/// <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 = DaModelUtils.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 = DaModelUtils.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>
/// Verifies that the specified node exists.
/// </summary>
protected override NodeState ValidateNode(
ServerSystemContext context,
NodeHandle handle,
IDictionary <NodeId, NodeState> cache)
{
// not valid if no root.
if (handle == null)
{
return(null);
}
// check if previously validated.
if (handle.Validated)
{
return(handle.Node);
}
NodeState target = null;
// check if already in the cache.
if (cache != null)
{
if (cache.TryGetValue(handle.NodeId, out target))
{
// nulls mean a NodeId which was previously found to be invalid has been referenced again.
if (target == null)
{
return(null);
}
handle.Node = target;
handle.Validated = true;
return(handle.Node);
}
target = null;
}
try
{
// check if the node id has been parsed.
DaParsedNodeId parsedNodeId = handle.ParsedNodeId as DaParsedNodeId;
if (parsedNodeId == null)
{
return(null);
}
NodeState root = null;
DaElement element = null;
ComDaClient client = m_system.SelectClient(context, false);
// validate a branch or item.
if (parsedNodeId.RootType == DaModelUtils.DaElement)
{
element = client.FindElement(parsedNodeId.RootId);
// branch does not exist.
if (element == null)
{
return(null);
}
// create a temporary object to use for the operation.
root = DaModelUtils.ConstructElement(context, element, NamespaceIndex);
root.Handle = element;
AddAdditionalElementReferences(SystemContext, root);
}
// validate an property.
else if (parsedNodeId.RootType == DaModelUtils.DaProperty)
{
element = client.FindElement(parsedNodeId.RootId);
// branch does not exist.
if (element == null)
{
return(null);
}
// validate the property.
DaProperty property = client.FindProperty(parsedNodeId.RootId, parsedNodeId.PropertyId);
// property does not exist.
if (property == null)
{
return(null);
}
// create a temporary object to use for the operation.
root = DaModelUtils.ConstructProperty(context, element.ItemId, property, NamespaceIndex);
root.Handle = property;
AddAdditionalElementReferences(SystemContext, root);
}
// unknown root type.
else
{
return(null);
}
// all done if no components to validate.
if (String.IsNullOrEmpty(parsedNodeId.ComponentPath))
{
handle.Validated = true;
handle.Node = target = root;
return(handle.Node);
}
// validate component.
NodeState component = root.FindChildBySymbolicName(context, parsedNodeId.ComponentPath);
// component does not exist.
if (component == null)
{
return(null);
}
// found a valid component.
handle.Validated = true;
handle.Node = target = component;
return(handle.Node);
}
finally
{
// store the node in the cache to optimize subsequent lookups.
if (cache != null)
{
cache.Add(handle.NodeId, target);
}
}
}