/// <summary>
/// Gets the latest value in the cache.
/// </summary>
/// <param name="value">The value.</param>
public void GetLatest(DaValue value)
{
value.Value = this.Value;
value.Quality = this.Quality;
value.Timestamp = this.Timestamp;
value.Error = this.Error;
}
/// <summary>
/// Gets the local data value.
/// </summary>
/// <param name="remoteValue">The remote value.</param>
/// <returns>The local data value.</returns>
public DaValue GetLocalDataValue(DataValue remoteValue)
{
DaValue localValue = new DaValue();
localValue.Error = ComDaProxy.MapReadStatusToErrorCode(remoteValue.StatusCode);
if (localValue.Error >= 0)
{
localValue.HdaQuality = ComUtils.GetHdaQualityCode(remoteValue.StatusCode);
localValue.Timestamp = remoteValue.SourceTimestamp;
localValue.Error = ResultIds.S_OK;
if (localValue.Timestamp == DateTime.MinValue)
{
localValue.Timestamp = remoteValue.ServerTimestamp;
}
try
{
localValue.Value = GetLocalValue(remoteValue.WrappedValue);
}
catch
{
localValue.Error = ResultIds.E_BADTYPE;
}
}
return(localValue);
}
/// <summary>
/// Reads the attribute values from the server.
/// </summary>
/// <param name="valuesToRead">The values to read.</param>
/// <returns>
/// The values read.
/// </returns>
public DaValue[] Read(ReadValueIdCollection valuesToRead)
{
TraceState("Read", valuesToRead.Count);
// check for valid session.
Session session = m_session;
if (session == null)
{
throw ComUtils.CreateComException(ResultIds.E_FAIL);
}
int masterError = ResultIds.E_FAIL;
DaValue[] results = new DaValue[valuesToRead.Count];
if (session != null)
{
try
{
// read the values.
DataValueCollection values = null;
DiagnosticInfoCollection diagnosticInfos = null;
session.Read(
null,
0,
TimestampsToReturn.Both,
valuesToRead,
out values,
out diagnosticInfos);
ClientBase.ValidateResponse(values, valuesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, valuesToRead);
// convert the response.
for (int ii = 0; ii < values.Count; ii++)
{
results[ii] = m_mapper.GetLocalDataValue(values[ii]);
}
// return the results.
return(results);
}
catch (Exception e)
{
masterError = ComUtils.GetErrorCode(e, ResultIds.E_FAIL);
}
}
// report any unexpected errors.
for (int ii = 0; ii < results.Length; ii++)
{
DaValue result = results[ii] = new DaValue();
result.Error = masterError;
}
return(results);
}
/// <summary>
/// Converts a UA value to an HDA attribute value.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="attributeId">The attribute id.</param>
/// <param name="values">The values.</param>
/// <param name="index">The index.</param>
/// <returns></returns>
private DaValue GetAttributeValue(Session session, uint attributeId, DataValueCollection values, int index)
{
switch (attributeId)
{
case Constants.OPCHDA_DATA_TYPE:
{
DaValue result = new DaValue();
DataValue value = values[index];
// check for valid node.
if (StatusCode.IsBad(value.StatusCode))
{
result.Error = ResultIds.E_UNKNOWNITEMID;
return(result);
}
// covert to var type.
NodeId dataTypeId = value.GetValue <NodeId>(DataTypeIds.BaseDataType);
int valueRank = values[index + 1].GetValue <int>(ValueRanks.Scalar);
BuiltInType builtInType = DataTypes.GetBuiltInType(dataTypeId, session.TypeTree);
TypeInfo typeInfo = new TypeInfo(builtInType, valueRank);
short varType = (short)ComUtils.GetVarType(typeInfo);
result.Value = varType;
result.Quality = ComUtils.GetQualityCode(value.StatusCode);
result.Timestamp = value.ServerTimestamp;
result.Error = ResultIds.S_OK;
return(result);
}
case Constants.OPCHDA_DESCRIPTION:
{
DataValue value = values[index];
if (value.StatusCode == StatusCodes.BadAttributeIdInvalid)
{
DaValue result = new DaValue();
result.Error = ResultIds.E_INVALIDATTRID;
return(result);
}
return(m_mapper.GetLocalDataValue(value));
}
default:
{
return(ComHdaProxy.GetAttributeValue(session, m_mapper, attributeId, values[index]));
}
}
}
/// <summary>
/// Gets the remote data value.
