--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools.py Sun Feb 03 23:39:27 2008 +0100
@@ -0,0 +1,62 @@
+class AbstractRegister(object):
+ _instance = None
+ _registered_type = None
+ def __new__(cls):
+ # implements a singleton
+ if cls._instance is None:
+ #debug('Instanciating %s', cls.__name__)
+ cls._instance = super(AbstractRegister, cls).__new__(cls)
+ cls._instance.registered = {}
+ cls._instance.accepts = set()
+ return cls._instance
+
+ def add(self, cls):
+ assert issubclass(cls, self._registered_type)
+ if cls is self._registered_type:
+ return
+ if cls._accepts is None:
+ return
+ #assert isinstance(cls._accepts, (basestring, tuple))
+
+ #debug("Registerered %s for %s", cls.__name__)
+ if not isinstance(cls._accepts, tuple):
+ cls._accepts = (cls._accepts,)
+ for key in cls._accepts:
+ key = self._get_typ(key)
+ #debug(" new key = %s", key)
+ self.registered.setdefault(key, []).append(cls)
+ self.accepts.add(key)
+
+ def _get_typ(self, typ):
+ if not isinstance(typ, basestring):
+ if not isinstance(typ, type):
+ return None
+ typ = typ.__name__
+ return typ
+
+ def __contains__(self, val):
+ val = self._get_typ(val)
+ return val in self.accepts
+
+ def get_class(self, typ):
+ item = typ
+ if not isinstance(typ, type):
+ typ = typ.__class__
+ name = typ.__name__
+ #debug("Looking a widget for %s", typ.__name__)
+ orig_typ = typ
+ while typ is not None:
+ if typ.__name__ in self.registered:
+ for w in self.registered[typ.__name__]:
+ if w._filter is None or w._filter(item):
+ #debug("Widget for %s is %s", typ.__name__, w)
+ return w#self.registered[typ.__name__]
+ if typ.__bases__:
+ typ = typ.__bases__[0]
+ if typ == object:
+ typ = None
+ elif typ.__name__ in ("ObjectItem_", "AbstractListItem_"):
+ typ = orig_typ._type
+ else:
+ typ = None
+ raise ValueError('No registered class for %s' % (name))