C# NeoDatis.GetPreviousObjectOID方法代码示例

//.........这里部分代码省略.........
				NeoDatis.Tool.DLogger.Debug(DepthToSpaces() + "Start Writing non native object of type "
					 + objectInfo.GetClassInfo().GetFullClassName() + " at " + position + " , oid = "
					 + oid + " : " + objectInfo.ToString());
			}
			if (objectInfo.GetClassInfo() == null || objectInfo.GetClassInfo().GetId() == null)
			{
				if (objectInfo.GetClassInfo() != null)
				{
					NeoDatis.Odb.Core.Layers.Layer2.Meta.ClassInfo clinfo = storageEngine.GetSession(
						true).GetMetaModel().GetClassInfo(objectInfo.GetClassInfo().GetFullClassName(), 
						true);
					objectInfo.SetClassInfo(clinfo);
				}
				else
				{
					throw new NeoDatis.Odb.ODBRuntimeException(NeoDatis.Odb.Core.NeoDatisError.UndefinedClassInfo
						.AddParameter(objectInfo.ToString()));
				}
			}
			// updates the meta model - If class already exist, it returns the
			// metamodel class, which contains
			// a bit more informations
			NeoDatis.Odb.Core.Layers.Layer2.Meta.ClassInfo classInfo = AddClass(objectInfo.GetClassInfo
				(), true);
			objectInfo.SetClassInfo(classInfo);
			// 
			if (isNewObject)
			{
				ManageNewObjectPointers(objectInfo, classInfo, position, metaModel);
			}
			if (NeoDatis.Odb.OdbConfiguration.SaveHistory())
			{
				classInfo.AddHistory(new NeoDatis.Odb.Impl.Core.Layers.Layer2.Meta.History.InsertHistoryInfo
					("insert", oid, position, objectInfo.GetPreviousObjectOID(), objectInfo.GetNextObjectOID
					()));
			}
			fsi.SetWritePosition(position, writeDataInTransaction);
			objectInfo.SetPosition(position);
			int nbAttributes = objectInfo.GetClassInfo().GetAttributes().Count;
			// compute the size of the array of byte needed till the attibute
			// positions
			// BlockSize + Block Type + ObjectId + ClassInfoId + Previous + Next +
			// CreatDate + UpdateDate + VersionNumber + ObjectRef + isSync + NbAttri
			// + Attributes
			// Int + Int + Long + Long + Long + Long + Long + Long + int + Long +
			// Bool + int + variable
			// 7 Longs + 4Ints + 1Bool + variable
			int tsize = 7 * NeoDatis.Odb.Core.Layers.Layer2.Meta.ODBType.SizeOfLong + 3 * NeoDatis.Odb.Core.Layers.Layer2.Meta.ODBType
				.SizeOfInt + 2 * NeoDatis.Odb.Core.Layers.Layer2.Meta.ODBType.SizeOfByte;
			byte[] bytes = new byte[tsize];
			// Block size
			byteArrayConverter.IntToByteArray(0, bytes, 0);
			// Block type
			bytes[4] = NeoDatis.Odb.Impl.Core.Layers.Layer3.Block.BlockTypes.BlockTypeNonNativeObject;
			// fsi.writeInt(BlockTypes.BLOCK_TYPE_NON_NATIVE_OBJECT,
			// writeDataInTransaction, "block size");
			// The object id
			EncodeOid(oid, bytes, 5);
			// fsi.writeLong(oid.getObjectId(), writeDataInTransaction, "oid",
			// DefaultWriteAction.DATA_WRITE_ACTION);
			// Class info id
			byteArrayConverter.LongToByteArray(classInfo.GetId().GetObjectId(), bytes, 13);
			// fsi.writeLong(classInfo.getId().getObjectId(),
			// writeDataInTransaction, "class info id",
			// DefaultWriteAction.DATA_WRITE_ACTION);
			// previous instance

		public virtual NeoDatis.Odb.OID Delete(NeoDatis.Odb.Core.Layers.Layer2.Meta.ObjectInfoHeader
			 header)
		{
			NeoDatis.Odb.Core.Transaction.ISession lsession = GetSession();
			NeoDatis.Odb.Core.Transaction.ICache cache = lsession.GetCache();
			long objectPosition = header.GetPosition();
			NeoDatis.Odb.OID classInfoId = header.GetClassInfoId();
			NeoDatis.Odb.OID oid = header.GetOid();
			// gets class info from in memory meta model
