org.eclipse.persistence.mappings.foundation.AbstractCompositeCollectionMapping Maven / Gradle / Ivy
Show all versions of org.eclipse.persistence.core Show documentation
/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. 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
package org.eclipse.persistence.mappings.foundation;
import java.util.*;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.exceptions.*;
import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.internal.descriptors.*;
import org.eclipse.persistence.internal.helper.*;
import org.eclipse.persistence.internal.identitymaps.CacheKey;
import org.eclipse.persistence.internal.queries.*;
import org.eclipse.persistence.internal.sessions.*;
import org.eclipse.persistence.mappings.*;
import org.eclipse.persistence.mappings.converters.Converter;
import org.eclipse.persistence.mappings.structures.ArrayCollectionMapping;
import org.eclipse.persistence.mappings.structures.ArrayCollectionMappingHelper;
import org.eclipse.persistence.queries.*;
import org.eclipse.persistence.sessions.remote.*;
import org.eclipse.persistence.sessions.CopyGroup;
/**
* Define an embedded collection of objects.
* This is used in structured data-types, such as EIS, NoSQL and object-relational Array (varray, nested table) data-types.
* The target objects must be aggregate (embedded) and are stored with the parent object.
*/
public abstract class AbstractCompositeCollectionMapping extends AggregateMapping implements ContainerMapping, ArrayCollectionMapping {
/** The aggregate objects are stored in a single field. */
protected DatabaseField field;
/** This determines the type of container used to hold the aggregate objects. */
private ContainerPolicy containerPolicy;
/** Allows user defined conversion between the object attribute value and the database value. */
protected Converter converter;
/**
* Default constructor.
*/
public AbstractCompositeCollectionMapping() {
super();
this.containerPolicy = ContainerPolicy.buildDefaultPolicy();
}
/**
* INTERNAL:
* Build and return a new element based on the change set.
*/
public Object buildAddedElementFromChangeSet(Object changeSet, MergeManager mergeManager, AbstractSession targetSession) {
return this.buildElementFromChangeSet(changeSet, mergeManager, targetSession);
}
/**
* Build and return a backup clone of the attribute.
*/
@Override
protected Object buildBackupClonePart(Object attributeValue, UnitOfWorkImpl unitOfWork) {
ContainerPolicy cp = this.getContainerPolicy();
if (attributeValue == null) {
return cp.containerInstance();
}
Object backupAttributeValue = cp.containerInstance(cp.sizeFor(attributeValue));
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
Object backupElement = super.buildBackupClonePart(cp.next(iter, unitOfWork), unitOfWork);
cp.addInto(backupElement, backupAttributeValue, unitOfWork);
}
return backupAttributeValue;
}
/**
* INTERNAL:
* Build and return a change set for the specified element.
*/
public Object buildChangeSet(Object element, ObjectChangeSet owner, AbstractSession session) {
ObjectBuilder objectBuilder = this.getObjectBuilder(element, session);
return objectBuilder.compareForChange(element, null, (UnitOfWorkChangeSet)owner.getUOWChangeSet(), session);
}
/**
* Build and return a clone of the attribute.
*/
@Override
protected Object buildClonePart(Object original, Object clone, CacheKey cacheKey, Object attributeValue, Integer refreshCascade, AbstractSession clonningSession) {
ContainerPolicy cp = this.getContainerPolicy();
if (attributeValue == null) {
return cp.containerInstance();
}
Object clonedAttributeValue = cp.containerInstance(cp.sizeFor(attributeValue));
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
Object cloneElement = super.buildClonePart(original, clone, cacheKey, cp.next(iter, clonningSession), refreshCascade, clonningSession);
cp.addInto(cloneElement, clonedAttributeValue, clonningSession);
}
return clonedAttributeValue;
}
/**
* Copy of the attribute of the object.
* This is NOT used for unit of work but for templatizing an object.
*/
@Override
protected Object buildCopyOfAttributeValue(Object attributeValue, CopyGroup group) {
ContainerPolicy cp = this.getContainerPolicy();
if (attributeValue == null) {
return cp.containerInstance();
}
Object attributeValueCopy = cp.containerInstance(cp.sizeFor(attributeValue));
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
Object copyElement = super.buildCopyOfAttributeValue(cp.next(iter, group.getSession()), group);
cp.addInto(copyElement, attributeValueCopy, group.getSession());
}
return attributeValueCopy;
}
/**
* Build and return a new element based on the change set.
