRow());
aggregateQuery.setSession(sourceQuery.getSession());
aggregateQuery.setProperties(sourceQuery.getProperties());
}
/**
* Make a copy of the sourceQuery for the attribute.
*/
protected WriteObjectQuery buildAggregateWriteQuery(WriteObjectQuery sourceQuery, Object sourceAttributeValue) {
WriteObjectQuery aggregateQuery = new WriteObjectQuery();
buildAggregateModifyQuery(sourceQuery, aggregateQuery, sourceAttributeValue);
return aggregateQuery;
}
/**
* INTERNAL:
* Clone the attribute from the clone and assign it to the backup.
*/
@Override
public void buildBackupClone(Object clone, Object backup, UnitOfWorkImpl unitOfWork) {
Object attributeValue = getAttributeValueFromObject(clone);
setAttributeValueInObject(backup, buildBackupClonePart(attributeValue, unitOfWork));
}
/**
* INTERNAL:
* Build and return a backup clone of the attribute.
*/
protected Object buildBackupClonePart(Object attributeValue, UnitOfWorkImpl unitOfWork) {
if (attributeValue == null) {
return null;
}
return getObjectBuilder(attributeValue, unitOfWork).buildBackupClone(attributeValue, unitOfWork);
}
/**
* INTERNAL:
* Clone the attribute from the original and assign it to the clone.
*/
@Override
public void buildClone(Object original, CacheKey cacheKey, Object clone, Integer refreshCascade, AbstractSession cloningSession) {
Object attributeValue = getAttributeValueFromObject(original);
setAttributeValueInObject(clone, buildClonePart(original, clone, cacheKey, attributeValue, refreshCascade, cloningSession));
}
/**
* INTERNAL:
* A combination of readFromRowIntoObject and buildClone.
*
* buildClone assumes the attribute value exists on the original and can
* simply be copied.
*
* readFromRowIntoObject assumes that one is building an original.
*
* Both of the above assumptions are false in this method, and actually
* attempts to do both at the same time.
*
* Extract value from the row and set the attribute to this value in the
* working copy clone.
* In order to bypass the shared cache when in transaction a UnitOfWork must
* be able to populate working copies directly from the row.
*/
@Override
public void buildCloneFromRow(AbstractRecord databaseRow, JoinedAttributeManager joinManager, Object clone, CacheKey sharedCacheKey, ObjectBuildingQuery sourceQuery, UnitOfWorkImpl unitOfWork, AbstractSession executionSession) {
// automatically returns a uow result from scratch that doesn't need cloning
Object cloneAttributeValue = valueFromRow(databaseRow, joinManager, sourceQuery, sharedCacheKey, executionSession, true, null);
setAttributeValueInObject(clone, cloneAttributeValue);
}
/**
* INTERNAL:
* Build and return a clone of the attribute.
*/
protected Object buildClonePart(Object original, Object clone, CacheKey cacheKey, Object attributeValue, Integer refreshCascade, AbstractSession cloningSession) {
return buildClonePart(attributeValue, clone, cacheKey, refreshCascade, cloningSession, cloningSession.isUnitOfWork() && ((UnitOfWorkImpl)cloningSession).isOriginalNewObject(original));
}
/**
* INTERNAL: * Build and return a clone of the attribute.
*/
protected Object buildClonePart(Object attributeValue, Object clone, CacheKey parentCacheKey, Integer refreshCascade, AbstractSession cloningSession, boolean isNewObject) {
if (attributeValue == null) {
return null;
}
if (cloningSession.isUnitOfWork() && isNewObject) { // only true if cloningSession is UOW as this signature only exists in this mapping.
((UnitOfWorkImpl)cloningSession).addNewAggregate(attributeValue);
}
// Do not clone for read-only.
if (cloningSession.isUnitOfWork() && cloningSession.isClassReadOnly(attributeValue.getClass())){
return attributeValue;
}
ObjectBuilder aggregateObjectBuilder = getObjectBuilder(attributeValue, cloningSession);
// bug 2612602 as we are building the working copy make sure that we call to correct clone method.
Object clonedAttributeValue = aggregateObjectBuilder.instantiateWorkingCopyClone(attributeValue, cloningSession);
aggregateObjectBuilder.populateAttributesForClone(attributeValue, parentCacheKey, clonedAttributeValue, refreshCascade, cloningSession);
//also clone the fetch group reference if applied
if (aggregateObjectBuilder.getDescriptor().hasFetchGroupManager()) {
aggregateObjectBuilder.getDescriptor().getFetchGroupManager().copyAggregateFetchGroupInto(attributeValue, clonedAttributeValue, clone, cloningSession);
}
return clonedAttributeValue;
}
/**
* INTERNAL:
* Copy of the attribute of the object.
