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

 1  """NDG XACML ElementTree based reader for PolicyDefaults type 
 2   
 3  NERC DataGrid 
 4  """ 
 5  __author__ = "P J Kershaw" 
 6  __date__ = "18/03/10" 
 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: policydefaultsreader.py 7986 2012-01-13 11:39:34Z rwilkinson $" 
12  from ndg.xacml.core.policydefaults import PolicyDefaults 
13  from ndg.xacml.parsers import XMLParseError 
14  from ndg.xacml.parsers.etree import QName 
15  from ndg.xacml.parsers.etree.reader import ETreeAbstractReader 
16   
17   
18 -class PolicyDefaultsReader(ETreeAbstractReader): 
19      '''ElementTree based XACML PolicyDefaults type parser 
20       
21      @cvar TYPE: XACML class type that this reader will read values into 
22      @type TYPE: type 
23      ''' 
24      TYPE = PolicyDefaults 
25       
26 -    def __call__(self, obj, common): 
27          """Parse Policy defaults object 
28           
29          @param obj: input object to parse 
30          @type obj: ElementTree Element, or stream object 
31          @param common: parsing common data 
32          @type common: from ndg.xacml.parsers.common.Common 
33          @return: new XACML expression instance 
34          @rtype: ndg.xacml.core.policydefaults.PolicyDefaults derived type  
35          @raise XMLParseError: error reading element                
36          """ 
37          elem = super(PolicyDefaultsReader, self)._parse(obj) 
38           
39          xacmlType = self.__class__.TYPE 
40          policyDefaults = xacmlType() 
41           
42          localName = QName.getLocalPart(elem.tag) 
43          if localName != xacmlType.ELEMENT_LOCAL_NAME: 
44              raise XMLParseError("No \"%s\" element found" %  
45                                  xacmlType.ELEMENT_LOCAL_NAME) 
46           
47          if len(elem) != 1: 
48              raise XMLParseError('Expecting a single child element for ' 
49                                  'PolicyDefaults element') 
50               
51          if (QName.getLocalPart(elem[0].tag) !=  
52              xacmlType.XPATH_VERSION_ELEMENT_NAME): 
53              raise XMLParseError('Expecting a %r child element for ' 
54                                  'PolicyDefaults element' %  
55                                  xacmlType.XPATH_VERSION_ELEMENT_NAME) 
56           
57          xpathVersion = elem[0].text  
58          if xpathVersion is None: 
59              raise XMLParseError('No %r child element value set for ' 
60                                  'PolicyDefaults element' %  
61                                  xacmlType.XPATH_VERSION_ELEMENT_NAME)  
62                
63          policyDefaults.xpathVersion = xpathVersion 
64           
65          return policyDefaults 
66