Source Code for Module ndg.xacml.parsers.etree.attributedesignatorreader

 1  """NDG XACML ElementTree based reader for AttributeDesignator type 
 2   
 3  NERC DataGrid 
 4  """ 
 5  __author__ = "P J Kershaw" 
 6  __date__ = "16/03/10" 
 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: attributedesignatorreader.py 7109 2010-06-28 12:54:57Z pjkersha $" 
12  from ndg.xacml.utils import str2Bool 
13  from ndg.xacml.parsers import XMLParseError 
14  from ndg.xacml.parsers.etree import QName 
15  from ndg.xacml.parsers.etree.expressionreader import ExpressionReader 
16   
17   
18 -class AttributeDesignatorReaderBase(ExpressionReader): 
19      '''ElementTree based XACML Attribute Designator base class type parser 
20      ''' 
21 -    def _parseExtension(self, elem, attributeDesignator): 
22          """Parse Attribute Designator element 
23           
24          @param elem: ElementTree XML element 
25          @type elem: xml.etree.Element 
26           
27          @param attributeDesignator: attribute designator 
28          @type attributeDesignator: ndg.xacml.core.attributedesignator.AttributeDesignator 
29           
30          @raise XMLParseError: error parsing attribute ID XML attribute 
31           
32          @return: updated attribute designator 
33          @rtype: ndg.xacml.core.attributedesignator.AttributeDesignator 
34          """ 
35          xacmlType = self.__class__.TYPE 
36           
37          # Unpack additional *required* attributes from top-level element 
38          attributeValues = [] 
39          for attributeName in (xacmlType.ATTRIBUTE_ID_ATTRIB_NAME,): 
40              attributeValue = elem.attrib.get(attributeName) 
41              if attributeValue is None: 
42                  raise XMLParseError('No "%s" attribute found in "%s" element' % 
43                                      (attributeName,  
44                                       xacmlType.ELEMENT_LOCAL_NAME)) 
45                   
46              attributeValues.append(attributeValue) 
47                
48          attributeDesignator.attributeId, = attributeValues 
49                 
50          # Optional attributes 
51          issuer = elem.attrib.get(xacmlType.ISSUER_ATTRIB_NAME) 
52          if issuer is not None: 
53              attributeDesignator.issuer = issuer 
54                
55          mustBePresent = elem.attrib.get(xacmlType.MUST_BE_PRESENT_ATTRIB_NAME) 
56          if mustBePresent is not None: 
57              attributeDesignator.mustBePresent = str2Bool(mustBePresent) 
58      
59          return attributeDesignator 
60