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); }
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); }
public virtual ITypeHandler4 ReadCandidateHandler(QueryingReadContext context) { int payLoadOffSet = context.ReadInt(); if (payLoadOffSet == 0) { return(null); } context.Seek(payLoadOffSet); int classMetadataID = context.ReadInt(); ClassMetadata classMetadata = context.Container().ClassMetadataForID(classMetadataID ); if (classMetadata == null) { return(null); } return(classMetadata.ReadCandidateHandler(context)); }
/// <exception cref="Db4objects.Db4o.Ext.Db4oIOException"></exception> private void CollectIDsByInstantiatingCollection(QueryingReadContext context) { int id = context.CollectionID(); if (id == 0) { return; } Transaction transaction = context.Transaction(); ObjectContainerBase container = context.Container(); object obj = container.GetByID(transaction, id); if (obj == null) { return; } // FIXME: [TA] review activation depth int depth = DepthUtil.AdjustDepthToBorders(2); container.Activate(transaction, obj, container.ActivationDepthProvider().ActivationDepth (depth, ActivationMode.Activate)); Platform4.ForEachCollectionElement(obj, new _IVisitor4_390(context)); }