/**
* INTERNAL: Lazy initialization of xmlTypeFactory allows to avoid loading xdb-dependent class
* XMLTypeFactoryImpl unless xdb is used.
*
* @return XMLTypeFactory
*/
protected XMLTypeFactory getXMLTypeFactory() {
if (xmlTypeFactory == null) {
String className = "oracle.toplink.internal.platform.database.oracle.xdb.XMLTypeFactoryImpl";
try {
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()) {
Class xmlTypeFactoryClass =
(Class)
AccessController.doPrivileged(
new PrivilegedClassForName(
className, true, this.getClass().getClassLoader()));
Constructor xmlTypeFactoryConstructor =
(Constructor)
AccessController.doPrivileged(
new PrivilegedGetConstructorFor(xmlTypeFactoryClass, new Class[0], true));
xmlTypeFactory =
(XMLTypeFactory)
AccessController.doPrivileged(
new PrivilegedInvokeConstructor(xmlTypeFactoryConstructor, new Object[0]));
} else {
Class xmlTypeFactoryClass =
PrivilegedAccessHelper.getClassForName(
className, true, this.getClass().getClassLoader());
Constructor xmlTypeFactoryConstructor =
PrivilegedAccessHelper.getConstructorFor(xmlTypeFactoryClass, new Class[0], true);
xmlTypeFactory =
(XMLTypeFactory)
PrivilegedAccessHelper.invokeConstructor(
xmlTypeFactoryConstructor, new Object[0]);
}
} catch (Exception e) {
throw QueryException.reflectiveCallOnTopLinkClassFailed(className, e);
}
}
return xmlTypeFactory;
}
/**
* INTERNAL: Invalid the cache, that is, those objects in the cache that were affected by the
* query.
*/
protected void invalidateCache() {
oracle.toplink.sessions.IdentityMapAccessor identityMapAccessor =
getSession().getIdentityMapAccessor();
if (getSelectionCriteria() == null) {
// Invalidate the whole class since the user did not specify a where clause
if (getDescriptor().isChildDescriptor()) {
Vector collectionToInvalidate =
identityMapAccessor.getAllFromIdentityMap(
null, getReferenceClass(), getTranslationRow(), null);
identityMapAccessor.invalidateObjects(collectionToInvalidate);
} else {
// if it's either a root class or there is no inheritance just clear the identity map
identityMapAccessor.invalidateClass(getReferenceClass());
}
} else {
// Invalidate only those objects in the cache that match the selection criteria
// Bug:4293920, expression parameters were not passed in
boolean noObjectsModifiedInDb = result != null && result.intValue() == 0;
try {
int policy = InMemoryQueryIndirectionPolicy.SHOULD_IGNORE_EXCEPTION_RETURN_CONFORMED;
if (noObjectsModifiedInDb) {
policy = InMemoryQueryIndirectionPolicy.SHOULD_IGNORE_EXCEPTION_RETURN_NOT_CONFORMED;
}
Vector collectionToInvalidate =
identityMapAccessor.getAllFromIdentityMap(
getSelectionCriteria(), getReferenceClass(), getTranslationRow(), policy);
identityMapAccessor.invalidateObjects(collectionToInvalidate);
} catch (QueryException ex) {
if (ex.getErrorCode() == QueryException.CANNOT_CONFORM_EXPRESSION) {
// If no objects changed in the db - don't invalidate, ignore.
if (!noObjectsModifiedInDb) {
// Invalidate the whole class since the expression can't be selected in memory
identityMapAccessor.invalidateClass(getReferenceClass());
}
} else {
throw ex;
}
}
}
}
/**
* INTERNAL: Execute the query. If there are cached results return those. This must override the
* super to support result caching.
*
* @param aSession - the session in which the receiver will be executed.
* @return An object or vector, the result of executing the query.
* @exception DatabaseException - an error has occurred on the database
*/
public Object execute(AbstractSession session, AbstractRecord row) throws DatabaseException {
if (shouldCacheQueryResults()) {
if (getContainerPolicy().overridesRead()) {
throw QueryException.cannotCacheCursorResultsOnQuery(this);
}
if (isPrepared()) { // only prepared queries can have cached results.
Object results = getQueryResults(session, row, true);
// Bug6138532 - if results are "cached no results", return null immediately
if (results == InvalidObject.instance) {
return null;
}
if (results != null) {
return results;
}
}
}
return super.execute(session, row);
}