* This is NOT used for unit of work but for templatizing an object.
*/
@Override
public void buildCopy(Object copy, Object original, CopyGroup group) {
Object attributeValue = getAttributeValueFromObject(original);
setAttributeValueInObject(copy, buildCopyOfAttributeValue(attributeValue, group));
}
/**
* Copy of the attribute of the object.
* This is NOT used for unit of work but for templatizing an object.
*/
protected Object buildCopyOfAttributeValue(Object attributeValue, CopyGroup group) {
if (attributeValue == null) {
return null;
}
return getObjectBuilder(attributeValue, group.getSession()).copyObject(attributeValue, group);
}
/**
* INTERNAL:
* In case Query By Example is used, this method generates an expression from a attribute value pair. Since
* this is an Aggregate mapping, a recursive call is made to the buildExpressionFromExample method of
* ObjectBuilder.
*/
@Override
public Expression buildExpression(Object queryObject, QueryByExamplePolicy policy, Expression expressionBuilder, Map processedObjects, AbstractSession session) {
String attributeName = this.getAttributeName();
Object attributeValue = this.getRealAttributeValueFromObject(queryObject, session);
if (!policy.shouldIncludeInQuery(queryObject.getClass(), attributeName, attributeValue)) {
//the attribute name and value pair is not to be included in the query.
return null;
}
if (attributeValue == null) {
//even though it is null, it is to be always included in the query
Expression expression = expressionBuilder.get(attributeName);
return policy.completeExpressionForNull(expression);
}
ObjectBuilder objectBuilder = getReferenceDescriptor().getObjectBuilder();
return objectBuilder.buildExpressionFromExample(attributeValue, policy, expressionBuilder.get(attributeName), processedObjects, session);
}
/**
* INTERNAL:
* Build and return a new instance of the specified attribute.
* This will be populated by a merge.
*/
protected Object buildNewMergeInstanceOf(Object sourceAttributeValue, AbstractSession session) {
return getObjectBuilder(sourceAttributeValue, session).buildNewInstance();
}
/**
* INTERNAL:
* Cascade perform delete through mappings that require the cascade
*/
// public void cascadePerformDeleteIfRequired(Object object, UnitOfWork uow, Map visitedObjects){
//objects referenced by this mapping are not registered as they have
// no identity, this is a no-op.
// }
/**
* INTERNAL:
* Cascade registerNew for Create through mappings that require the cascade
*/
// public void cascadeRegisterNewIfRequired(Object object, UnitOfWork uow, Map visitedObjects){
//aggregate objects are not registeres as they have no identity, this is a no-op.
// }
/**
* INTERNAL:
* Compare the attributes. Return true if they are alike.
*/
protected boolean compareAttributeValues(Object attributeValue1, Object attributeValue2, AbstractSession session) {
if ((attributeValue1 == null) && (attributeValue2 == null)) {
return true;
}
if ((attributeValue1 == null) || (attributeValue2 == null)) {
return false;
}
if (attributeValue1.getClass() != attributeValue2.getClass()) {
return false;
}
return getObjectBuilder(attributeValue1, session).compareObjects(attributeValue1, attributeValue2, session);
}
/**
* INTERNAL:
* Compare the changes between two aggregates.
* Return a change record holding the changes.
*/
@Override
public ChangeRecord compareForChange(Object clone, Object backup, ObjectChangeSet owner, AbstractSession session) {
Object cloneAttribute = getAttributeValueFromObject(clone);
Object backupAttribute = null;
if (!owner.isNew()) {
backupAttribute = getAttributeValueFromObject(backup);
if ((cloneAttribute == null) && (backupAttribute == null)) {
return null;// no change
}
if ((cloneAttribute != null) && (backupAttribute != null) && (!cloneAttribute.getClass().equals(backupAttribute.getClass()))) {
backupAttribute = null;
}
}
AggregateChangeRecord changeRecord = new AggregateChangeRecord(owner);
changeRecord.setAttribute(getAttributeName());
changeRecord.setMapping(this);
changeRecord.setOldValue(backupAttribute);
if (cloneAttribute == null) {// the attribute was set to null
changeRecord.setChangedObject(null);
return changeRecord;
}
ObjectBuilder builder = getObjectBuilder(cloneAttribute, session);
//if the owner is new then the backup will be null, if the owner is new then the aggregate is new
//if the backup is null but the owner is not new then this aggregate is new
ObjectChangeSet initialChanges = builder.createObjectChangeSet(cloneAttribute, (UnitOfWorkChangeSet)owner.getUOWChangeSet(), (backupAttribute == null), session);
ObjectChangeSet changeSet = builder.compareForChange(cloneAttribute, backupAttribute, (UnitOfWorkChangeSet)owner.getUOWChangeSet(), session);
if (changeSet == null) {
if (initialChanges.isNew()) {
// This happens if original aggregate is of class A, the new aggregate
// is of class B (B inherits from A) - and neither A nor B has any mapped attributes.
