def get_child(self, path):
"""
get a child specified by its path from this node.
A path might be:
* a string representing a qualified name.
* a qualified name
* a list of string
* a list of qualified names
"""
if type(path) not in (list, tuple):
path = [path]
rpath = ua.RelativePath()
for item in path:
el = ua.RelativePathElement()
el.ReferenceTypeId = ua.TwoByteNodeId(
ua.ObjectIds.HierarchicalReferences)
el.IsInverse = False
el.IncludeSubtypes = True
if isinstance(item, ua.QualifiedName):
el.TargetName = item
else:
el.TargetName = ua.QualifiedName.from_string(item)
rpath.Elements.append(el)
bpath = ua.BrowsePath()
bpath.StartingNode = self.nodeid
bpath.RelativePath = rpath
result = self.server.translate_browsepaths_to_nodeids([bpath])
result = result[0]
result.StatusCode.check()
# FIXME: seems this method may return several nodes
return Node(self.server, result.Targets[0].TargetId)
def get_children_descriptions(self,
refs=ua.ObjectIds.HierarchicalReferences,
nodeclassmask=ua.NodeClass.Unspecified,
includesubtypes=True):
desc = ua.BrowseDescription()
desc.BrowseDirection = ua.BrowseDirection.Forward
desc.ReferenceTypeId = ua.TwoByteNodeId(refs)
desc.IncludeSubtypes = includesubtypes
desc.NodeClassMask = nodeclassmask
desc.ResultMask = ua.BrowseResultMask.All
desc.NodeId = self.nodeid
params = ua.BrowseParameters()
params.NodesToBrowse.append(desc)
results = self.server.browse(params)
return results[0].References
def get_objects_node(self):
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.ObjectsFolder))
def get_server_node(self):
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.Server))
def get_root_node(self):
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.RootFolder))