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 _make_relative_path(self, 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)
return rpath
