Mercurial > pygpibtoolkit / file comparison
comparison: tools.py
tools.py
- changeset 35
- 3b7a38af5c42
- child 36
- cb4124e3e75b
equal
deleted
inserted
replaced
| 34:022e881b758e | 35:3b7a38af5c42 |
|---|---|
| 1 class AbstractRegister(object): | |
| 2 _instance = None | |
| 3 _registered_type = None | |
| 4 def __new__(cls): | |
| 5 # implements a singleton | |
| 6 if cls._instance is None: | |
| 7 #debug('Instanciating %s', cls.__name__) | |
| 8 cls._instance = super(AbstractRegister, cls).__new__(cls) | |
| 9 cls._instance.registered = {} | |
| 10 cls._instance.accepts = set() | |
| 11 return cls._instance | |
| 12 | |
| 13 def add(self, cls): | |
| 14 assert issubclass(cls, self._registered_type) | |
| 15 if cls is self._registered_type: | |
| 16 return | |
| 17 if cls._accepts is None: | |
| 18 return | |
| 19 #assert isinstance(cls._accepts, (basestring, tuple)) | |
| 20 | |
| 21 #debug("Registerered %s for %s", cls.__name__) | |
| 22 if not isinstance(cls._accepts, tuple): | |
| 23 cls._accepts = (cls._accepts,) | |
| 24 for key in cls._accepts: | |
| 25 key = self._get_typ(key) | |
| 26 #debug(" new key = %s", key) | |
| 27 self.registered.setdefault(key, []).append(cls) | |
| 28 self.accepts.add(key) | |
| 29 | |
| 30 def _get_typ(self, typ): | |
| 31 if not isinstance(typ, basestring): | |
| 32 if not isinstance(typ, type): | |
| 33 return None | |
| 34 typ = typ.__name__ | |
| 35 return typ | |
| 36 | |
| 37 def __contains__(self, val): | |
| 38 val = self._get_typ(val) | |
| 39 return val in self.accepts | |
| 40 | |
| 41 def get_class(self, typ): | |
| 42 item = typ | |
| 43 if not isinstance(typ, type): | |
| 44 typ = typ.__class__ | |
| 45 name = typ.__name__ | |
| 46 #debug("Looking a widget for %s", typ.__name__) | |
| 47 orig_typ = typ | |
| 48 while typ is not None: | |
| 49 if typ.__name__ in self.registered: | |
| 50 for w in self.registered[typ.__name__]: | |
| 51 if w._filter is None or w._filter(item): | |
| 52 #debug("Widget for %s is %s", typ.__name__, w) | |
| 53 return w#self.registered[typ.__name__] | |
| 54 if typ.__bases__: | |
| 55 typ = typ.__bases__[0] | |
| 56 if typ == object: | |
| 57 typ = None | |
| 58 elif typ.__name__ in ("ObjectItem_", "AbstractListItem_"): | |
| 59 typ = orig_typ._type | |
| 60 else: | |
| 61 typ = None | |
| 62 raise ValueError('No registered class for %s' % (name)) |
