/// <summary>
/// Explore a folder on the Opc Server
/// </summary>
/// <param name="tag">The fully-qualified identifier of the tag. You can specify a subfolder by using a comma delimited name.
/// E.g: the tag `foo.bar` finds the sub nodes of `bar` on the folder `foo`</param>
/// <returns>The list of sub-nodes</returns>
public IEnumerable <UaNode> ExploreFolder(string tag)
{
IList <UaNode> nodes;
_folderCache.TryGetValue(tag, out nodes);
if (nodes != null)
{
return(nodes);
}
var folder = FindNode(tag);
nodes = ClientUtils.Browse(_session, folder.NodeId)
.GroupBy(n => n.NodeId) //this is to select distinct
.Select(n => n.First())
.Where(n => n.NodeClass == NodeClass.Variable || n.NodeClass == NodeClass.Object)
.Select(n => n.ToHylaNode(folder))
.ToList();
//add nodes to cache
if (!_folderCache.ContainsKey(tag))
{
_folderCache.Add(tag, nodes);
}
foreach (var node in nodes)
{
AddNodeToCache(node);
}
return(nodes);
}
/// <summary>
/// Explore a folder on the Opc Server
/// </summary>
/// <param name="tag">The fully-qualified identifier of the tag. You can specify a subfolder by using a comma delimited name.
/// E.g: the tag `foo.bar` finds the sub nodes of `bar` on the folder `foo`</param>
/// <returns>The list of sub-nodes</returns>
public IEnumerable <UaNode> ExploreFolder(string tag)
{
var folder = FindNode(tag);
var nodes = ClientUtils.Browse(_session, folder.NodeId)
.GroupBy(n => n.NodeId) //this is to select distinct
.Select(n => n.First())
.Where(n => n.NodeClass == NodeClass.Variable || n.NodeClass == NodeClass.Object)
.Select(n => n.ToHylaNode(this, folder))
.ToList();
//add nodes to cache
foreach (var node in nodes)
{
AddNodeToCache(node);
}
return(nodes);
}