*/
protected Object buildElementFromChangeSet(Object changeSet, MergeManager mergeManager, AbstractSession targetSession) {
ObjectChangeSet objectChangeSet = (ObjectChangeSet)changeSet;
ObjectBuilder objectBuilder = this.getObjectBuilderForClass(objectChangeSet.getClassType(mergeManager.getSession()), mergeManager.getSession());
Object result = objectBuilder.buildNewInstance();
objectBuilder.mergeChangesIntoObject(result, objectChangeSet, null, mergeManager, targetSession);
return result;
}
/**
* INTERNAL:
* Build and return a new element based on the specified element.
*/
public Object buildElementFromElement(Object element, MergeManager mergeManager, AbstractSession targetSession) {
ObjectBuilder objectBuilder = this.getObjectBuilder(element, mergeManager.getSession());
Object result = objectBuilder.buildNewInstance();
objectBuilder.mergeIntoObject(result, true, element, mergeManager, targetSession);
return result;
}
/**
* INTERNAL:
* In case Query By Example is used, this method builds and returns an expression that
* corresponds to a single attribute and it's value.
*/
public Expression buildExpression(Object queryObject, QueryByExamplePolicy policy, Expression expressionBuilder, Map processedObjects, AbstractSession session) {
if (policy.shouldValidateExample()){
throw QueryException.unsupportedMappingQueryByExample(queryObject.getClass().getName(), this);
}
return null;
}
/**
* INTERNAL:
* Build and return a new element based on the change set.
*/
public Object buildRemovedElementFromChangeSet(Object changeSet, MergeManager mergeManager, AbstractSession targetSession) {
return this.buildElementFromChangeSet(changeSet, mergeManager, targetSession);
}
/**
* INTERNAL:
* Cascade perform delete through mappings that require the cascade
*/
@Override
public void cascadePerformRemoveIfRequired(Object object, UnitOfWorkImpl uow, Map visitedObjects){
Object cloneAttribute = null;
cloneAttribute = getAttributeValueFromObject(object);
if ( cloneAttribute == null ) {
return;
}
ContainerPolicy cp = getContainerPolicy();
Object cloneObjectCollection = null;
cloneObjectCollection = getRealCollectionAttributeValueFromObject(object, uow);
Object cloneIter = cp.iteratorFor(cloneObjectCollection);
while (cp.hasNext(cloneIter)) {
Object objectToCascadeOn = cp.next(cloneIter, uow);
if (objectToCascadeOn != null && (!visitedObjects.containsKey(objectToCascadeOn)) ) {
visitedObjects.put(objectToCascadeOn, objectToCascadeOn);
ObjectBuilder builder = getReferenceDescriptor(objectToCascadeOn.getClass(), uow).getObjectBuilder();
builder.cascadePerformRemove(objectToCascadeOn, uow, visitedObjects);
}
}
}
/**
* INTERNAL:
* Cascade discover and persist new objects during commit.
*/
@Override
public void cascadeDiscoverAndPersistUnregisteredNewObjects(Object object, Map newObjects, Map unregisteredExistingObjects, Map visitedObjects, UnitOfWorkImpl uow, Set cascadeErrors) {
Object cloneAttribute = getAttributeValueFromObject(object);
if (cloneAttribute == null ) {
return;
}
ContainerPolicy containerPolicy = getContainerPolicy();
Object cloneObjectCollection = getRealCollectionAttributeValueFromObject(object, uow);
Object iterator = containerPolicy.iteratorFor(cloneObjectCollection);
while (containerPolicy.hasNext(iterator)) {
Object nextObject = containerPolicy.next(iterator, uow);
if (nextObject != null) {
ObjectBuilder builder = getReferenceDescriptor(nextObject.getClass(), uow).getObjectBuilder();
builder.cascadeDiscoverAndPersistUnregisteredNewObjects(nextObject, newObjects, unregisteredExistingObjects, visitedObjects, uow, cascadeErrors);
}
}
}
/**
* INTERNAL:
* Cascade registerNew for Create through mappings that require the cascade
*/
@Override
public void cascadeRegisterNewIfRequired(Object object, UnitOfWorkImpl uow, Map 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.containsKey(nextObject)) ) {
visitedObjects.put(nextObject, nextObject);
builder = getReferenceDescriptor(nextObject.getClass(), uow).getObjectBuilder();
builder.cascadeRegisterNewForCreate(nextObject, uow, visitedObjects);
}
}
}
/**
* Return the fields handled by the mapping.