			NeoDatis.Odb.Core.Layers.Layer2.Meta.ClassInfo ci = GetSession().GetMetaModel().GetClassInfoFromId
				(classInfoId);
			bool withIndex = !ci.GetIndexes().IsEmpty();
			NeoDatis.Odb.Core.Layers.Layer2.Meta.NonNativeObjectInfo nnoi = null;
			// When there is index,we must *always* load the old meta representation
			// to compute index keys
			if (withIndex)
			{
				nnoi = objectReader.ReadNonNativeObjectInfoFromPosition(ci, header.GetOid(), objectPosition
					, true, false);
			}
			// a boolean value to indicate if object is in connected zone or not
			// This will be used to know if work can be done out of transaction
			// for unconnected object,changes can be written directly, else we must
			// use Transaction (using WriteAction)
			bool objectIsInConnectedZone = cache.ObjectWithIdIsInCommitedZone(header.GetOid()
				);
			// triggers
			// FIXME
			triggerManager.ManageDeleteTriggerBefore(ci.GetFullClassName(), null, header.GetOid
				());
			long nbObjects = ci.GetNumberOfObjects();
			NeoDatis.Odb.OID previousObjectOID = header.GetPreviousObjectOID();
			NeoDatis.Odb.OID nextObjectOID = header.GetNextObjectOID();
			if (NeoDatis.Odb.OdbConfiguration.IsDebugEnabled(LogId))
			{
				NeoDatis.Tool.DLogger.Debug("Deleting object with id " + header.GetOid() + " - In connected zone ="
					 + objectIsInConnectedZone + " -  with index =" + withIndex);
				NeoDatis.Tool.DLogger.Debug("position =  " + objectPosition + " | prev oid = " + 
					previousObjectOID + " | next oid = " + nextObjectOID);
			}
			bool isFirstObject = previousObjectOID == null;
			bool isLastObject = nextObjectOID == null;
			bool mustUpdatePreviousObjectPointers = false;
			bool mustUpdateNextObjectPointers = false;
			bool mustUpdateLastObjectOfCI = false;
			if (isFirstObject || isLastObject)
			{
				if (isFirstObject)
				{
					// The deleted object is the first, must update first instance
					// OID field of the class
					if (objectIsInConnectedZone)
					{
						// update first object oid of the class info in memory
						ci.GetCommitedZoneInfo().first = nextObjectOID;
					}
					else
					{
						// update first object oid of the class info in memory
						ci.GetUncommittedZoneInfo().first = nextObjectOID;
					}
					if (nextObjectOID != null)
					{
						// Update next object 'previous object oid' to null
						UpdatePreviousObjectFieldOfObjectInfo(nextObjectOID, null, objectIsInConnectedZone
							);
						mustUpdateNextObjectPointers = true;
					}
				}
				// It can be first and last
				if (isLastObject)
				{
					// The deleted object is the last, must update last instance
					// OID field of the class
					// update last object position of the class info in memory
					if (objectIsInConnectedZone)
					{
						// the object is a committed object
						ci.GetCommitedZoneInfo().last = previousObjectOID;
					}
					else
					{
						// The object is not committed and it is the last and is
						// being deleted
						ci.GetUncommittedZoneInfo().last = previousObjectOID;
					}
					if (previousObjectOID != null)
					{
						// Update 'next object oid' of previous object to null
						// if we are in unconnected zone, change can be done
						// directly,else it must be done in transaction
						UpdateNextObjectFieldOfObjectInfo(previousObjectOID, null, objectIsInConnectedZone
							);
						// Now update data of the cache
						mustUpdatePreviousObjectPointers = true;
						mustUpdateLastObjectOfCI = true;
					}
				}
			}
			else
//.........这里部分代码省略.........