Source Code for Module ndg.xacml.core.functions.v1.equal

 1  """NDG XACML equal function module - contains classes to represent XACML 1.0 
 2  *-equal functions 
 3   
 4  NERC DataGrid 
 5  """ 
 6  __author__ = "P J Kershaw" 
 7  __date__ = "26/03/10" 
 8  __copyright__ = "" 
 9  __license__ = "BSD - see LICENSE file in top-level directory" 
10  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
11  __revision__ = '$Id: equal.py 7955 2011-12-21 18:29:45Z rwilkinson $' 
12  from ndg.xacml.core.context.exceptions import XacmlContextTypeError 
13  from ndg.xacml.core.functions import AbstractFunction, FunctionClassFactoryBase 
14   
15   
16 -class EqualBase(AbstractFunction): 
17      """Generic equal function for all types 
18       
19      @cvar TYPE: attribute type for the given implementation.  Derived classes 
20      should set appropriately 
21      @type TYPE: NoneType 
22      """ 
23      TYPE = None 
24       
25 -    def evaluate(self, attribute1, attribute2): 
26          """Match input attribute values 
27           
28          @param attribute1: first of two attributes to match 
29          @type attribute1: ndg.xacml.core.attributevalue.AttributeValue derived 
30          @param attribute2: second attribute 
31          @type attribute2: ndg.xacml.core.attributevalue.AttributeValue derived 
32          @return: True if attributes match, False otherwise 
33          @rtype: bool 
34          """ 
35          if not isinstance(attribute1, self.__class__.TYPE): 
36              raise XacmlContextTypeError('Expecting %r derived type for ' 
37                                          '"attribute1"; got %r' % 
38                                          (self.__class__.TYPE,  
39                                           type(attribute1))) 
40               
41          if not isinstance(attribute2, self.__class__.TYPE): 
42              raise XacmlContextTypeError('Expecting %r derived type for ' 
43                                          '"attribute2"; got %r' % 
44                                          (self.__class__.TYPE,  
45                                           type(attribute2))) 
46               
47          return attribute1.value == attribute2.value 
48       
49   
50 -class FunctionClassFactory(FunctionClassFactoryBase): 
51      """Class Factory for *-equal XACML function classes 
52       
53      @cvar FUNCTION_NAMES: equal function URNs 
54      @type FUNCTION_NAMES: tuple 
55       
56      @cvar FUNCTION_NS_SUFFIX: generic suffix for equal function URNs 
57      @type FUNCTION_NS_SUFFIX: string 
58       
59      @cvar FUNCTION_BASE_CLASS: base class for all equal function classes 
60      @type FUNCTION_BASE_CLASS: ndg.xacml.core.functions.v1.EqualBase 
61      """ 
62      FUNCTION_NAMES = ( 
63          'urn:oasis:names:tc:xacml:1.0:function:string-equal', 
64          'urn:oasis:names:tc:xacml:1.0:function:boolean-equal', 
65          'urn:oasis:names:tc:xacml:1.0:function:integer-equal', 
66          'urn:oasis:names:tc:xacml:1.0:function:double-equal', 
67          'urn:oasis:names:tc:xacml:1.0:function:date-equal', 
68          'urn:oasis:names:tc:xacml:1.0:function:time-equal', 
69          'urn:oasis:names:tc:xacml:1.0:function:dateTime-equal', 
70          'urn:oasis:names:tc:xacml:1.0:function:dayTimeDuration-equal', 
71          'urn:oasis:names:tc:xacml:1.0:function:yearMonthDuration-equal', 
72          'urn:oasis:names:tc:xacml:1.0:function:anyURI-equal', 
73          'urn:oasis:names:tc:xacml:1.0:function:x500Name-equal', 
74          'urn:oasis:names:tc:xacml:1.0:function:rfc822Name-equal', 
75          'urn:oasis:names:tc:xacml:1.0:function:hexBinary-equal', 
76          'urn:oasis:names:tc:xacml:1.0:function:base64Binary-equal', 
77          'urn:oasis:names:tc:xacml:1.0:function:xpath-node-equal' 
78      ) 
79      FUNCTION_NS_SUFFIX = '-equal' 
80      FUNCTION_BASE_CLASS = EqualBase 
81