+Invoke the class method `notmuch.STATUS.status2str` with a status value as
+argument to receive a human readable string"""
+STATUS.__name__ = 'STATUS'
+
+
+class NotmuchError(Exception, Python3StringMixIn):
+ """Is initiated with a (notmuch.STATUS[, message=None]). It will not
+ return an instance of the class NotmuchError, but a derived instance
+ of a more specific Error Message, e.g. OutOfMemoryError. Each status
+ but SUCCESS has a corresponding subclassed Exception."""
+
+ @classmethod
+ def get_exc_subclass(cls, status):
+ """Returns a fine grained Exception() type,
+ detailing the error status"""
+ subclasses = {
+ STATUS.OUT_OF_MEMORY: OutOfMemoryError,
+ STATUS.READ_ONLY_DATABASE: ReadOnlyDatabaseError,
+ STATUS.XAPIAN_EXCEPTION: XapianError,
+ STATUS.FILE_ERROR: FileError,
+ STATUS.FILE_NOT_EMAIL: FileNotEmailError,
+ STATUS.DUPLICATE_MESSAGE_ID: DuplicateMessageIdError,
+ STATUS.NULL_POINTER: NullPointerError,
+ STATUS.TAG_TOO_LONG: TagTooLongError,
+ STATUS.UNBALANCED_FREEZE_THAW: UnbalancedFreezeThawError,
+ STATUS.UNBALANCED_ATOMIC: UnbalancedAtomicError,
+ STATUS.NOT_INITIALIZED: NotInitializedError,
+ }
+ assert 0 < status <= len(subclasses)
+ return subclasses[status]
+
+ def __new__(cls, *args, **kwargs):
+ """Return a correct subclass of NotmuchError if needed
+
+ We return a NotmuchError instance if status is None (or 0) and a
+ subclass that inherits from NotmuchError depending on the
+ 'status' parameter otherwise."""
+ # get 'status'. Passed in as arg or kwarg?
+ status = args[0] if len(args) else kwargs.get('status', None)
+ # no 'status' or cls is subclass already, return 'cls' instance
+ if not status or cls != NotmuchError:
+ return super(NotmuchError, cls).__new__(cls)
+ subclass = cls.get_exc_subclass(status) # which class to use?
+ return subclass.__new__(subclass, *args, **kwargs)