// CR3664
changeSet = initialChanges;
} else {
return null;// no change
}
}
changeRecord.setChangedObject(changeSet);
return changeRecord;
}
/**
* INTERNAL:
* Compare the attributes belonging to this mapping for the objects.
*/
@Override
public boolean compareObjects(Object firstObject, Object secondObject, AbstractSession session) {
return compareAttributeValues(getAttributeValueFromObject(firstObject), getAttributeValueFromObject(secondObject), session);
}
/**
* INTERNAL:
* Convert all the class-name-based settings in this mapping to actual class-based
* settings. This method is used when converting a project that has been built
* with class names to a project with classes.
*/
@Override
public void convertClassNamesToClasses(ClassLoader classLoader) {
super.convertClassNamesToClasses(classLoader);
if (getReferenceClassName() != null) {
try {
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()) {
try {
setReferenceClass(AccessController.doPrivileged(new PrivilegedClassForName<>(getReferenceClassName(), true, classLoader)));
} catch (PrivilegedActionException exception) {
throw ValidationException.classNotFoundWhileConvertingClassNames(getReferenceClassName(), exception.getException());
}
} else {
setReferenceClass(org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getClassForName(getReferenceClassName(), true, classLoader));
}
} catch (ClassNotFoundException exc) {
throw ValidationException.classNotFoundWhileConvertingClassNames(getReferenceClassName(), exc);
}
}
}
/**
* INTERNAL:
* Execute a descriptor event for the specified event code.
*/
protected void executeEvent(int eventCode, ObjectLevelModifyQuery query) {
ClassDescriptor referenceDescriptor = getReferenceDescriptor(query.getObject(), query.getSession());
// PERF: Avoid events if no listeners.
if (referenceDescriptor.getEventManager().hasAnyEventListeners()) {
referenceDescriptor.getEventManager().executeEvent(new org.eclipse.persistence.descriptors.DescriptorEvent(eventCode, query));
}
}
/**
* INTERNAL:
* An object has been serialized from the server to the remote client.
* Replace the transient attributes of the remote value holders
* with client-side objects.
*/
protected void fixAttributeValue(Object attributeValue, Map objectDescriptors, Map processedObjects, ObjectLevelReadQuery query, DistributedSession session) {
if (attributeValue == null) {
return;
}
getObjectBuilder(attributeValue, query.getSession()).fixObjectReferences(attributeValue, objectDescriptors, processedObjects, query, session);
}
/**
* INTERNAL:
* An object has been serialized from the server to the remote client.
* Replace the transient attributes of the remote value holders
* with client-side objects.
*/
@Override
public void fixObjectReferences(Object object, Map objectDescriptors, Map processedObjects, ObjectLevelReadQuery query, DistributedSession session) {
Object attributeValue = getAttributeValueFromObject(object);
fixAttributeValue(attributeValue, objectDescriptors, processedObjects, query, session);
}
/**
* Return the appropriate attribute value.
* This method is a hack to allow the aggregate collection
* subclass to override....
*/
protected Object getAttributeValueFromBackupClone(Object backupClone) {
return getAttributeValueFromObject(backupClone);
}
/**
* Convenience method
*/
protected ObjectBuilder getObjectBuilderForClass(Class javaClass, AbstractSession session) {
return getReferenceDescriptor(javaClass, session).getObjectBuilder();
}
/**
* Convenience method
*/
protected ObjectBuilder getObjectBuilder(Object attributeValue, AbstractSession session) {
return getReferenceDescriptor(attributeValue, session).getObjectBuilder();
}
/**
* Convenience method
*/
protected DescriptorQueryManager getQueryManager(Object attributeValue, AbstractSession session) {
return getReferenceDescriptor(attributeValue, session).getQueryManager();
}
/**
* PUBLIC:
* Returns the reference class
*/
public Class getReferenceClass() {
return referenceClass;
}
/**
* INTERNAL:
* Used by MW.
*/
public String getReferenceClassName() {
if ((referenceClassName == null) && (referenceClass != null)) {
referenceClassName = referenceClass.getName();
}
return referenceClassName;
}
/**
* INTERNAL:
* Return the referenceDescriptor. This is a descriptor which is associated with the reference class.
* NOTE: If you are looking for the descriptor for a specific aggregate object, use
* #getReferenceDescriptor(Object). This will ensure you get the right descriptor if the object's
* descriptor is part of an inheritance tree.
*/
@Override
public ClassDescriptor getReferenceDescriptor() {
return referenceDescriptor;
}
/**
* INTERNAL:
* For inheritance purposes.
