internal static List <string> LookupFolder(Uri uri)
{
// The input URI may specify a folder which is invalid for pack URIs. If so,
// create a valid pack URI by adding a fake filename.
bool isFolder = IsFolderUri(uri);
if (isFolder)
{
uri = new Uri(uri, FakeFileName);
}
// The input Uri should now be a valid absolute pack application Uri.
// The caller (FontSourceCollection) guarantees that.
// Perform a sanity check to make sure the assumption stays the same.
Debug.Assert(uri.IsAbsoluteUri && uri.Scheme == PackUriHelper.UriSchemePack && BaseUriHelper.IsPackApplicationUri(uri));
Assembly uriAssembly;
string escapedPath;
BaseUriHelper.GetAssemblyAndPartNameFromPackAppUri(uri, out uriAssembly, out escapedPath);
if (uriAssembly == null)
{
return(null);
}
// If we added a fake filename to the uri, remove it from the escaped path.
if (isFolder)
{
Debug.Assert(escapedPath.EndsWith(FakeFileName, StringComparison.OrdinalIgnoreCase));
escapedPath = escapedPath.Substring(0, escapedPath.Length - FakeFileName.Length);
}
Dictionary <string, List <string> > folderResourceMap;
lock (_assemblyCaches)
{
if (!_assemblyCaches.TryGetValue(uriAssembly, out folderResourceMap))
{
folderResourceMap = new Dictionary <string, List <string> >(StringComparer.OrdinalIgnoreCase);
ConstructFontResourceCache(uriAssembly, folderResourceMap);
_assemblyCaches.Add(uriAssembly, folderResourceMap);
}
}
List <string> ret;
folderResourceMap.TryGetValue(escapedPath, out ret);
return(ret);
}