/// <summary>
/// Creates the NodeId for the specified node.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="node">The node.</param>
/// <returns>The new NodeId.</returns>
/// <remarks>
/// This method is called by the NodeState.Create() method which initializes a Node from
/// the type model. During initialization a number of child nodes are created and need to
/// have NodeIds assigned to them. This implementation constructs NodeIds by constructing
/// strings. Other implementations could assign unique integers or Guids and save the new
/// Node in a dictionary for later lookup.
/// </remarks>
public override NodeId New(ISystemContext context, NodeState node)
{
if (node is ServerStatusState)
{
return(node.NodeId);
}
return(ParsedNodeId.ConstructIdForComponent(node, NamespaceIndex));
}
/// <summary>
/// Constructs a NodeId from the BrowseName of an internal node.
/// </summary>
/// <param name="browseName">The browse name.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
/// <returns>The node id.</returns>
public static NodeId ConstructIdForInternalNode(QualifiedName browseName, ushort namespaceIndex)
{
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.RootId = browseName.Name;
parsedNodeId.NamespaceIndex = namespaceIndex;
parsedNodeId.RootType = InternalNode;
return parsedNodeId.Construct();
}
/// <summary>
/// Constructs the id for an area.
/// </summary>
/// <param name="areaId">The area id.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
/// <returns></returns>
public static NodeId ConstructIdForArea(string areaId, ushort namespaceIndex)
{
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.RootId = areaId;
parsedNodeId.NamespaceIndex = namespaceIndex;
parsedNodeId.RootType = AeArea;
return(parsedNodeId.Construct());
}
/// <summary>
/// Constructs the node id for a branch.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
public static NodeId ConstructIdForHdaBranch(string itemId, ushort namespaceIndex)
{
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.RootId = itemId;
parsedNodeId.NamespaceIndex = namespaceIndex;
parsedNodeId.RootType = HdaBranch;
return(parsedNodeId.Construct());
}
/// <summary>
/// Constructs the id for a source.
/// </summary>
/// <param name="areaId">The area id.</param>
/// <param name="sourceName">Name of the source.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
/// <returns></returns>
public static NodeId ConstructIdForSource(string areaId, string sourceName, ushort namespaceIndex)
{
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.RootType = AeSource;
parsedNodeId.RootId = areaId;
parsedNodeId.NamespaceIndex = namespaceIndex;
parsedNodeId.ComponentPath = sourceName;
return(parsedNodeId.Construct());
}
/// <summary>
/// Constructs the node id for an item attribute.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <param name="attributeId">The attribute id.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
/// <returns></returns>
public static NodeId ConstructIdForHdaItemAttribute(string itemId, uint attributeId, ushort namespaceIndex)
{
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.RootId = itemId;
parsedNodeId.NamespaceIndex = namespaceIndex;
parsedNodeId.RootType = HdaItemAttribute;
parsedNodeId.ComponentPath = attributeId.ToString();
return(parsedNodeId.Construct());
}
/// <summary>
/// Constructs the node id for an aggregate function.
/// </summary>
/// <param name="aggregateId">The aggregate id.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
/// <returns></returns>
public static NodeId ConstructIdForHdaAggregate(uint aggregateId, ushort namespaceIndex)
{
// check for built in aggregates.
NodeId nodeId = ComUtils.GetHdaAggregateId(aggregateId);
if (nodeId != null)
{
return(nodeId);
}
// server specific aggregates.
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.RootId = aggregateId.ToString();
parsedNodeId.NamespaceIndex = namespaceIndex;
parsedNodeId.RootType = HdaAggregate;
return(parsedNodeId.Construct());
}
/// <summary>
/// Constructs the node identifier for a component.
/// </summary>
/// <param name="component">The component.</param>
/// <param name="namespaceIndex">Index of the namespace.</param>
/// <returns>The node identifier for a component.</returns>
public static NodeId ConstructIdForComponent(NodeState component, ushort namespaceIndex)
{
return ParsedNodeId.ConstructIdForComponent(component, namespaceIndex);
}
/// <summary>
/// Parses the specified node identifier.
/// </summary>
/// <param name="nodeId">The node identifier.</param>
/// <returns>The parsed node identifier. Null if the identifier cannot be parsed.</returns>
public static ParsedNodeId Parse(NodeId nodeId)
{
// can only parse non-null string node identifiers.
if (NodeId.IsNull(nodeId))
{
return null;
}
string identifier = nodeId.Identifier as string;
if (String.IsNullOrEmpty(identifier))
{
return null;
}
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.NamespaceIndex = nodeId.NamespaceIndex;
int start = 0;
// extract the type of identifier.
parsedNodeId.RootType = (int)ExtractNumber(identifier, ref start);
if (start >= identifier.Length || identifier[start] != ':')
{
return null;
}
// extract any component path.
StringBuilder buffer = new StringBuilder();
int index = start+1;
int end = identifier.Length;
bool escaped = false;
while (index < end)
{
char ch = identifier[index++];
// skip any escape character but keep the one after it.
if (ch == '&')
{
escaped = true;
continue;
}
if (!escaped && ch == '?')
{
end = index;
break;
}
buffer.Append(ch);
escaped = false;
}
// extract any component.
parsedNodeId.RootId = buffer.ToString();
parsedNodeId.ComponentPath = null;
if (end < identifier.Length)
{
parsedNodeId.ComponentPath = identifier.Substring(end);
}
return parsedNodeId;
}
/// <summary>
/// Parses the specified node identifier.
/// </summary>
/// <param name="nodeId">The node identifier.</param>
/// <returns>The parsed node identifier. Null if the identifier cannot be parsed.</returns>
public static ParsedNodeId Parse(NodeId nodeId)
{
// can only parse non-null string node identifiers.
if (NodeId.IsNull(nodeId))
{
return(null);
}
string identifier = nodeId.Identifier as string;
if (String.IsNullOrEmpty(identifier))
{
return(null);
}
ParsedNodeId parsedNodeId = new ParsedNodeId();
parsedNodeId.NamespaceIndex = nodeId.NamespaceIndex;
int start = 0;
// extract the type of identifier.
parsedNodeId.RootType = (int)ExtractNumber(identifier, ref start);
if (start >= identifier.Length || identifier[start] != ':')
{
return(null);
}
// extract any component path.
StringBuilder buffer = new StringBuilder();
int index = start + 1;
int end = identifier.Length;
bool escaped = false;
while (index < end)
{
char ch = identifier[index++];
// skip any escape character but keep the one after it.
if (ch == '&')
{
escaped = true;
continue;
}
if (!escaped && ch == '?')
{
end = index;
break;
}
buffer.Append(ch);
escaped = false;
}
// extract any component.
parsedNodeId.RootId = buffer.ToString();
parsedNodeId.ComponentPath = null;
if (end < identifier.Length)
{
parsedNodeId.ComponentPath = identifier.Substring(end);
}
return(parsedNodeId);
}
