/**
* Build and return the change record that results from comparing the two collection attributes.
* The order of the elements is significant.
*/
private ChangeRecord compareAttributeValuesForChangeWithOrder(
Object cloneCollection,
Object backupCollection,
ObjectChangeSet owner,
AbstractSession session) {
ContainerPolicy cp = this.getContainerPolicy();
Vector cloneVector =
cp.vectorFor(
cloneCollection,
session); // convert it to a Vector so we can preserve the order and use indexes
Vector backupVector =
cp.vectorFor(backupCollection, session); // "clone" it so we can clear out the slots
EISOrderedCollectionChangeRecord changeRecord =
new EISOrderedCollectionChangeRecord(
owner, this.getAttributeName(), this.getDatabaseMapping());
for (int i = 0; i < cloneVector.size(); i++) {
Object cloneElement = cloneVector.elementAt(i);
boolean found = false;
for (int j = 0; j < backupVector.size(); j++) {
if (this.compareElementsForChange(cloneElement, backupVector.elementAt(j), session)) {
// the clone element was found in the backup collection
found = true;
backupVector.setElementAt(XXX, j); // clear out the matching backup element
changeRecord.addMovedChangeSet(this.buildChangeSet(cloneElement, owner, session), j, i);
break; // matching backup element found - skip the rest of them
}
}
if (!found) {
// the clone element was not found, so it must have been added
changeRecord.addAddedChangeSet(this.buildChangeSet(cloneElement, owner, session), i);
}
}
for (int i = 0; i < backupVector.size(); i++) {
Object backupElement = backupVector.elementAt(i);
if (backupElement != XXX) {
// the backup element was not in the clone collection, so it must have been removed
changeRecord.addRemovedChangeSet(this.buildChangeSet(backupElement, owner, session), i);
}
}
if (changeRecord.hasChanges()) {
return changeRecord;
} else {
return null;
}
}
/**
* Build and return the change record that results from comparing the two collection attributes.
* Ignore the order of the elements.
*/
private ChangeRecord compareAttributeValuesForChangeWithoutOrder(
Object cloneCollection,
Object backupCollection,
ObjectChangeSet owner,
AbstractSession session) {
ContainerPolicy cp = this.getContainerPolicy();
Vector backupVector =
cp.vectorFor(backupCollection, session); // "clone" it so we can clear out the slots
EISCollectionChangeRecord changeRecord =
new EISCollectionChangeRecord(owner, this.getAttributeName(), this.getDatabaseMapping());
for (Object cloneIter = cp.iteratorFor(cloneCollection); cp.hasNext(cloneIter); ) {
Object cloneElement = cp.next(cloneIter, session);
boolean found = false;
for (int i = 0; i < backupVector.size(); i++) {
if (this.compareElementsForChange(cloneElement, backupVector.elementAt(i), session)) {
// the clone element was found in the backup collection
found = true;
backupVector.setElementAt(XXX, i); // clear out the matching backup element
if (this.mapKeyHasChanged(cloneElement, session)) {
changeRecord.addChangedMapKeyChangeSet(
this.buildChangeSet(cloneElement, owner, session));
}
break; // matching backup element found - skip the rest of them
}
}
if (!found) {
// the clone element was not found, so it must have been added
changeRecord.addAddedChangeSet(this.buildChangeSet(cloneElement, owner, session));
}
}
for (int i = 0; i < backupVector.size(); i++) {
Object backupElement = backupVector.elementAt(i);
if (backupElement != XXX) {
// the backup element was not in the clone collection, so it must have been removed
changeRecord.addRemovedChangeSet(this.buildChangeSet(backupElement, owner, session));
}
}
if (changeRecord.hasChanges()) {
return changeRecord;
} else {
return null;
}
}
/**
* INTERNAL: This method is used when computing the nested queries for batch read mappings. It
* recurses computing the nested mapping queries.
*/
protected void computeNestedQueriesForBatchReadExpressions(Vector batchReadExpressions) {
for (int index = 0; index < batchReadExpressions.size(); index++) {
ObjectExpression objectExpression = (ObjectExpression) batchReadExpressions.get(index);
// Expression may not have been initialized.
ExpressionBuilder builder = objectExpression.getBuilder();
builder.setSession(getSession().getRootSession(null));
builder.setQueryClass(getReferenceClass());
// PERF: Cache join attribute names.
