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| author |   André Erdmann <dywi@mailerd.de> | 2013-09-12 18:29:57 +0200 |
|---|---|---|
| committer | André Erdmann <dywi@mailerd.de> | 2013-09-12 18:29:57 +0200 |
| commit | ea52078df34aab6562e49a73844e295d934a440d (patch) | |
| tree | c88e5be7f7e10fd8b91c1053d71d2ee40d80228c /roverlay/util | |
| parent | roverlay/fsutil: get fs dict from os.walk() (diff) | |
| download | R_overlay-ea52078df34aab6562e49a73844e295d934a440d.tar.gz R_overlay-ea52078df34aab6562e49a73844e295d934a440d.tar.bz2 R_overlay-ea52078df34aab6562e49a73844e295d934a440d.zip | |
roverlay/util/objects, NoneRef: get_static()
Diffstat (limited to 'roverlay/util')
| -rw-r--r-- | roverlay/util/objects.py | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/roverlay/util/objects.py b/roverlay/util/objects.py index a20b707..5ba2d69 100644 --- a/roverlay/util/objects.py +++ b/roverlay/util/objects.py @@ -66,6 +66,16 @@ class SafeWeakRef ( weakref.ref ): class NoneRef ( object ): """A 'reference' to None (compat object).""" + __instance = None + + @classmethod + def get_static ( cls, obj=None ): + assert obj is None + if cls.__instance is None: + cls.__instance = cls ( obj=obj ) + return cls.__instance + # --- end of get_static (...) --- + def __init__ ( self, obj=None ): super ( NoneRef, self ).__init__() assert obj is None @@ -101,7 +111,7 @@ def get_object_ref ( obj ): * obj -- """ if obj is None: - return NoneRef() + return NoneRef.get_static() elif isinstance ( obj, ( SafeWeakRef, NoneRef, weakref.ref ) ): return obj elif hasattr ( obj, 'get_ref' ): |