Changeset 431

Timestamp:

01/27/03 23:40:16 (6 years ago)

Author:

sholloway

Message:

*** empty log message ***

Files:

• trunk/RBFoundation/RBFoundation/Aspects/Aspect.py (deleted)
• trunk/RBFoundation/RBFoundation/Aspects/__init__.py (modified) (1 diff)

trunk/RBFoundation/RBFoundation/Aspects/__init__.py

@@ -20 +20 @@
-##~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#~ Definitions 
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
+class Aspect(object):
+    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    #~ Special 
+    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    def __new__(klass, *args, **kw):
+        result = super(Aspect, klass).__new__(klass, *args, **kw)
+        klass.OnAspectInsert(result)
+        return result
+
+    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    #~ Public Methods 
+    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    def OnAspectInsert(self): pass
+    def OnAspectRemove(self): pass
+
+    def MetaAspect(klass, name, bases, data):
+        baseresult = type(name, bases, data)
+        name = '%s & %s' % (name, klass.__name__)
+        indict = {'_otherclass' : baseresult}
+        return type(name, (klass, baseresult), indict)
+    MetaAspect = classmethod(MetaAspect)
+
+    def InsertAspect(klass, obj):
+        indict = {'_otherclass' : obj.__class__, '_aspectclass':klass}
+        name = '%s & %s' % (obj.__class__.__name__, klass.__name__)
+        obj.__class__ = type(name, (klass, obj.__class__), indict)
+        klass.OnAspectInsert(obj)
+        return obj
+    InsertAspect = classmethod(InsertAspect)
+
+    def RemoveAspect(self):
+        assert isinstance(self, Aspect)
+        self.OnAspectRemove()
+        result = self._aspectclass
+        self.__class__ = self._otherclass
+        return result
+
+    def RemoveAllAspects(self):
+        result = []
+        while isinstance(self, Aspect):
+            result.append(self.RemoveAspect())
+        return result
+
+    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    #~ Protected Methods 
+    #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    def _AspectedOperation(self, method, *args, **kw):
+        """Wrapper so 'method' can be called in the origional class configuration"""
+        try: 
+            thisclass = self.__class__
+            self.__class__ = self._otherclass
+            result = method(*args, **kw)
+        finally:
+            self.__class__ = thisclass
+        return result
+