*/
protected ClassDescriptor getReferenceDescriptor(Class theClass, AbstractSession session) {
if (this.referenceDescriptor.getJavaClass() == theClass) {
return this.referenceDescriptor;
}
ClassDescriptor subDescriptor = session.getDescriptor(theClass);
if (subDescriptor == null) {
throw DescriptorException.noSubClassMatch(theClass, this);
} else {
return subDescriptor;
}
}
/**
* Convenience method
*/
protected ClassDescriptor getReferenceDescriptor(Object attributeValue, AbstractSession session) {
if (attributeValue == null) {
return this.referenceDescriptor;
} else {
return getReferenceDescriptor(attributeValue.getClass(), session);
}
}
/**
* INTERNAL:
* Indicates whether the mapping (or at least one of its nested mappings, at any nested depth)
* references an entity.
* To return true the mapping (or nested mapping) should be ForeignReferenceMapping with non-null and non-aggregate reference descriptor.
*/
@Override
public boolean hasNestedIdentityReference() {
if (hasNestedIdentityReference == null) {
hasNestedIdentityReference = getReferenceDescriptor().hasNestedIdentityReference(true);
}
return hasNestedIdentityReference;
}
/**
* INTERNAL:
* Initialize the reference descriptor.
*/
@Override
public void initialize(AbstractSession session) throws DescriptorException {
super.initialize(session);
if (getReferenceClass() == null) {
throw DescriptorException.referenceClassNotSpecified(this);
}
setReferenceDescriptor(session.getDescriptor(getReferenceClass()));
ClassDescriptor refDescriptor = this.getReferenceDescriptor();
if (refDescriptor == null) {
session.getIntegrityChecker().handleError(DescriptorException.descriptorIsMissing(getReferenceClass().getName(), this));
return;
}
if (refDescriptor.isDescriptorTypeAggregate()) {
refDescriptor.checkInheritanceTreeAggregateSettings(session, this);
} else {
session.getIntegrityChecker().handleError(DescriptorException.referenceDescriptorIsNotAggregate(getReferenceClass().getName(), this));
}
}
/**
* INTERNAL:
* Related mapping should implement this method to return true.
*/
@Override
public boolean isAggregateMapping() {
return true;
}
/**
* INTERNAL:
* Iterate on the appropriate attribute value.
*/
@Override
public void iterate(DescriptorIterator iterator) {
iterateOnAttributeValue(iterator, getAttributeValueFromObject(iterator.getVisitedParent()));
}
/**
* Iterate on the specified attribute value.
*/
protected void iterateOnAttributeValue(DescriptorIterator iterator, Object attributeValue) {
iterator.iterateForAggregateMapping(attributeValue, this, getReferenceDescriptor(attributeValue, iterator.getSession()));
}
/**
* Force instantiation of the load group.
*/
@Override
public void load(final Object object, AttributeItem item, final AbstractSession session, final boolean fromFetchGroup) {
if (item.getGroup() != null) {
Object value = getAttributeValueFromObject(object);
if (value != null) {
getObjectBuilder(value, session).load(value, item.getGroup(), session, fromFetchGroup);
}
}
}
/**
* Force instantiation of all indirections.
*/
@Override
public void loadAll(Object object, AbstractSession session, IdentityHashSet loaded) {
Object value = getAttributeValueFromObject(object);
if (value != null) {
getObjectBuilder(value, session).loadAll(value, session);
}
}
/**
* Merge the attribute values.
*/
protected void mergeAttributeValue(Object targetAttributeValue, boolean isTargetUnInitialized, Object sourceAttributeValue, MergeManager mergeManager, AbstractSession targetSession) {
// don't merge read-only attributes
if (mergeManager.getSession().isClassReadOnly(sourceAttributeValue.getClass())) {
return;
}
if (mergeManager.getSession().isClassReadOnly(targetAttributeValue.getClass())) {
return;
}
// Toggle change tracking during the merge.
ClassDescriptor descriptor = getReferenceDescriptor(sourceAttributeValue, mergeManager.getSession());
descriptor.getObjectChangePolicy().dissableEventProcessing(targetAttributeValue);
try {
descriptor.getObjectBuilder().mergeIntoObject(targetAttributeValue, isTargetUnInitialized, sourceAttributeValue, mergeManager, targetSession);
} finally {
descriptor.getObjectChangePolicy().enableEventProcessing(targetAttributeValue);
}
}
/**
* INTERNAL:
* Merge changes from the source to the target object.
* With aggregates the merge must cascade to the object changes for the aggregate object
* because aggregate objects have no identity outside of themselves.
