public Namespace GetNamespace(INamespaceParent parent, string relativeName, bool ignoreCase)
{
// WMI is very slow, so do everything possible to minimise WMI access. We need to load all the
// namespaces in the hierarchy (from the parent to the one being sought), because any of them
// may have enabled events. Get them all in one query.
// Build a query that gets all the namespaces we need (if they exist).
string[] nsParts = relativeName.Split('.');
string parentFullName = parent.FullName;
string queryString = BuildQueryStringForNamespaces(nsParts, parentFullName);
// WQL is case-insensitive, so if ignoreCase is false use the Hashtable created below to filter.
Hashtable namespaces = ignoreCase ? new Hashtable(StringComparer.InvariantCultureIgnoreCase) : new Hashtable();
var searcher = new ManagementObjectSearcher(_scope, new ObjectQuery(queryString));
// Read the namespaces returned and store them temporarily in a Hasthable. We cannot create
// Namespace objects as we go, because they may be returned out of order (ie. children before parents).
using (ManagementObjectCollection configs = searcher.Get())
{
foreach (ManagementObject config in configs)
{
var details = new NamespaceDetails();
var nsName = (string)WmiUtil.GetPropertyValue(config, Constants.Wmi.NameProperty);
var nsParentName = (string)WmiUtil.GetPropertyValue(config, Constants.Wmi.ParentProperty);
var enabledEvents = (string)WmiUtil.GetPropertyValue(config, Constants.Wmi.Namespace.EnabledEventsProperty);
var mixedEvents = (string)WmiUtil.GetPropertyValue(config, Constants.Wmi.Namespace.MixedEventsProperty);
details._enabledEvents = SplitString(enabledEvents, Constants.Module.ListSeparator);
details._mixedEvents = SplitString(mixedEvents, Constants.Module.ListSeparator);
namespaces.Add(CatalogueName.GetFullNameUnchecked(nsParentName, nsName), details);
}
}
// Now that we have all the details create the hierarchy of Namespace objects.
Catalogue catalogue = parent.Catalogue;
Namespace ns = null;
foreach (string nsName in nsParts)
{
string nsFullName = CatalogueName.GetFullNameUnchecked(parentFullName, nsName);
var details = (NamespaceDetails)namespaces[nsFullName];
if (details == null)
{
return(null); // One of the namespaces in the path was not found in WMI.
}
ns = catalogue.CreateNamespace(parent, nsName, details._enabledEvents, details._mixedEvents);
parent.AddIfNotLoaded(ns);
parentFullName = nsFullName;
parent = ns;
}
return(ns);
}
