Source Code for Module ndg.xacml.core.context.exceptions

 1  """NDG XACML exception types for the context package 
 2   
 3  NERC DataGrid 
 4  """ 
 5  __author__ = "P J Kershaw" 
 6  __date__ = "01/04/10" 
 7  __copyright__ = "(C) 2010 Science and Technology Facilities Council" 
 8  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
 9  __license__ = "BSD - see LICENSE file in top-level directory" 
10  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
11  __revision__ = "$Id: exceptions.py 7087 2010-06-25 11:23:09Z pjkersha $" 
12  from ndg.xacml.core.context.response import Response 
13  from ndg.xacml.core.context.result import Result, Decision, StatusCode 
14   
15   
16 -class XacmlContextError(Exception):     
17      """Base class for exceptions related XACML context handling 
18       
19      @ivar __response: Context response object associated with this exception 
20      @type __response: ndg.xacml.core.context.response.Response 
21      """ 
22       
23 -    def __init__(self, *arg, **kw): 
24          """Override Exception base class so as to add the response object in 
25          the exception instance 
26           
27          @param arg: base class arguments 
28          @type arg: tuple 
29          @param kw: base class keywords if any 
30          @type kw: dict 
31          """ 
32          super(XacmlContextError, self).__init__(*arg, **kw) 
33          self.__response = Response() 
34          self.__response.results.append(Result.createInitialised()) 
35           
36          self.__response.results[0].decision = Decision.INDETERMINATE 
37          if len(arg) > 0: 
38              self.__response.results[0].status.statusMessage = arg[0] 
39           
40      @property 
41 -    def response(self): 
42          """ 
43          @return: Context response object associated with this exception 
44          @rtype: ndg.xacml.core.context.response.Response 
45          """ 
46          return self.__response 
47       
48      @response.setter 
49 -    def response(self, value): 
50          if not isinstance(value, Response): 
51              raise TypeError('Expecting %r type for "response" attribute; got ' 
52                              '%r instead' % (Response, type(Response))) 
53          self.__response = value 
54   
55   
56 -class XacmlContextTypeError(XacmlContextError): 
57      """Type errors within XACML context processing""" 
58               
59           
60 -class MissingAttributeError(XacmlContextError): 
61      """AttributeDesignator or AttributeSelector has specified MustBePresent 
62      but the request context contains no match for required attribute XPath 
63      respectively 
64      """ 
65