* The actual aggregate object does not need to be replaced, because even if the clone references
* another aggregate it appears the same to TopLink
*/
@Override
public void mergeChangesIntoObject(Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager, AbstractSession targetSession) {
ObjectChangeSet aggregateChangeSet = (ObjectChangeSet)((AggregateChangeRecord)changeRecord).getChangedObject();
if (aggregateChangeSet == null) {// the change was to set the value to null
setAttributeValueInObject(target, null);
return;
}
Object sourceAggregate = null;
if (source != null) {
sourceAggregate = getAttributeValueFromObject(source);
}
ObjectBuilder objectBuilder = getObjectBuilderForClass(aggregateChangeSet.getClassType(mergeManager.getSession()), mergeManager.getSession());
//Bug#4719341 Always obtain aggregate attribute value from the target object regardless of new or not
Object targetAggregate = getAttributeValueFromObject(target);
boolean wasOriginalNull = false;
if (targetAggregate == null || targetAggregate == sourceAggregate) {
targetAggregate = objectBuilder.buildNewInstance();
wasOriginalNull = true;
} else {
//bug 205939 - use the type from the changeset to determine if a new aggregate instance
//is needed because of a class change. The old way of using the sourceAggregate will not
//work on a remote system after cache sync because the sourceAggregate will not be available
if (aggregateChangeSet.getClassType(mergeManager.getSession()) != targetAggregate.getClass()) {
targetAggregate = objectBuilder.buildNewInstance();
wasOriginalNull = true;
}
}
objectBuilder.mergeChangesIntoObject(targetAggregate, aggregateChangeSet, sourceAggregate, mergeManager, targetSession,false, wasOriginalNull);
setAttributeValueInObject(target, targetAggregate);
}
/**
* INTERNAL:
* Merge changes from the source to the target object. This merge is only called when a changeSet for the target
* does not exist or the target is uninitialized
*/
@Override
public void mergeIntoObject(Object target, boolean isTargetUnInitialized, Object source, MergeManager mergeManager, AbstractSession targetSession) {
Object sourceAttributeValue = getAttributeValueFromObject(source);
if (sourceAttributeValue == null) {
setAttributeValueInObject(target, null);
return;
}
Object targetAttributeValue = getAttributeValueFromObject(target);
boolean originalWasNull = targetAttributeValue == null;
if (targetAttributeValue == null || targetAttributeValue == sourceAttributeValue || !targetAttributeValue.getClass().equals(sourceAttributeValue.getClass())) {
// avoid null-pointer/nothing to merge to - create a new instance
// (a new clone cannot be used as all changes must be merged)
targetAttributeValue = buildNewMergeInstanceOf(sourceAttributeValue, mergeManager.getSession());
mergeAttributeValue(targetAttributeValue, true, sourceAttributeValue, mergeManager, targetSession);
// setting new instance so fire event as if set was called by user.
// this call will eventually get passed to updateChangeRecord which will
//ensure this new aggregates is fully initialized with listeners.
// If merge into the unit of work, must only merge and raise the event is the value changed.
if ((mergeManager.shouldMergeCloneIntoWorkingCopy() || mergeManager.shouldMergeCloneWithReferencesIntoWorkingCopy()) && !mergeManager.isForRefresh()) {
this.descriptor.getObjectChangePolicy().raiseInternalPropertyChangeEvent(target, getAttributeName(), getAttributeValueFromObject(target), targetAttributeValue);
}
} else {
mergeAttributeValue(targetAttributeValue, isTargetUnInitialized, sourceAttributeValue, mergeManager, targetSession);
}
if(this.descriptor.hasFetchGroupManager()) {
FetchGroup sourceFetchGroup = this.descriptor.getFetchGroupManager().getObjectFetchGroup(source);
FetchGroup targetFetchGroup = this.descriptor.getFetchGroupManager().getObjectFetchGroup(target);
if(targetFetchGroup != null) {
if(!targetFetchGroup.isSupersetOf(sourceFetchGroup)) {
targetFetchGroup.onUnfetchedAttribute((FetchGroupTracker)target, null);
}
} else if (originalWasNull && sourceFetchGroup != null){
this.descriptor.getFetchGroupManager().setObjectFetchGroup(target, sourceFetchGroup, targetSession);
}
}
// Must re-set variable to allow for set method to re-morph changes.
setAttributeValueInObject(target, targetAttributeValue);
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
@Override
public void postDelete(DeleteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (!isReadOnly()) {
postDeleteAttributeValue(query, getAttributeValueFromObject(query.getObject()));
}
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
public void postDeleteAttributeValue(DeleteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
// PERF: Avoid for simple aggregates.
