/// <summary>
/// Adds a read request for the specified property.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <param name="property">The property.</param>
/// <returns>The new request.</returns>
private ReadRequest Add(string itemId, DaProperty property)
{
if (m_index == null)
{
m_index = new Dictionary <string, ReadRequest>();
}
if (!String.IsNullOrEmpty(property.ItemId))
{
return(Add(property.ItemId));
}
return(Add(itemId, property.PropertyId));
}
/// <summary>
/// Initializes a new instance of the <see cref="DaPropertyState"/> class.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="itemId">The item id.</param>
/// <param name="property">The property.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
public DaPropertyState(
ISystemContext context,
string itemId,
DaProperty property,
ushort namespaceIndex)
:
base(null)
{
this.TypeDefinitionId = Opc.Ua.VariableTypeIds.DataItemType;
this.Description = null;
this.WriteMask = 0;
this.UserWriteMask = 0;
if (property != null)
{
Initialize(context, itemId, property, namespaceIndex);
}
}
/// <summary>
/// Initializes the node from the element.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="itemId">The item id.</param>
/// <param name="property">The property.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
public void Initialize(ISystemContext context, string itemId, DaProperty property, ushort namespaceIndex)
{
m_itemId = itemId;
m_property = property;
if (property == null)
{
return;
}
this.NodeId = ModelUtils.ConstructIdForDaElement(m_itemId, property.PropertyId, namespaceIndex);
this.BrowseName = new QualifiedName(property.Name, namespaceIndex);
this.DisplayName = new LocalizedText(property.Name);
this.TypeDefinitionId = Opc.Ua.VariableTypeIds.PropertyType;
this.Value = null;
this.StatusCode = StatusCodes.BadWaitingForInitialData;
this.Timestamp = DateTime.UtcNow;
bool isArray = false;
this.DataType = ComUtils.GetDataTypeId(property.DataType, out isArray);
this.ValueRank = (isArray)?ValueRanks.OneOrMoreDimensions:ValueRanks.Scalar;
this.ArrayDimensions = null;
// assume that properties with item ids are writeable. the server may still reject the write.
if (String.IsNullOrEmpty(property.ItemId))
{
this.AccessLevel = AccessLevels.CurrentRead;
}
else
{
this.AccessLevel = AccessLevels.CurrentReadOrWrite;
}
this.UserAccessLevel = this.AccessLevel;
this.MinimumSamplingInterval = MinimumSamplingIntervals.Indeterminate;
this.Historizing = false;
// add a reference to the parent node.
NodeId parentNodeId = ModelUtils.ConstructIdForDaElement(itemId, -1, namespaceIndex);
this.AddReference(ReferenceTypeIds.HasProperty, true, parentNodeId);
}
/// <summary>
/// Constructs a property node for a DA property.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="parentId">The parent id.</param>
/// <param name="property">The property.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
/// <returns>The property node.</returns>
public static PropertyState ConstructProperty(ISystemContext context, string parentId, DaProperty property, ushort namespaceIndex)
{
return(new DaPropertyState(context, parentId, property, namespaceIndex));
}
/// <summary>
/// Read the available non-built in properties from the server.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <param name="updateCache">if set to <c>true</c> the cache is updated.</param>
/// <returns>The array of properties.</returns>
public DaProperty[] ReadAvailableProperties(string itemId, bool updateCache)
{
string methodName = "IOPCItemProperties.QueryAvailableProperties";
// query for available properties.
int count = 0;
IntPtr pPropertyIds = IntPtr.Zero;
IntPtr pDescriptions = IntPtr.Zero;
IntPtr pDataTypes = IntPtr.Zero;
try
{
IOPCItemProperties server = BeginComCall <IOPCItemProperties>(methodName, true);
server.QueryAvailableProperties(
itemId,
out count,
out pPropertyIds,
out pDescriptions,
out pDataTypes);
}
catch (Exception e)
{
if (ComUtils.IsUnknownError(e, ResultIds.E_FAIL, ResultIds.E_UNKNOWNITEMID, ResultIds.E_INVALIDITEMID))
{
ComUtils.TraceComError(e, methodName);
}
return(null);
}
finally
{
EndComCall(methodName);
}
// unmarshal results.
int[] propertyIds = ComUtils.GetInt32s(ref pPropertyIds, count, true);
string[] descriptions = ComUtils.GetUnicodeStrings(ref pDescriptions, count, true);
short[] datatype = ComUtils.GetInt16s(ref pDataTypes, count, true);
List <DaProperty> properties = new List <DaProperty>();
for (int ii = 0; ii < count; ii++)
{
// do not return any of the built in properties.
if (propertyIds[ii] <= PropertyIds.TimeZone)
{
continue;
}
DaProperty property = new DaProperty();
property.PropertyId = propertyIds[ii];
property.Name = descriptions[ii];
property.DataType = datatype[ii];
properties.Add(property);
}
// fetch the item ids.
if (properties.Count > 0)
{
DaProperty[] array = properties.ToArray();
GetPropertyItemIds(itemId, array);
// update the cache.
if (updateCache)
{
lock (m_cache)
{
DaElement element = null;
if (m_cache.TryGetValue(itemId, out element))
{
element.Properties = array;
}
}
}
return(array);
}
return(null);
}