*/
@Override
protected Vector collectFields() {
Vector fields = new Vector(1);
fields.addElement(this.getField());
return fields;
}
/**
* INTERNAL:
* Compare the non-null elements and return true if they are alike.
*/
public boolean compareElements(Object element1, Object element2, AbstractSession session) {
if (element1.getClass() != element2.getClass()) {
return false;
}
return this.getObjectBuilder(element1, session).compareObjects(element1, element2, session);
}
/**
* INTERNAL:
* Compare the non-null elements and return true if they are alike.
*/
public boolean compareElementsForChange(Object element1, Object element2, AbstractSession session) {
return this.compareElements(element1, element2, 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.
* @param classLoader
*/
@Override
public void convertClassNamesToClasses(ClassLoader classLoader){
super.convertClassNamesToClasses(classLoader);
containerPolicy.convertClassNamesToClasses(classLoader);
}
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;
}
/**
* 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
protected void fixAttributeValue(Object attributeValue, Map objectDescriptors, Map processedObjects, ObjectLevelReadQuery query, DistributedSession session) {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.fixAttributeValue(cp.next(iter, session), objectDescriptors, processedObjects, query, session);
}
}
/**
* Return the appropriate attribute value.
* This method is a hack to allow the aggregate collection
* subclass to override....
* The intent is to return the aggregate object in the backup clone
* that corresponds to the one in the working copy.
* Since we don't know which element in the backup clone
* collection corresponds any given element in the working copy
* collection (there is no "primary key"); we simply return null,
* which will cause a new, empty, instance to be built and used
* for comparison.
*/
@Override
protected Object getAttributeValueFromBackupClone(Object backupClone) {
return null;
}
/**
* INTERNAL:
* Return the mapping's containerPolicy.
*/
@Override
public ContainerPolicy getContainerPolicy() {
return containerPolicy;
}
/**
* PUBLIC:
* Return the converter on the mapping.
* A converter can be used to convert between the object's value and database value of the attribute.
*/
public Converter getConverter() {
return converter;
}
/**
* INTERNAL:
* Return the field mapped by this mapping.
*/
@Override
public DatabaseField getField() {
return field;
}
/**
* INTERNAL:
* Convenience method.
* Return the value of an attribute, unwrapping value holders if necessary.
* If the value is null, build a new container.
*/
@Override
public Object getRealCollectionAttributeValueFromObject(Object object, AbstractSession session) throws DescriptorException {
Object value = this.getRealAttributeValueFromObject(object, session);
if (value == null) {
value = this.getContainerPolicy().containerInstance(1);
}
return value;
}
/**
* This is required for ObjectArrayMapping which defines a name for the collection type.
* Currently this type name is not required or used in general with the SDK.
*/
protected String getStructureName() {
return "";
}
/**
* PUBLIC:
* Indicates if there is a converter on the mapping.
*/
public boolean hasConverter() {
return getConverter() != null;
}
/**
* INTERNAL:
*/
@Override
public boolean isAbstractCompositeCollectionMapping() {
return true;
}
/**
* INTERNAL:
* The mapping is initialized with the given session. This mapping is fully initialized
* after this.
*/
@Override
public void initialize(AbstractSession session) throws DescriptorException {
super.initialize(session);
if (getField() == null) {
throw DescriptorException.fieldNameNotSetInMapping(this);
}
setField(getDescriptor().buildField(getField()));
setFields(collectFields());
if (hasConverter()) {
getConverter().initialize(this, session);
}
}
/**
* Iterate on the specified attribute value.
*/
@Override
protected void iterateOnAttributeValue(DescriptorIterator descriptorIterator, Object attributeValue) {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.iterateOnAttributeValue(descriptorIterator, cp.next(iter, descriptorIterator.getSession()));
}
}
/**
* INTERNAL:
* Return whether the element's user-defined Map key has changed
* since it was cloned from the original version.