ClassDescriptor descriptor = getReferenceDescriptor(attributeValue, query.getSession());
if (descriptor.getObjectBuilder().isSimple() && !descriptor.getEventManager().hasAnyEventListeners()) {
return;
}
DeleteObjectQuery aggregateQuery = buildAggregateDeleteQuery(query, attributeValue);
descriptor.getQueryManager().postDelete(aggregateQuery);
executeEvent(DescriptorEventManager.PostDeleteEvent, aggregateQuery);
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
@Override
public void postInsert(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (!isReadOnly()) {
postInsertAttributeValue(query, getAttributeValueFromObject(query.getObject()));
}
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
public void postInsertAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
// PERF: Avoid for simple aggregates.
ClassDescriptor descriptor = getReferenceDescriptor(attributeValue, query.getSession());
if (descriptor.getObjectBuilder().isSimple() && !descriptor.getEventManager().hasAnyEventListeners()) {
return;
}
WriteObjectQuery aggregateQuery = buildAggregateWriteQuery(query, attributeValue);
descriptor.getQueryManager().postInsert(aggregateQuery);
executeEvent(DescriptorEventManager.PostInsertEvent, aggregateQuery);
// aggregates do not actually use a query to write to the database so the post write must be called here
executeEvent(DescriptorEventManager.PostWriteEvent, aggregateQuery);
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
@Override
public void postUpdate(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (!isReadOnly()) {
postUpdateAttributeValue(query, getAttributeValueFromObject(query.getObject()));
}
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
public void postUpdateAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
// PERF: Avoid for simple aggregates.
AbstractSession session = query.getSession();
ClassDescriptor descriptor = getReferenceDescriptor(attributeValue, session);
if (descriptor.getObjectBuilder().isSimple() && !descriptor.getEventManager().hasAnyEventListeners()) {
return;
}
ObjectChangeSet changeSet = null;
UnitOfWorkChangeSet uowChangeSet = null;
if (session.isUnitOfWork() && (((UnitOfWorkImpl)session).getUnitOfWorkChangeSet() != null)) {
uowChangeSet = (UnitOfWorkChangeSet)((UnitOfWorkImpl)session).getUnitOfWorkChangeSet();
changeSet = (ObjectChangeSet)uowChangeSet.getObjectChangeSetForClone(attributeValue);
}
WriteObjectQuery aggregateQuery = buildAggregateWriteQuery(query, attributeValue);
aggregateQuery.setObjectChangeSet(changeSet);
descriptor.getQueryManager().postUpdate(aggregateQuery);
executeEvent(DescriptorEventManager.PostUpdateEvent, aggregateQuery);
// aggregates do not actually use a query to write to the database so the post write must be called here
executeEvent(DescriptorEventManager.PostWriteEvent, aggregateQuery);
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
@Override
public void preDelete(DeleteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (!isReadOnly()) {
preDeleteAttributeValue(query, getAttributeValueFromObject(query.getObject()));
}
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
public void preDeleteAttributeValue(DeleteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
// PERF: Avoid for simple aggregates.
AbstractSession session = query.getSession();
ClassDescriptor descriptor = getReferenceDescriptor(attributeValue, session);
if (descriptor.getObjectBuilder().isSimple() && !descriptor.getEventManager().hasAnyEventListeners()) {
return;
}
DeleteObjectQuery aggregateQuery = buildAggregateDeleteQuery(query, attributeValue);
executeEvent(DescriptorEventManager.PreDeleteEvent, aggregateQuery);
descriptor.getQueryManager().preDelete(aggregateQuery);
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
@Override
public void preInsert(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (!isReadOnly()) {
preInsertAttributeValue(query, getAttributeValueFromObject(query.getObject()));
}
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
public void preInsertAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
// PERF: Avoid for simple aggregates.
AbstractSession session = query.getSession();
ClassDescriptor descriptor = getReferenceDescriptor(attributeValue, session);
if (descriptor.getObjectBuilder().isSimple() && !descriptor.getEventManager().hasAnyEventListeners()) {
return;
}
WriteObjectQuery aggregateQuery = buildAggregateWriteQuery(query, attributeValue);
ObjectChangeSet changeSet = null;
if (session.isUnitOfWork() && (((UnitOfWorkImpl)session).getUnitOfWorkChangeSet() != null)) {
UnitOfWorkChangeSet uowChangeSet = (UnitOfWorkChangeSet)((UnitOfWorkImpl)session).getUnitOfWorkChangeSet();
changeSet = (ObjectChangeSet)uowChangeSet.getObjectChangeSetForClone(aggregateQuery.getObject());
}
aggregateQuery.setObjectChangeSet(changeSet);
// aggregates do not actually use a query to write to the database so the pre-write must be called here
if (changeSet == null) {// then we didn't fire events at calculations
executeEvent(DescriptorEventManager.PreWriteEvent, aggregateQuery);
executeEvent(DescriptorEventManager.PreInsertEvent, aggregateQuery);
}
descriptor.getQueryManager().preInsert(aggregateQuery);
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
@Override
public void preUpdate(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (!isReadOnly()) {
preUpdateAttributeValue(query, getAttributeValueFromObject(query.getObject()));
}
}
/**
* INTERNAL:
* The message is passed to its reference class descriptor.
