Source Code for Module rdfalchemy.orm

 1  #!/usr/bin/env python 
 2  # encoding: utf-8 
 3  """ 
 4  orm.py 
 5   
 6  Created by Philip Cooper on 2007-11-23. 
 7  Copyright (c) 2007 Openvest. All rights reserved. 
 8  """ 
 9   
10  from rdfalchemy.rdfSubject import rdfSubject 
11  from rdfalchemy.descriptors import rdfAbstract 
12   
13  import logging 
14  log=logging.getLogger(__name__) 
15   
16 -def allsub(cl, beenthere = set([])): 
17      "return all subclasses of the given class" 
18      sub = set(cl.__subclasses__()) | beenthere 
19      newsubs = set(cl.__subclasses__()) - beenthere 
20      for onesub in newsubs: 
21          sub |= allsub(onesub, sub) 
22      return sub 
23       
24   
25 -def mapper(*classes): 
26      """Map the classes given to allow descriptors with ranges to the proper Class of that type 
27      default if no args is to map all subclasses(recursivly) of rdfSubject 
28       
29      preforms the mapping 
30       
31      returns a dict of {rdf_type: mapped_class} for further processing""" 
32      if not classes: 
33          classes = allsub(rdfSubject) 
34      class_dict = dict([(str(cl.rdf_type), cl) for cl in classes]) 
35      for cl in classes:  # for each class 
36          for v in cl.__dict__.values():  # for each desciptor 
37              if isinstance(v,rdfAbstract) and v.range_type:  #if its a descriptor with a range 
38                  try: 
39                      v._mappedClass = class_dict[str(v.range_type)]  
40                  except KeyError: 
41                      log.warn("No Class Found\nFailed to map %s range of %s"%(v,v.range_type)) 
42      return class_dict 
43   
44  #def mapBase(baseclass): 
45  #    """This maps all classes below baseclass as in mapper() 
46  #    AND puts the dict of {rdf_type: mapped_class}  in an baseclass._type2class attribute""" 
47  #    baseclass._type2class = mapper(*allsub(baseclass)) 
48