* Aggregate elements cannot change their keys without detection.
*/
public boolean mapKeyHasChanged(Object element, AbstractSession session) {
return false;
}
/**
* The message is passed to its reference class descriptor.
*/
@Override
public void postDeleteAttributeValue(DeleteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.postDeleteAttributeValue(query, cp.next(iter, query.getSession()));
}
}
/**
* The message is passed to its reference class descriptor.
*/
@Override
public void postInsertAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.postInsertAttributeValue(query, cp.next(iter, query.getSession()));
}
}
/**
* The message is passed to its reference class descriptor.
*/
@Override
public void postUpdateAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.postUpdateAttributeValue(query, cp.next(iter, query.getSession()));
}
}
/**
* The message is passed to its reference class descriptor.
*/
@Override
public void preDeleteAttributeValue(DeleteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.preDeleteAttributeValue(query, cp.next(iter, query.getSession()));
}
}
/**
* The message is passed to its reference class descriptor.
*/
@Override
public void preInsertAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.preInsertAttributeValue(query, cp.next(iter, query.getSession()));
}
}
/**
* The message is passed to its reference class descriptor.
*/
@Override
public void preUpdateAttributeValue(WriteObjectQuery query, Object attributeValue) throws DatabaseException, OptimisticLockException {
if (attributeValue == null) {
return;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
super.preUpdateAttributeValue(query, cp.next(iter, query.getSession()));
}
}
/**
* ADVANCED:
* Set the mapping's containerPolicy.
*/
public void setContainerPolicy(ContainerPolicy containerPolicy) {
this.containerPolicy = containerPolicy;
}
/**
* PUBLIC:
* Set the converter on the mapping.
* A converter can be used to convert between the object's value and database value of the attribute.
*/
public void setConverter(Converter converter) {
this.converter = converter;
}
/**
* Set the field in the mapping.
*/
public void setField(DatabaseField field) {
this.field = field;
}
/**
* PUBLIC:
* Configure the mapping to use an instance of the specified container class
* to hold the target objects.
* jdk1.2.x: The container class must implement (directly or indirectly) the Collection interface.
*
jdk1.1.x: The container class must be a subclass of Vector.
*/
public void useCollectionClass(Class concreteContainerClass) {
this.setContainerPolicy(ContainerPolicy.buildPolicyFor(concreteContainerClass));
}
public void useCollectionClassName(String concreteContainerClassName) {
this.setContainerPolicy(new CollectionContainerPolicy(concreteContainerClassName));
}
public void useListClassName(String concreteContainerClassName) {
this.setContainerPolicy(new ListContainerPolicy(concreteContainerClassName));
}
/**
* PUBLIC:
* Configure the mapping to use an instance of the specified container class
* to hold the target objects. The key used to index the value in the Map
* is the value returned by a call to the specified zero-argument method.
* The method must be implemented by the class (or a superclass) of the
* value to be inserted into the Map.
*
jdk1.2.x: The container class must implement (directly or indirectly) the Map interface.
*
jdk1.1.x: The container class must be a subclass of Hashtable.
*
The referenceClass must be set before calling this method.
*/
public void useMapClass(Class concreteContainerClass, String methodName) {
// the reference class has to be specified before coming here
if (this.getReferenceClassName() == null) {
throw DescriptorException.referenceClassNotSpecified(this);
}
ContainerPolicy policy = ContainerPolicy.buildPolicyFor(concreteContainerClass);
policy.setKeyName(methodName, getReferenceClass());
this.setContainerPolicy(policy);
}
public void useMapClassName(String concreteContainerClassName, String methodName) {
// the reference class has to be specified before coming here
if (this.getReferenceClassName() == null) {
throw DescriptorException.referenceClassNotSpecified(this);
}
MapContainerPolicy policy = new MapContainerPolicy(concreteContainerClassName);
policy.setKeyName(methodName, getReferenceClass().getName());
this.setContainerPolicy(policy);
}
/**
* INTERNAL:
* Build and return an aggregate collection from the specified row.
