implement descriptor protocol for FileList and DirectoryDict
Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>
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1 changed files with 33 additions and 0 deletions
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@ -87,6 +87,22 @@ class FileList(collections.MutableSequence):
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self.__write(lines)
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class FileListProperty(FileList):
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# Descriptor Protocol
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def __get__(self, obj, objtype=None):
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if obj is None:
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return self.__class__
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return self
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def __set__(self, obj, value):
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os.unlink(self._path)
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for item in value:
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self.append(item)
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def __delete__(self, obj):
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raise AttributeError("can't delete attribute")
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class DirectoryDict(collections.MutableMapping):
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"""A dict that stores it's state in a directory.
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@ -120,3 +136,20 @@ class DirectoryDict(collections.MutableMapping):
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def __len__(self):
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return len(os.listdir(self._path))
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class DirectoryDictProperty(DirectoryDict):
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# Descriptor Protocol
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def __get__(self, obj, objtype=None):
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if obj is None:
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return self.__class__
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return self
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def __set__(self, obj, value):
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for name in self.keys():
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del self[name]
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if value is not None:
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self.update(value)
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def __delete__(self, obj):
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raise AttributeError("can't delete attribute")
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