Source Code for Module advene.model.backends.exceptions

 1  # backend related exceptions 
 2   
 3 -class WrongFormat(Exception): 
 4      """ 
 5      I am raised whenever a backend is badly formatted. 
 6      """ 
 7      pass 
 8   
 9 -class NoSuchPackage(Exception): 
10      """ 
11      I am raised whenever a backend is required for an inexisting package. 
12      """ 
13      pass 
14   
15 -class PackageInUse(Exception): 
16      """ 
17      I am raised whenever an attempt is made to bind a Package instance to a 
18      backend already bound, or to create an existing (bound or not) Package. 
19      The message can either be the other Package instance, if available, or the 
20      package backend url. 
21      """ 
22 -    def __str__ (self): 
23          if isinstance(self.message, basestring): 
24              return self.message 
25          else: 
26              return self.message._id # a package instance 
27      pass 
28   
29 -class InternalError(Exception): 
30      """I am raised whenever a backend encounters an internal error. 
31   
32      I wrap the original exception, if any, as my second argument. 
33      """ 
34 -    def __init__(self, msg, original_exception=None, *args): 
35          self.args = (msg, original_exception) + args 
36 -    def __str__(self): 
37          return "%s\nOriginal message:\n%s" % self.args[:2] 
38   
39  # utility class 
40   
41 -class ClaimFailure(object): 
42      """Failure code of a claims_for_* method. 
43   
44      A ClaimFailure always has a False truth value. Furthermore, it has an 
45      ``exception`` attribute containing, if not None, an exception explaining 
46      the failure. 
47      """ 
48   
49 -    def __init__(self, exception=None): 
50          self.exception = exception 
51   
52 -    def __nonzero__(self): 
53          return False 
54   
55 -    def __repr__(self): 
56          return "ClaimFailure(%r)" % self.exception 
57