Module backend

Backends should derive from this class.

Created on Jun 27, 2011

Author: tmetsch

Classes

KindBackend
A prototype backend which essentially does nothing.

ActionBackend
A prototype backend which essentially does nothing.

MixinBackend
A prototype backend which essentially does nothing.

UserDefinedMixinBackend
A Backend for mixins defined by users.

Functions

is_related_valid(link)
Verifies that a link is consistent.

source code

is_attr_mutable(category, attribute_name)
Checks if an attribute is mutable.

source code

is_attr_required(category, attribute_name)
Checks if an attribute is required.

source code

is_action_applicable(entity, action)
Returns true if the action is currently applicable.

source code

Variables

__package__ = None

Function Details

Verifies that a link is consistent.

link -- The link which should be verified.

Checks if an attribute is mutable. Return True if so.

category -- The category which defines the attribute. attribute_name -- The name of the attribute.

Checks if an attribute is required. Return True if so.

category -- The category which defines the attribute. attribute_name -- The name of the attribute.

Returns true if the action is currently applicable.

entity -- The current entity. action -- The action to test for.