*/
public void preUpdateAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
// PERF: Avoid for simple aggregates.
AbstractSession session = query.getSession();
ClassDescriptor descriptor = getReferenceDescriptor(attributeValue, session);
if (descriptor.getObjectBuilder().isSimple() && !descriptor.getEventManager().hasAnyEventListeners()) {
return;
}
WriteObjectQuery aggregateQuery = buildAggregateWriteQuery(query, attributeValue);
ObjectChangeSet changeSet = null;
UnitOfWorkChangeSet uowChangeSet = null;
if (session.isUnitOfWork() && (((UnitOfWorkImpl)session).getUnitOfWorkChangeSet() != null)) {
uowChangeSet = (UnitOfWorkChangeSet)((UnitOfWorkImpl)session).getUnitOfWorkChangeSet();
changeSet = (ObjectChangeSet)uowChangeSet.getObjectChangeSetForClone(aggregateQuery.getObject());
}
aggregateQuery.setObjectChangeSet(changeSet);
// aggregates do not actually use a query to write to the database so the pre-write must be called here
if (changeSet == null) {// then we didn't fire events at calculations
executeEvent(DescriptorEventManager.PreWriteEvent, aggregateQuery);
executeEvent(DescriptorEventManager.PreUpdateEvent, aggregateQuery);
}
descriptor.getQueryManager().preUpdate(aggregateQuery);
}
/**
* INTERNAL:
* Once a descriptor is serialized to the remote session, all its mappings and reference descriptors are traversed.
* Usually the mappings are initialized and the serialized reference descriptors are replaced with local descriptors
* if they already exist in the remote session.
*/
@Override
public void remoteInitialization(DistributedSession session) {
super.remoteInitialization(session);
ClassDescriptor refDescriptor = getReferenceDescriptor();
if (session.hasCorrespondingDescriptor(refDescriptor)) {
ClassDescriptor correspondingDescriptor = session.getDescriptorCorrespondingTo(refDescriptor);
setReferenceDescriptor(correspondingDescriptor);
} else {
session.privilegedAddDescriptor(refDescriptor);
refDescriptor.remoteInitialization(session);
}
}
/**
* PUBLIC:
* This is a reference class whose instances this mapping will store in the domain objects.
*/
public void setReferenceClass(Class aClass) {
referenceClass = aClass;
}
/**
* INTERNAL:
* Used by MW.
*/
public void setReferenceClassName(String aClassName) {
referenceClassName = aClassName;
}
/**
* INTERNAL:
* Set the referenceDescriptor. This is a descriptor which is associated with
* the reference class.
*/
protected void setReferenceDescriptor(ClassDescriptor aDescriptor) {
referenceDescriptor = aDescriptor;
}
/**
* INTERNAL:
* Either create a new change record or update the change record with the new value.
* This is used by attribute change tracking.
*/
@Override
public void updateChangeRecord(Object sourceClone, Object newValue, Object oldValue, ObjectChangeSet objectChangeSet, UnitOfWorkImpl uow) throws DescriptorException {
//This method will be called when either the referenced aggregate has
//been changed or a component of the referenced aggregate has been changed
//this case is determined by the value of the sourceClone
boolean isNewRecord = false;
AggregateChangeRecord changeRecord = (AggregateChangeRecord)objectChangeSet.getChangesForAttributeNamed(this.getAttributeName());
if (changeRecord == null){
changeRecord = new AggregateChangeRecord(objectChangeSet);
changeRecord.setAttribute(this.getAttributeName());
changeRecord.setMapping(this);
objectChangeSet.addChange(changeRecord);
isNewRecord = true;
}
if ( sourceClone.getClass().equals(objectChangeSet.getClassType(uow)) ) {
if (isNewRecord) {
changeRecord.setOldValue(oldValue);
}
// event was fired on the parent to the aggregate, the attribute value changed.
ClassDescriptor referenceDescriptor = getReferenceDescriptor(newValue, uow);
if ( newValue == null ) { // attribute set to null
changeRecord.setChangedObject(null);
if (referenceDescriptor.getObjectChangePolicy().isAttributeChangeTrackingPolicy()){
if(((ChangeTracker)oldValue)._persistence_getPropertyChangeListener() != null) {
//need to detach listener
((AggregateAttributeChangeListener)((ChangeTracker)oldValue)._persistence_getPropertyChangeListener()).setParentListener(null);
}
}
return;
}else{ // attribute set to new aggregate
UnitOfWorkChangeSet uowChangeSet = (UnitOfWorkChangeSet)objectChangeSet.getUOWChangeSet();
//force comparison change detection to build changeset.