ObjectExpression baseExpression = objectExpression;
while (!baseExpression.getBaseExpression().isExpressionBuilder()) {
baseExpression = (ObjectExpression) baseExpression.getBaseExpression();
}
this.batchReadAttributes.add(baseExpression.getName());
// Ignore nested
if (objectExpression.getBaseExpression().isExpressionBuilder()) {
DatabaseMapping mapping = objectExpression.getMapping();
if ((mapping != null) && mapping.isForeignReferenceMapping()) {
// A nested query must be built to pass to the descriptor that looks like the real query
// execution would.
ReadQuery nestedQuery = ((ForeignReferenceMapping) mapping).prepareNestedBatchQuery(this);
// Register the nested query to be used by the mapping for all the objects.
getBatchReadMappingQueries().put(mapping, nestedQuery);
}
}
}
}
/** Compare the attributes. Return true if they are alike. Ignore the order of the elements. */
private boolean compareAttributeValuesWithoutOrder(
Object collection1, Object collection2, AbstractSession session) {
ContainerPolicy cp = this.getContainerPolicy();
Vector vector2 = cp.vectorFor(collection2, session); // "clone" it so we can clear out the slots
for (Object iter1 = cp.iteratorFor(collection1); cp.hasNext(iter1); ) {
Object element1 = cp.next(iter1, session);
boolean found = false;
for (int i = 0; i < vector2.size(); i++) {
if (this.compareElements(element1, vector2.elementAt(i), session)) {
found = true;
vector2.setElementAt(XXX, i); // clear out the matching element
break; // matching element found - skip the rest of them
}
}
if (!found) {
return false;
}
}
// look for elements that were not in collection1
for (Enumeration stream = vector2.elements(); stream.hasMoreElements(); ) {
if (stream.nextElement() != XXX) {
return false;
}
}
return true;
}
/** INTERNAL: Return if the attribute is specified for batch reading. */
public boolean isAttributeBatchRead(String attributeName) {
if (!hasBatchReadAttributes()) {
return false;
}
Vector batchReadAttributeExpressions = getBatchReadAttributeExpressions();
int size = batchReadAttributeExpressions.size();
for (int index = 0; index < size; index++) {
QueryKeyExpression expression = (QueryKeyExpression) batchReadAttributeExpressions.get(index);
while (!expression.getBaseExpression().isExpressionBuilder()) {
expression = (QueryKeyExpression) expression.getBaseExpression();
}
if (expression.getName().equals(attributeName)) {
return true;
}
}
return false;
}
/**
* Merge changes from the source to the target object. Simply replace the entire target
* collection.
*/
private void mergeChangesIntoObjectWithOrder(
Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager) {
ContainerPolicy cp = this.getContainerPolicy();
AbstractSession session = mergeManager.getSession();
Vector changes = ((EISOrderedCollectionChangeRecord) changeRecord).getNewCollection();
Object targetCollection = cp.containerInstance(changes.size());
for (Enumeration stream = changes.elements(); stream.hasMoreElements(); ) {
Object targetElement =
this.buildAddedElementFromChangeSet(stream.nextElement(), mergeManager);
cp.addInto(targetElement, targetCollection, session);
}
// reset the attribute to allow for set method to re-morph changes if the collection is not
// being stored directly
this.setRealAttributeValueInObject(target, targetCollection);
}
/**
* INTERNAL: The results are *not* in a cursor, build the collection. Cache the results in
* temporaryCachedQueryResults.
*/
protected Object executeNonCursor() throws DatabaseException {
Vector rows = getQueryMechanism().executeSelect();
Object results = null;
if (this.resultType == MAP) {
results = getContainerPolicy().buildContainerFromVector(rows, this.session);
} else if (this.resultType == VALUE) {
if (!rows.isEmpty()) {
AbstractRecord record = (AbstractRecord) rows.get(0);
// Use get with field for XML records.
results = record.get(record.getFields().get(0));
if (getValueConverter() != null) {
results = getValueConverter().convertDataValueToObjectValue(results, this.session);
}
}
} else {
int size = rows.size();
ContainerPolicy containerPolicy = getContainerPolicy();
results = containerPolicy.containerInstance(size);
if (containerPolicy.shouldAddAll()) {
if (size > 0) {
List values = new ArrayList(size);
for (int index = 0; index < size; index++) {
AbstractRecord row = (AbstractRecord) rows.get(index);
Object value = buildObject(row);
values.add(value);
}
containerPolicy.addAll(values, results, this.session, rows, this);
}
} else {
for (int index = 0; index < size; index++) {
AbstractRecord row = (AbstractRecord) rows.get(index);
Object value = buildObject(row);
containerPolicy.addInto(value, results, this.session, row, this);
}
}
}
// Bug 6135563 - cache DataReadQuery results verbatim, as ObjectBuilder is not invoked
cacheResult(results);
return results;
}
/** INTERNAL: Conform the result if specified. */
protected Object conformResult(
Object result,
UnitOfWorkImpl unitOfWork,
AbstractRecord arguments,
boolean buildDirectlyFromRows) {
if (getSelectionCriteria() != null) {
ExpressionBuilder builder = getSelectionCriteria().getBuilder();
builder.setSession(unitOfWork.getRootSession(null));
builder.setQueryClass(getReferenceClass());
}
// If the query is redirected then the collection returned might no longer
// correspond to the original container policy. CR#2342-S.M.
