{
if (log.isDebugEnabled()) log.debug("getCollectionByQuery (" + collectionClass + ", " + itemClass + ", " + query + ")");
ClassDescriptor cld = pb.getClassDescriptor(itemClass);
ManageableCollection result = null;
OJBIterator iter = null;
int fullSize = -1;
int size = 0;
final boolean isRetrievalTasksCreated = batchRetrieval && m_retrievalTasks == null;
if (isRetrievalTasksCreated)
{
// Maps ReferenceDescriptors to HashSets of owners
m_retrievalTasks = new HashMap();
}
// ==> enable materialization cache
pb.getInternalCache().enableMaterializationCache();
try
{
result = (ManageableCollection) collectionClass.newInstance();
// now iterate over all elements and add them to the new collection
// lifecycle events are disabled
iter = pb.getIteratorFromQuery(query, cld);
iter.disableLifeCycleEvents();
// BRJ : get fullSizefor Query
// to be removed when Query.fullSize is removed
if (iter instanceof PagingIterator)
{
fullSize = iter.fullSize();
}
while (iter.hasNext())
{
Object candidate = iter.next();
/**
* MBAIRD
* candidate CAN be null in the case of materializing from an iterator based
* on a query for a class that is mapped to a table that has other classes
* mapped to that table as well, but aren't extents.
*/
if (candidate != null)
{
IndirectionHandler handler = ProxyHelper.getIndirectionHandler(candidate);
if ((handler != null) || itemClass.isAssignableFrom(candidate.getClass()))
{
result.ojbAdd(candidate);
// BRJ: count added objects
// to be removed when Query.fullSize is removed
size++;
}
else
{
//warn the user
log.warn("Candidate object ["+candidate
+"] class ["+candidate.getClass().getName()
+"] is not a subtype of ["+itemClass.getName()
+"] or any type of proxy. NOT INCLUDED in result collection");
}
if (prefetchProxies && (handler != null)
&& (cld.getProxyPrefetchingLimit() > 0)
&& addRetrievalTask(candidate, this))
{
new PBMaterializationListener(candidate, m_retrievalTasks,
this, cld.getProxyPrefetchingLimit());
}
}
}
if (isRetrievalTasksCreated)
{
// turn off auto prefetching for related proxies
final Class saveClassToPrefetch = classToPrefetch;
classToPrefetch = null;
try
{
performRetrievalTasks();
}
finally
{
classToPrefetch = saveClassToPrefetch;
}
}
// BRJ: fire LifeCycleEvents after execution of RetrievalTasks
// to ensure objects are fully materialized
Iterator resultIter = result.ojbIterator();
while (resultIter.hasNext())
{
Object obj = resultIter.next();
afterLookupEvent.setTarget(obj);
pb.fireBrokerEvent(afterLookupEvent);
afterLookupEvent.setTarget(null);
}
// ==> disable materialization cache
pb.getInternalCache().disableMaterializationCache();
}
catch(RuntimeException e)
{
// ==> clear materialization cache
pb.getInternalCache().doLocalClear();
throw e;
}
catch (Exception ex)
{
// ==> clear materialization cache
pb.getInternalCache().doLocalClear();
log.error(ex);
throw new PersistenceBrokerException(ex);
}
finally
{
if (iter != null)
{
iter.releaseDbResources();
}
if (isRetrievalTasksCreated)
{
m_retrievalTasks = null;
}