/// </summary>
/// <param name="localValue">The local value.</param>
/// <param name="remoteType">The remote data type.</param>
/// <returns>The remote data value.</returns>
/// <exception cref="COMException">Thrown if a conversion error occurs.</exception>
public DataValue GetRemoteDataValue(DaValue localValue, TypeInfo remoteType)
{
DataValue remoteValue = new DataValue();
remoteValue.SourceTimestamp = localValue.Timestamp;
if (localValue.Error < 0)
{
throw ComUtils.CreateComException(localValue.Error);
}
remoteValue.StatusCode = ComUtils.GetHdaQualityCode(localValue.HdaQuality);
try
{
remoteValue.WrappedValue = GetRemoteValue(new Variant(localValue.Value), remoteType);
}
catch (Exception e)
{
throw ComUtils.CreateComException(e, ResultIds.E_BADTYPE);
}
return(remoteValue);
}
/// <summary>
/// Reads the current values for the specified attributes.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="itemHandle">The item handle.</param>
/// <param name="attributeIds">The attribute ids.</param>
/// <returns></returns>
public DaValue[] ReadCurrentValues(Session session, HdaItemHandle itemHandle, uint[] attributeIds)
{
DaValue[] results = new DaValue[attributeIds.Length];
// check handle.
InternalHandle handle = itemHandle as InternalHandle;
if (handle == null)
{
for (int ii = 0; ii < results.Length; ii++)
{
results[ii] = new DaValue();
results[ii].Error = ResultIds.E_INVALIDHANDLE;
}
return(results);
}
// look up the supported attributes for an item.
ReadValueIdCollection supportedAttributes = handle.Item.SupportedAttributes;
if (supportedAttributes == null)
{
handle.Item.SupportedAttributes = supportedAttributes = GetAvailableAttributes(session, handle.NodeId);
}
// build list of values to read.
ReadValueIdCollection valuesToRead = new ReadValueIdCollection();
List <int> indexes = new List <int>();
for (int ii = 0; ii < attributeIds.Length; ii++)
{
ReadValueId valueToRead = GetReadValueId(supportedAttributes, attributeIds[ii]);
if (valueToRead == null)
{
results[ii] = new DaValue();
results[ii].Error = ResultIds.E_INVALIDATTRID;
continue;
}
valuesToRead.Add(valueToRead);
indexes.Add(ii);
// need to fetch the value rank as well.
if (attributeIds[ii] == Constants.OPCHDA_DATA_TYPE)
{
valuesToRead.Add(GetReadValueId(supportedAttributes, ComHdaProxy.INTERNAL_ATTRIBUTE_VALUE_RANK));
indexes.Add(-1);
}
}
// nothing to do.
if (valuesToRead.Count == 0)
{
return(results);
}
// read values from the UA server.
DataValueCollection values = null;
DiagnosticInfoCollection diagnosticInfos = null;
session.Read(
null,
0,
TimestampsToReturn.Neither,
valuesToRead,
out values,
out diagnosticInfos);
// validate response from the UA server.
ClientBase.ValidateResponse(values, valuesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, valuesToRead);
// assign a local handle to all valid items.
for (int ii = 0; ii < valuesToRead.Count; ii++)
{
int index = indexes[ii];
uint attributeId = (uint)valuesToRead[ii].Handle;
// check for values which are combined with other values to create the value (e.g. ValueRank).
if (index == -1)
{
continue;
}
results[index] = GetAttributeValue(session, attributeId, values, ii);
// only support current value for now.
if (results[index].Error == ResultIds.S_OK)
{
results[index].Error = ResultIds.S_CURRENTVALUE;
}
}
return(results);
}
