/// <summary>
/// Adds a DataValue to a list of values to return.
/// </summary>
private void AddValue(
TimestampsToReturn timestampsToReturn,
NumericRange indexRange,
QualifiedName dataEncoding,
DataValueCollection values,
DataValue value)
{
// ignore invalid case.
if (value == null)
{
return;
}
// save the last timestamp returned.
m_lastTime = value.ServerTimestamp;
// check if the index range or data encoding can be applied.
if (StatusCode.IsGood(value.StatusCode))
{
object valueToReturn = value.Value;
// apply the index range.
if (indexRange != NumericRange.Empty)
{
StatusCode error = indexRange.ApplyRange(ref valueToReturn);
if (StatusCode.IsBad(error))
{
value.Value = null;
value.StatusCode = error;
}
else
{
value.Value = valueToReturn;
}
}
// apply the data encoding.
if (!QualifiedName.IsNull(dataEncoding))
{
value.Value = null;
value.StatusCode = StatusCodes.BadDataEncodingUnsupported;
}
}
// apply the timestamps filter.
if (timestampsToReturn == TimestampsToReturn.Neither || timestampsToReturn == TimestampsToReturn.Server)
{
value.SourceTimestamp = DateTime.MinValue;
}
if (timestampsToReturn == TimestampsToReturn.Neither || timestampsToReturn == TimestampsToReturn.Source)
{
value.ServerTimestamp = DateTime.MinValue;
}
// add result.
values.Add(value);
}
/// <summary>
/// Adds index ranges to the collection.
/// </summary>
private void AddWriteValues(
Node node,
WriteValueCollection nodesToWrite,
params uint[] attributeIds)
{
if (attributeIds != null)
{
for (int ii = 0; ii < attributeIds.Length; ii++)
{
WriteValue nodeToWrite = new WriteValue();
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
DataValue value = new DataValue();
ServiceResult result = node.Read(
null,
attributeIds[ii],
value);
value.StatusCode = StatusCodes.Good;
value.ServerTimestamp = DateTime.MinValue;
value.SourceTimestamp = DateTime.MinValue;
if (ServiceResult.IsBad(result))
{
value.Value = null;
}
nodeToWrite.Value = value;
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
Array array = value.Value as Array;
if (array != null)
{
NumericRange range = new NumericRange(0, 1);
object subarray = array;
range.ApplyRange(ref subarray);
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = subarray;
nodeToWrite.Value.StatusCode = StatusCodes.Good;
nodeToWrite.Value.ServerTimestamp = DateTime.MinValue;
nodeToWrite.Value.SourceTimestamp = DateTime.MinValue;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.IndexRange = "0";
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
}
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = value.Value;
nodeToWrite.Value.StatusCode = StatusCodes.Uncertain;
nodeToWrite.Value.ServerTimestamp = DateTime.MinValue;
nodeToWrite.Value.SourceTimestamp = DateTime.MinValue;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = value.Value;
nodeToWrite.Value.StatusCode = StatusCodes.Good;
nodeToWrite.Value.ServerTimestamp = DateTime.UtcNow;
nodeToWrite.Value.SourceTimestamp = DateTime.MinValue;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = value.Value;
nodeToWrite.Value.StatusCode = StatusCodes.Good;
nodeToWrite.Value.ServerTimestamp = DateTime.MinValue;
nodeToWrite.Value.SourceTimestamp = DateTime.UtcNow;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
}
}
}
/// <summary>
/// Reads the value for an attribute of a node.
/// </summary>
public DataValue ReadAttributeValue(
IOperationContext context,
ExpandedNodeId typeDefinitionId,
IList<QualifiedName> relativePath,
uint attributeId,
NumericRange indexRange)
{
lock (DataLock)
{
// check for match on the event type being searched.
if (!Server.TypeTree.IsTypeOf(TypeDefinitionId, typeDefinitionId))
{
return new DataValue(StatusCodes.BadNotSupported);
}
// find the target.
NodeSource target = this;
if (relativePath != null && relativePath.Count > 0)
{
target = Find(relativePath, 0);
if (target == null)
{
return new DataValue(StatusCodes.BadNotSupported);
}
}
// read the attribute value.
DataValue dataValue = new DataValue();
ServiceResult result = target.Read(context, attributeId, dataValue);
if (ServiceResult.IsBad(result))
{
return new DataValue(result.StatusCode);
}
// apply any index range.
object value = dataValue.Value;
result = indexRange.ApplyRange(ref value);
if (ServiceResult.IsBad(result))
{
return new DataValue(result.StatusCode);
}
dataValue.Value = value;
// return the value.
return dataValue;
}
}
/// <summary>
/// Adds index ranges to the collection.
/// </summary>
private void AddWriteValues(
Node node,
WriteValueCollection nodesToWrite,
params uint[] attributeIds)
{
if (attributeIds != null)
{
for (int ii = 0; ii < attributeIds.Length; ii++)
{
WriteValue nodeToWrite = new WriteValue();
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
DataValue value = new DataValue();
ServiceResult result = node.Read(
null,
attributeIds[ii],
value);
value.StatusCode = StatusCodes.Good;
value.ServerTimestamp = DateTime.MinValue;
value.SourceTimestamp = DateTime.MinValue;
if (ServiceResult.IsBad(result))
{
value.Value = null;
}
nodeToWrite.Value = value;
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
Array array = value.Value as Array;
if (array != null)
{
NumericRange range = new NumericRange(0, 1);
object subarray = array;
range.ApplyRange(ref subarray);
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = subarray;
nodeToWrite.Value.StatusCode = StatusCodes.Good;
nodeToWrite.Value.ServerTimestamp = DateTime.MinValue;
nodeToWrite.Value.SourceTimestamp = DateTime.MinValue;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.IndexRange = "0";
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
}
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = value.Value;
nodeToWrite.Value.StatusCode = StatusCodes.Uncertain;
nodeToWrite.Value.ServerTimestamp = DateTime.MinValue;
nodeToWrite.Value.SourceTimestamp = DateTime.MinValue;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = value.Value;
nodeToWrite.Value.StatusCode = StatusCodes.Good;
nodeToWrite.Value.ServerTimestamp = DateTime.UtcNow;
nodeToWrite.Value.SourceTimestamp = DateTime.MinValue;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
nodeToWrite = new WriteValue();
nodeToWrite.Value = new DataValue();
nodeToWrite.Value.Value = value.Value;
nodeToWrite.Value.StatusCode = StatusCodes.Good;
nodeToWrite.Value.ServerTimestamp = DateTime.MinValue;
nodeToWrite.Value.SourceTimestamp = DateTime.UtcNow;
nodeToWrite.NodeId = node.NodeId;
nodeToWrite.AttributeId = attributeIds[ii];
nodeToWrite.Handle = node;
nodesToWrite.Add(nodeToWrite);
}
}
}