ContainerPolicy cp;
if (getRedirector() != null) {
cp = ContainerPolicy.buildPolicyFor(result.getClass());
} else {
cp = getContainerPolicy();
}
// This code is now a great deal different... For one, registration is done
// as part of conforming. Also, this should only be called if one actually
// is conforming.
// First scan the UnitOfWork for conforming instances.
// This will walk through the entire cache of registered objects.
// Let p be objects from result not in the cache.
// Let c be objects from cache.
// Presently p intersect c = empty set, but later p subset c.
// By checking cache now doesConform will be called p fewer times.
Map indexedInterimResult =
unitOfWork.scanForConformingInstances(
getSelectionCriteria(), getReferenceClass(), arguments, this);
Cursor cursor = null;
// In the case of cursors just conform/register the initially read collection.
if (cp.isCursorPolicy()) {
cursor = (Cursor) result;
cp = ContainerPolicy.buildPolicyFor(ClassConstants.Vector_class);
// In nested UnitOfWork session might have been session of the parent.
cursor.setSession(unitOfWork);
result = cursor.getObjectCollection();
// for later incremental conforming...
cursor.setInitiallyConformingIndex(indexedInterimResult);
cursor.setSelectionCriteriaClone(getSelectionCriteria());
cursor.setTranslationRow(arguments);
}
// Now conform the result from the database.
// Remove any deleted or changed objects that no longer conform.
// Deletes will only work for simple queries, queries with or's or anyof's may not return
// correct results when untriggered indirection is in the model.
Vector fromDatabase = null;
// When building directly from rows, one of the performance benefits
// is that we no longer have to wrap and then unwrap the originals.
// result is just a vector, not a container of wrapped originals.
if (buildDirectlyFromRows) {
Vector rows = (Vector) result;
fromDatabase = new Vector(rows.size());
for (int i = 0; i < rows.size(); i++) {
Object object = rows.elementAt(i);
// null is placed in the row collection for 1-m joining to filter duplicate rows.
if (object != null) {
Object clone =
conformIndividualResult(
object,
unitOfWork,
arguments,
getSelectionCriteria(),
indexedInterimResult,
buildDirectlyFromRows);
if (clone != null) {
fromDatabase.addElement(clone);
}
}
}
} else {
fromDatabase = new Vector(cp.sizeFor(result));
AbstractSession sessionToUse = unitOfWork.getParent();
for (Object iter = cp.iteratorFor(result); cp.hasNext(iter); ) {
Object object = cp.next(iter, sessionToUse);
Object clone =
conformIndividualResult(
object,
unitOfWork,
arguments,
getSelectionCriteria(),
indexedInterimResult,
buildDirectlyFromRows);
if (clone != null) {
fromDatabase.addElement(clone);
}
}
}
// Now add the unwrapped conforming instances into an appropriate container.
// Wrapping is done automatically.
// Make sure a vector of exactly the right size is returned.
Object conformedResult =
cp.containerInstance(indexedInterimResult.size() + fromDatabase.size());
Object eachClone;
for (Iterator enumtr = indexedInterimResult.values().iterator(); enumtr.hasNext(); ) {
eachClone = enumtr.next();
cp.addInto(eachClone, conformedResult, unitOfWork);
}
for (Enumeration enumtr = fromDatabase.elements(); enumtr.hasMoreElements(); ) {
eachClone = enumtr.nextElement();
cp.addInto(eachClone, conformedResult, unitOfWork);
}
if (cursor != null) {
cursor.setObjectCollection((Vector) conformedResult);
// For nested UOW must copy all in object collection to
// initiallyConformingIndex, as some of these could have been from
// the parent UnitOfWork.
if (unitOfWork.isNestedUnitOfWork()) {
for (Enumeration enumtr = cursor.getObjectCollection().elements();
enumtr.hasMoreElements(); ) {
Object clone = enumtr.nextElement();
indexedInterimResult.put(clone, clone);
}
}
return cursor;
} else {
return conformedResult;
}
}