Changeset 6746 for TI12-security/trunk/NDG_XACML/ndg/xacml/core/__init__.py

Timestamp:

16/03/10 13:26:59 (11 years ago)

Author:

pjkersha

Message:

Added more !ETree readers for the different types.

File:

• TI12-security/trunk/NDG_XACML/ndg/xacml/core/__init__.py (modified) (1 diff)

TI12-security/trunk/NDG_XACML/ndg/xacml/core/__init__.py

@@ -10 +10 @@
 __contact__ = "Philip.Kershaw@stfc.ac.uk"
 __revision__ = "$Id: $"
+    
+    
+class PolicyComponent(object):
+    """Base class for Policy and Policy subelements"""
+    XACML_2_0_XMLNS = "urn:oasis:names:tc:xacml:2.0:policy:schema:os"
+
+    __slots__ = ('__xmlns', '__reader', '__writer')
+
+    ELEMENT_LOCAL_NAME = None
+    
+    def __init__(self):
+        self.__xmlns = PolicyComponent.XACML_2_0_XMLNS
+        self.__reader = None
+        self.__writer = None
+        
+    def _getXmlns(self):
+        return self.__xmlns
+
+    def _setXmlns(self, value):
+        if not isinstance(value, basestring):
+            raise TypeError('Expecting string type for "xmlns" '
+                            'attribute; got %r' % type(value))
+        self.__xmlns = value
+
+    xmlns = property(_getXmlns, _setXmlns, 
+                     doc="XML Namespace for policy the document")
+    
+    @property
+    def isValidXmlns(self):
+        return self.xmlns in PolicyComponent.XMLNS
+
+    def read(self, obj):
+        """Read using callable assinged to reader property"""
+        if self.__reader is None:
+            raise AttributeError('No reader set for %r' % self.__class__)
+        
+        self.__reader(self, obj)
+
+    @classmethod
+    def Read(cls, obj):
+        """Construct a new Policy""" 
+        xacmlObj = cls()
+        xacmlObj.read(obj)
+        return xacmlObj
+    
+    def write(self, obj):
+        """Read using callable assinged to reader property"""
+        if self.__writer is None:
+            raise AttributeError('No writer set for %r' % self.__class__)
+        
+        self.__writer(self, obj)
+        
+            
+class RequestPropertyBase(PolicyComponent):
+    """Base type for Subject, Resource, Action and Environment types"""
+    MATCH_TYPE = None
+    
+    __slots__ = ('__matches', )
+    
+    def __init__(self):
+        # Derived types can specify the type for matches via the MATCH_TYPE
+        # class variable
+        self.__matches = TypedList(self.__class__.MATCH_TYPE)
+        
+    @property
+    def matches(self):
+        return self.__matches