/// <param name="subnodeBTree">Note: We use ref, this way we are able to create a new subnode BTree and update the subnodeBTree the caller provided</param> /// <param name="heapOrNodeID">Existing HeapOrNodeID</param> public static HeapOrNodeID StoreExternalProperty(PSTFile file, HeapOnNode heap, ref SubnodeBTree subnodeBTree, HeapOrNodeID heapOrNodeID, byte[] propertyBytes) { // We should avoid storing items with length of 0, because those are consideref freed, and could be repurposed if (propertyBytes.Length == 0) { RemoveExternalProperty(heap, subnodeBTree, heapOrNodeID); return(new HeapOrNodeID(HeapID.EmptyHeapID)); } if (heapOrNodeID.IsHeapID) // if HeapOrNodeID is empty then IsHeapID == true { if (propertyBytes.Length <= HeapOnNode.MaximumAllocationLength) { if (heapOrNodeID.IsEmpty) { return(new HeapOrNodeID(heap.AddItemToHeap(propertyBytes))); } else { return(new HeapOrNodeID(heap.ReplaceHeapItem(heapOrNodeID.HeapID, propertyBytes))); } } else // old data (if exist) is stored on heap, but new data needs a subnode { if (!heapOrNodeID.IsEmpty) { heap.RemoveItemFromHeap(heapOrNodeID.HeapID); } if (subnodeBTree == null) { subnodeBTree = new SubnodeBTree(file); } DataTree dataTree = new DataTree(file); dataTree.AppendData(propertyBytes); dataTree.SaveChanges(); NodeID subnodeID = file.Header.AllocateNextNodeID(NodeTypeName.NID_TYPE_LTP); subnodeBTree.InsertSubnodeEntry(subnodeID, dataTree, null); return(new HeapOrNodeID(subnodeID)); } } else // old data is stored in a subnode { Subnode subnode = subnodeBTree.GetSubnode(heapOrNodeID.NodeID); if (subnode.DataTree != null) { subnode.DataTree.Delete(); } subnode.DataTree = new DataTree(subnodeBTree.File); subnode.DataTree.AppendData(propertyBytes); subnode.SaveChanges(subnodeBTree); return(new HeapOrNodeID(heapOrNodeID.NodeID)); } }
/// <summary> /// The caller must update its reference to point to the new data tree and subnode B-tree /// </summary> public void SaveChanges() { if (m_subnodeRows != null) { m_subnodeRows.SaveChanges(); m_subnodeBTree.UpdateSubnodeEntry(m_tcInfo.hnidRows.NodeID, m_subnodeRows.DataTree, m_subnodeRows.SubnodeBTree); } m_heap.SaveChanges(); if (m_subnodeBTree != null) { m_subnodeBTree.SaveChanges(); } }