ObjectChangeSet aggregateChangeSet = (ObjectChangeSet)uowChangeSet.getObjectChangeSetForClone(newValue);
if (aggregateChangeSet != null && aggregateChangeSet.getDescriptor() == referenceDescriptor) {
aggregateChangeSet.clear(true); // old differences must be thrown away because difference is between old value and new value
}
//make sure the listener is initialized
if (referenceDescriptor.getObjectChangePolicy().isAttributeChangeTrackingPolicy()){
if(oldValue != null && ((ChangeTracker)oldValue)._persistence_getPropertyChangeListener() != null) {
//need to detach listener
((AggregateAttributeChangeListener)((ChangeTracker)oldValue)._persistence_getPropertyChangeListener()).setParentListener(null);
}
//need to attach new listener.
AggregateAttributeChangeListener newListener = (AggregateAttributeChangeListener)((ChangeTracker)newValue)._persistence_getPropertyChangeListener();
if (newListener == null){
newListener = new AggregateAttributeChangeListener(referenceDescriptor, uow, ((AttributeChangeListener)((ChangeTracker)sourceClone)._persistence_getPropertyChangeListener()), this.getAttributeName(), newValue);
((ChangeTracker)newValue)._persistence_setPropertyChangeListener(newListener);
}
newListener.setParentListener((AttributeChangeListener)((ChangeTracker)sourceClone)._persistence_getPropertyChangeListener());
if (changeRecord.getChangedObject() != null && changeRecord.getChangedObject().hasChanges()) {
// the oldValue has been already changed - get the original oldValue.
oldValue = changeRecord.getOldValue();
}
if (oldValue != null) {
if(referenceDescriptor != getReferenceDescriptor(oldValue, uow)) {
// oldValue and newValue belong to different types - have to start from scratch.
oldValue = null;
}
}
}
//force comparison change detection to build changeset.
changeRecord.setChangedObject(referenceDescriptor.getObjectChangePolicy().createObjectChangeSetThroughComparison(newValue,oldValue, uowChangeSet, (oldValue == null), uow, referenceDescriptor));
// process nested aggregates
for(DatabaseMapping mapping : referenceDescriptor.getMappings()) {
if(mapping.isAggregateObjectMapping()) {
Object nestedNewValue = mapping.getAttributeValueFromObject(newValue);
Object nestedOldValue = null;
if(oldValue != null) {
nestedOldValue = mapping.getAttributeValueFromObject(oldValue);
}
// bug #413120 - update nested change record only if the value is different
if (nestedNewValue != nestedOldValue) {
mapping.updateChangeRecord(newValue, nestedNewValue, nestedOldValue, (org.eclipse.persistence.internal.sessions.ObjectChangeSet)changeRecord.getChangedObject(), uow);
}
}
}
referenceDescriptor.getObjectChangePolicy().setChangeSetOnListener((ObjectChangeSet)changeRecord.getChangedObject(), newValue);
}
} else {
//a value was set on the aggregate but the aggregate was not changed.
if (referenceDescriptor.getObjectChangePolicy().isAttributeChangeTrackingPolicy()){
//The aggregate that is referenced is Attribute Change Tracked as well.
changeRecord.setChangedObject(((AggregateAttributeChangeListener)((ChangeTracker)sourceClone)._persistence_getPropertyChangeListener()).getObjectChangeSet());
} else {
// not tracked at attribute level, lets force build a changeset then.
changeRecord.setChangedObject(referenceDescriptor.getObjectChangePolicy().createObjectChangeSetThroughComparison(sourceClone, null, (UnitOfWorkChangeSet)objectChangeSet.getUOWChangeSet(), true, uow, referenceDescriptor));
}
}
}
/**
* INTERNAL:
* Return whether the specified object and all its components have been deleted.
*/
@Override
public boolean verifyDelete(Object object, AbstractSession session) throws DatabaseException {
return verifyDeleteOfAttributeValue(getAttributeValueFromObject(object), session);
}
/**
* INTERNAL:
* Return whether the specified object and all its components have been deleted.
*/
protected boolean verifyDeleteOfAttributeValue(Object attributeValue, AbstractSession session) throws DatabaseException {
if (attributeValue == null) {
return true;
}
for (Enumeration mappings = getReferenceDescriptor(attributeValue, session).getMappings().elements();
mappings.hasMoreElements();) {
DatabaseMapping mapping = mappings.nextElement();
if (!mapping.verifyDelete(attributeValue, session)) {
return false;
}
}
return true;
}
}