public override ITypeHandler4 ReadCandidateHandler(QueryingReadContext context)
{
int id = 0;
int offset = context.Offset();
try
{
id = context.ReadInt();
}
catch (Exception)
{
}
context.Seek(offset);
if (id != 0)
{
StatefulBuffer reader = context.Container().ReadStatefulBufferById(context.Transaction
(), id);
if (reader != null)
{
ObjectHeader oh = new ObjectHeader(context.Container(), reader);
try
{
if (oh.ClassMetadata() != null)
{
context.Buffer(reader);
return oh.ClassMetadata().SeekCandidateHandler(context);
}
}
catch (Exception e)
{
}
}
}
// TODO: Check Exception Types
// Errors typically occur, if classes don't match
return null;
}
// throw new IllegalStateException();
public virtual void CollectIDs(QueryingReadContext readContext)
{
IInternalReadContext context = (IInternalReadContext)readContext;
int payloadOffset = context.ReadInt();
if (payloadOffset == 0)
{
return;
}
int savedOffSet = context.Offset();
try
{
ITypeHandler4 typeHandler = ReadTypeHandler(context, payloadOffset);
if (typeHandler == null)
{
return;
}
SeekSecondaryOffset(context, typeHandler);
if (IsPlainObject(typeHandler))
{
readContext.Collector().AddId(readContext.ReadInt());
return;
}
CollectIdContext collectIdContext = new _CollectIdContext_203(readContext, readContext
.Transaction(), readContext.Collector(), null, readContext.Buffer());
Handlers4.CollectIdsInternal(collectIdContext, context.Container().Handlers.CorrectHandlerVersion
(typeHandler, context.HandlerVersion()), 0, false);
}
finally
{
context.Seek(savedOffSet);
}
}
public QCandidate ReadSubCandidate(QueryingReadContext context, ITypeHandler4 handler
)
{
ObjectID objectID = ObjectID.NotPossible;
try
{
int offset = context.Offset();
if (handler is IReadsObjectIds)
{
objectID = ((IReadsObjectIds)handler).ReadObjectID(context);
}
if (objectID.IsValid())
{
return new QCandidate(this, null, objectID._id);
}
if (objectID == ObjectID.NotPossible)
{
context.Seek(offset);
object obj = context.Read(handler);
if (obj != null)
{
QCandidate candidate = new QCandidate(this, obj, context.Container().GetID(context
.Transaction(), obj));
candidate.ClassMetadata(context.Container().ClassMetadataForObject(obj));
return candidate;
}
}
}
catch (Exception)
{
}
// FIXME: Catchall
return null;
}
/// <exception cref="Db4objects.Db4o.Ext.Db4oIOException"></exception>
private void CollectIDsByInstantiatingCollection(QueryingReadContext context)
{
var id = context.CollectionID();
if (id == 0)
{
return;
}
var transaction = context.Transaction();
var container = context.Container();
var obj = container.GetByID(transaction, id);
if (obj == null)
{
return;
}
// FIXME: [TA] review activation depth
var depth = DepthUtil.AdjustDepthToBorders(2);
container.Activate(transaction, obj, container.ActivationDepthProvider().ActivationDepth
(depth, ActivationMode.Activate));
Platform4.ForEachCollectionElement(obj, new _IVisitor4_390(context));
}
/// <exception cref="Db4objects.Db4o.Ext.Db4oIOException"></exception>
private bool CollectIDsByTypehandlerAspect(QueryingReadContext context)
{
var aspectFound = new BooleanByRef(false);
var subContext = CollectIdContext.ForID(context.Transaction(), context
.Collector(), context.CollectionID());
ITraverseAspectCommand command = new _MarshallingInfoTraverseAspectCommand_349(this
, aspectFound, subContext, EnsureFieldList(subContext));
TraverseAllAspects(subContext, command);
return aspectFound.value;
}
// TODO Auto-generated method stub
public virtual void CollectIDs(QueryingReadContext context)
{
int id = context.ReadInt();
BTree bTree = NewBTree(context, id);
bTree.TraverseKeys(context.Transaction(), new _IVisitor4_83(context));
}