from sfa.util.faults import *
from sfa.util.sfalogging import sfa_logger
-# for convenience and smoother translation
-def get_leaf(hrn): return Xrn(hrn=hrn,type='any').get_leaf()
-def get_authority(hrn): return Xrn(hrn=hrn,type='any').get_authority_hrn()
-def urn_to_hrn(urn): xrn=Xrn(urn=urn); return (xrn.hrn, xrn.type)
+# for convenience and smoother translation - we should get rid of these functions eventually
+def get_leaf(hrn): return Xrn(xrn=hrn).get_leaf()
+def get_authority(hrn): return Xrn(xrn=hrn).get_authority_hrn()
+def urn_to_hrn(urn): xrn=Xrn(xrn=urn); return (xrn.hrn, xrn.type)
def hrn_to_urn(hrn,type): return Xrn(hrn=hrn, type=type).urn
class Xrn:
@staticmethod
def hrn_leaf(hrn): return Xrn.hrn_split(hrn)[-1]
- # e.g. hrn_path_list ('a\.b.c.d') -> ['a\.b', 'c']
+ # e.g. hrn_auth_list ('a\.b.c.d') -> ['a\.b', 'c']
@staticmethod
- def hrn_path_list(hrn): return Xrn.hrn_split(hrn)[0:-1]
+ def hrn_auth_list(hrn): return Xrn.hrn_split(hrn)[0:-1]
- # e.g. hrn_path ('a\.b.c.d') -> 'a\.b.c'
+ # e.g. hrn_auth ('a\.b.c.d') -> 'a\.b.c'
@staticmethod
- def hrn_path(hrn): return '.'.join(Xrn.hrn_path_list(hrn))
+ def hrn_auth(hrn): return '.'.join(Xrn.hrn_auth_list(hrn))
# e.g. escape ('a.b') -> 'a\.b'
@staticmethod
def urn_split (urn):
return Xrn.urn_meaningful(urn).split('+')
+ ####################
+ # the local fields that are kept consistent
+ # self.urn
+ # self.hrn
+ # self.type
+ # self.path
# provide either urn, or (hrn + type)
- def __init__ (self, urn=None, hrn=None, type=None):
- if urn:
+ def __init__ (self, xrn=None, urn=None, hrn=None, type=None):
+ # user has specified xrn : guess if urn or hrn
+ if xrn is not None:
+ if xrn.startswith(Xrn.URN_PREFIX):
+ self.urn=xrn
+ self.urn_to_hrn()
+ else:
+ self.hrn=xrn
+ self.type=type
+ self.hrn_to_urn()
+ # user has specified urn, let's use it
+ elif urn is not None:
self.urn=urn
self.urn_to_hrn()
- elif hrn and type:
+ # user has specified hrn and type
+ elif hrn is not None and type is not None:
self.hrn=hrn
self.type=type
self.hrn_to_urn()
+ # what should we do ?
else:
raise SfaAPIError,"Xrn.__init__"
+# happens all the time ..
+# if not type:
+# sfa_logger().debug("type-less Xrn's are not safe")
def get_urn(self): return self.urn
- def get_hrn(self): return (self.hrn, self.type)
+ def get_hrn(self): return self.hrn
+ def get_type(self): return self.type
+ def get_hrn_type(self): return (self.hrn, self.type)
- def get_leaf(self):
- if not self.hrn: raise SfaAPIError, "Xrn.get_leaf"
+ def _normalize(self):
+ if self.hrn is None: raise SfaAPIError, "Xrn._normalize"
if not hasattr(self,'leaf'):
self.leaf=Xrn.hrn_split(self.hrn)[-1]
+ # self.authority keeps a list
+ if not hasattr(self,'authority'):
+ self.authority=Xrn.hrn_auth_list(self.hrn)
+
+ def get_leaf(self):
+ self._normalize()
return self.leaf
def get_authority_hrn(self):
- if not self.hrn: raise SfaAPIError, "Xrn.get_authority_hrn"
- # self.authority keeps a list
- if not hasattr(self,'authority'):
- self.authority=Xrn.hrn_path_list(self.hrn)
+ self._normalize()
return '.'.join( self.authority )
def get_authority_urn(self):
- if not self.hrn: raise SfaAPIError, "Xrn.get_authority_urn"
- # self.authority keeps a list
- if not hasattr(self,'authority'):
- self.authority=Xrn.hrn_path_list(self.hrn)
+ self._normalize()
return ':'.join( [Xrn.unescape(x) for x in self.authority] )
def urn_to_hrn(self):
compute tuple (hrn, type) from urn
"""
- if not self.urn or not self.urn.startswith(Xrn.URN_PREFIX):
+# if not self.urn or not self.urn.startswith(Xrn.URN_PREFIX):
+ if not self.urn.startswith(Xrn.URN_PREFIX):
raise SfaAPIError, "Xrn.urn_to_hrn"
parts = Xrn.urn_split(self.urn)
compute urn from (hrn, type)
"""
- if not self.hrn or self.hrn.startswith(Xrn.URN_PREFIX):
- raise SfaAPIError, "Xrn.hrn_to_urn"
+# if not self.hrn or self.hrn.startswith(Xrn.URN_PREFIX):
+ if self.hrn.startswith(Xrn.URN_PREFIX):
+ raise SfaAPIError, "Xrn.hrn_to_urn, hrn=%s"%self.hrn
if self.type == 'authority':
self.authority = Xrn.hrn_split(self.hrn)
name = 'sa'
else:
- self.authority = Xrn.hrn_path_list(self.hrn)
+ self.authority = Xrn.hrn_auth_list(self.hrn)
name = Xrn.hrn_leaf(self.hrn)
authority_string = self.get_authority_urn()