*/
@Override
public Object valueFromRow(AbstractRecord row, JoinedAttributeManager joinManager, ObjectBuildingQuery sourceQuery, CacheKey cacheKey, AbstractSession executionSession, boolean isTargetProtected, Boolean[] wasCacheUsed) throws DatabaseException {
if (this.descriptor.getCachePolicy().isProtectedIsolation()){
if (this.isCacheable && isTargetProtected && cacheKey != null){
//cachekey will be null when isolating to uow
//used cached collection
Object result = null;
Object cached = cacheKey.getObject();
if (cached != null){
if (wasCacheUsed != null){
wasCacheUsed[0] = Boolean.TRUE;
}
Object attributeValue = this.getAttributeValueFromObject(cached);
Integer refreshCascade = null;
if (sourceQuery != null && sourceQuery.isObjectBuildingQuery() && sourceQuery.shouldRefreshIdentityMapResult()) {
refreshCascade = sourceQuery.getCascadePolicy();
}
return buildClonePart(cached, null, cacheKey, attributeValue, refreshCascade, executionSession);
}
return result;
}else if (!this.isCacheable && !isTargetProtected && cacheKey != null){
return null;
}
}
if (row.hasSopObject()) {
return getAttributeValueFromObject(row.getSopObject());
}
ContainerPolicy cp = this.getContainerPolicy();
Object fieldValue = row.getValues(this.getField());
// BUG#2667762 there could be whitespace in the row instead of null
if ((fieldValue == null) || (fieldValue instanceof String)) {
return cp.containerInstance();
}
Vector nestedRows = this.getReferenceDescriptor().buildNestedRowsFromFieldValue(fieldValue, executionSession);
if (nestedRows == null) {
return cp.containerInstance();
}
Object result = cp.containerInstance(nestedRows.size());
for (Enumeration stream = nestedRows.elements(); stream.hasMoreElements();) {
AbstractRecord nestedRow = (AbstractRecord)stream.nextElement();
ClassDescriptor descriptor = this.getReferenceDescriptor();
if (descriptor.hasInheritance()) {
Class newElementClass = descriptor.getInheritancePolicy().classFromRow(nestedRow, executionSession);
descriptor = this.getReferenceDescriptor(newElementClass, executionSession);
}
Object element = buildCompositeObject(descriptor, nestedRow, sourceQuery, cacheKey, joinManager, executionSession);
if (hasConverter()) {
element = getConverter().convertDataValueToObjectValue(element, executionSession);
}
cp.addInto(element, result, sourceQuery.getSession());
}
return result;
}
protected abstract Object buildCompositeObject(ClassDescriptor descriptor, AbstractRecord nestedRow, ObjectBuildingQuery query, CacheKey parentCacheKey, JoinedAttributeManager joinManger, AbstractSession targetSession);
/**
* Return whether the specified object and all its components have been deleted.
*/
@Override
protected boolean verifyDeleteOfAttributeValue(Object attributeValue, AbstractSession session) throws DatabaseException {
if (attributeValue == null) {
return true;
}
ContainerPolicy cp = this.getContainerPolicy();
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
if (!super.verifyDeleteOfAttributeValue(cp.next(iter, session), session)) {
return false;
}
}
return true;
}
/**
* INTERNAL:
* Get the attribute value from the object and add the appropriate
* values to the specified database row.
*/
@Override
public void writeFromObjectIntoRow(Object object, AbstractRecord row, AbstractSession session, WriteType writeType) throws DescriptorException {
if (this.isReadOnly()) {
return;
}
Object attributeValue = this.getAttributeValueFromObject(object);
if (attributeValue == null) {
row.put(this.getField(), null);
return;
}
ContainerPolicy cp = this.getContainerPolicy();
Vector nestedRows = new Vector(cp.sizeFor(attributeValue));
for (Object iter = cp.iteratorFor(attributeValue); cp.hasNext(iter);) {
Object element = cp.next(iter, session);
// convert the value - if necessary
if (hasConverter()) {
element = getConverter().convertObjectValueToDataValue(element, session);
}
nestedRows.addElement(buildCompositeRow(element, session, row, writeType));
}
Object fieldValue = null;
if (!nestedRows.isEmpty()) {
fieldValue = this.getReferenceDescriptor().buildFieldValueFromNestedRows(nestedRows, getStructureName(), session);
}
row.put(this.getField(), fieldValue);
}
protected abstract AbstractRecord buildCompositeRow(Object attributeValue, AbstractSession session, AbstractRecord record, WriteType writeType);
/**
* INTERNAL:
* Get the attribute value from the object and add the changed
* values to the specified database row.
