def _add_to_object_list(self, objlist, obj, objtype):
"""
Adds a value to a list of objects.
The `obj` and any objects in the `objlist`
must be instances of that type. The `objlist` may be None.
If `obj` is not currently a member of the list, it is appended
to the list. If it is already a member, the list returned will
have the same members as the original list.
:param: objlist: A list of objects, possibly None
:param: obj: An object
:param: objtype: The required type of the objects and the list
:return: The updated list.
"""
validate_type(obj,objtype)
found = False
newlist = []
if objlist is not None:
validate_list_of_type(objlist, objtype)
for item in objlist:
found = found or item is obj
newlist.append(item)
if not found:
newlist.append(obj)
return newlist
def _add_to_object_list(self, objlist, obj, objtype):
"""
Adds a value to a list of objects.
The `obj` and any objects in the `objlist`
must be instances of that type. The `objlist` may be None.
If `obj` is not currently a member of the list, it is appended
to the list. If it is already a member, the list returned will
have the same members as the original list.
:param: objlist: A list of objects, possibly None
:param: obj: An object
:param: objtype: The required type of the objects and the list
:return: The updated list.
"""
validate_type(obj, objtype)
found = False
newlist = []
if objlist is not None:
validate_list_of_type(objlist, objtype)
for item in objlist:
found = found or item is obj
newlist.append(item)
if not found:
newlist.append(obj)
return newlist
def _remove_from_object_list(self, objlist, obj, objtype):
"""
Removes a value from the list.
The `obj` and any objects in the `objlist`
must be instances of that type. The `objlist` may be None.
If `obj` is currently a member of the list, it is removed.
The resulting list is returned. If the resulting list is empty,
None is returned.
:param: objlist: A list of objects, possibly None
:param: obj: An object
:param: objtype: The required type of the objects and the list
:return: The updated list.
"""
validate_type(obj,objtype)
newlist = []
if objlist is not None:
validate_list_of_type(objlist, objtype)
for item in objlist:
if item is not obj:
newlist.append(item)
if newlist:
return newlist
else:
return None
def _remove_from_object_list(self, objlist, obj, objtype):
"""
Removes a value from the list.
The `obj` and any objects in the `objlist`
must be instances of that type. The `objlist` may be None.
If `obj` is currently a member of the list, it is removed.
The resulting list is returned. If the resulting list is empty,
None is returned.
:param: objlist: A list of objects, possibly None
:param: obj: An object
:param: objtype: The required type of the objects and the list
:return: The updated list.
"""
validate_type(obj, objtype)
newlist = []
if objlist is not None:
validate_list_of_type(objlist, objtype)
for item in objlist:
if item is not obj:
newlist.append(item)
if newlist:
return newlist
else:
return None