*/
@Override
public void writeFromObjectIntoRowForUpdate(WriteObjectQuery writeQuery, AbstractRecord row) throws DescriptorException {
AbstractSession session = writeQuery.getSession();
//Helper.toDo("bjv: need to figure out how to handle read-only elements...");
if (session.isClassReadOnly(this.getReferenceClass())) {
return;
}
if (session.isUnitOfWork()) {
if (this.compareObjects(writeQuery.getObject(), writeQuery.getBackupClone(), session)) {
return;// nothing has changed - don't put anything in the row
}
}
this.writeFromObjectIntoRow(writeQuery.getObject(), row, session, WriteType.UPDATE);
}
/**
* INTERNAL:
* Get the attribute value from the object and add the appropriate
* values to the specified database row.
*/
@Override
public void writeFromObjectIntoRowWithChangeRecord(ChangeRecord changeRecord, AbstractRecord row, AbstractSession session, WriteType writeType) throws DescriptorException {
Object object = ((ObjectChangeSet)changeRecord.getOwner()).getUnitOfWorkClone();
this.writeFromObjectIntoRow(object, row, session, writeType);
}
/**
* INTERNAL:
* Write fields needed for insert into the template with null values.
*/
@Override
public void writeInsertFieldsIntoRow(AbstractRecord record, AbstractSession session) {
if (this.isReadOnly()) {
return;
}
record.put(this.getField(), null);
}
@Override
public boolean isCollectionMapping() {
return true;
}
/**
* INTERNAL:
* Build and return the change record that results
* from comparing the two direct collection attributes.
*/
public ChangeRecord compareForChange(Object clone, Object backup, ObjectChangeSet owner, AbstractSession session) {
return (new ArrayCollectionMappingHelper(this)).compareForChange(clone, backup, owner, session);
}
/**
* INTERNAL:
* Compare the attributes belonging to this mapping for the objects.
*/
public boolean compareObjects(Object object1, Object object2, AbstractSession session) {
return (new ArrayCollectionMappingHelper(this)).compareObjects(object1, object2, session);
}
/**
* INTERNAL:
* Merge changes from the source to the target object.
*/
public void mergeChangesIntoObject(Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager, AbstractSession targetSession) {
(new ArrayCollectionMappingHelper(this)).mergeChangesIntoObject(target, changeRecord, source, mergeManager, targetSession);
}
/**
* INTERNAL:
* Merge changes from the source to the target object.
* Simply replace the entire target collection.
*/
public void mergeIntoObject(Object target, boolean isTargetUnInitialized, Object source, MergeManager mergeManager, AbstractSession targetSession) {
(new ArrayCollectionMappingHelper(this)).mergeIntoObject(target, isTargetUnInitialized, source, mergeManager, targetSession);
}
/**
* 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.
*/
public void simpleAddToCollectionChangeRecord(Object referenceKey, Object changeSetToAdd, ObjectChangeSet changeSet, AbstractSession session) {
(new ArrayCollectionMappingHelper(this)).simpleAddToCollectionChangeRecord(referenceKey, changeSetToAdd, changeSet, session);
}
/**
* 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.
*/
public void simpleRemoveFromCollectionChangeRecord(Object referenceKey, Object changeSetToRemove, ObjectChangeSet changeSet, AbstractSession session) {
(new ArrayCollectionMappingHelper(this)).simpleRemoveFromCollectionChangeRecord(referenceKey, changeSetToRemove, changeSet, session);
}
/**
* INTERNAL
* Called when a DatabaseMapping is used to map the key in a collection. Returns the key.
*/
public Object createMapComponentFromRow(AbstractRecord dbRow, ObjectBuildingQuery query, CacheKey parentCacheKey, AbstractSession session, boolean isTargetProtected){
return valueFromRow(dbRow, null, query, parentCacheKey, query.getExecutionSession(), isTargetProtected, null);
}
}