huge cleanup for removing mutables used as default

[sfa.git] / sfa / util / xrn.py

diff --git a/sfa/util/xrn.py b/sfa/util/xrn.py
index 985b571..b16ea51 100644 (file)
--- a/sfa/util/xrn.py
+++ b/sfa/util/xrn.py
@@ -32,9 +32,6 @@ def urn_to_hrn(urn): xrn=Xrn(urn); return (xrn.hrn, xrn.type)
 def hrn_to_urn(hrn,type): return Xrn(hrn, type=type).urn
 def hrn_authfor_hrn(parenthrn, hrn): return Xrn.hrn_is_auth_for_hrn(parenthrn, hrn)
 
-def urn_to_sliver_id(urn, slice_id, node_id, index=0, authority=None):
-    return Xrn(urn).get_sliver_id(slice_id, node_id, index, authority)
-
 class Xrn:
 
     ########## basic tools on HRNs
@@ -112,6 +109,19 @@ class Xrn:
     def urn_split (urn):
         return Xrn.urn_meaningful(urn).split('+')
 
+    @staticmethod
+    def filter_type(urns=None, type=None):
+        if urns is None: urns=[]
+        urn_list = []
+        if not type:
+            return urns
+
+        for urn in urns:
+            xrn = Xrn(xrn=urn)
+            if (xrn.type == type):
+                # Xrn is probably a urn so we can just compare types  
+                urn_list.append(urn)
+        return urn_list
     ####################
     # the local fields that are kept consistent
     # self.urn
@@ -119,12 +129,15 @@ class Xrn:
     # self.type
     # self.path
     # provide either urn, or (hrn + type)
-    def __init__ (self, xrn, type=None):
+    def __init__ (self, xrn="", type=None, id=None):
         if not xrn: xrn = ""
         # user has specified xrn : guess if urn or hrn
+        self.id = id
         if Xrn.is_urn(xrn):
             self.hrn=None
             self.urn=xrn
+            if id:
+                self.urn = "%s:%s" % (self.urn, str(id))
             self.urn_to_hrn()
         else:
             self.urn=None
@@ -168,19 +181,29 @@ class Xrn:
         self._normalize()
         return ':'.join( [Xrn.unescape(x) for x in self.authority] )
 
-    def get_sliver_id(self, slice_id, node_id=None, index=0, authority=None):
+    def set_authority(self, authority):
+        """
+        update the authority section of an existing urn
+        """
+        authority_hrn = self.get_authority_hrn()
+        if not authority_hrn.startswith(authority):
+            hrn = ".".join([authority,authority_hrn, self.get_leaf()])
+        else:
+            hrn = ".".join([authority_hrn, self.get_leaf()])
+            
+        self.hrn = hrn 
+        self.hrn_to_urn()
         self._normalize()
-        urn = self.get_urn()
-        if authority:
-            authority_hrn = self.get_authority_hrn()
-            if not authority_hrn.startswith(authority):
-                hrn = ".".join([authority,authority_hrn, self.get_leaf()])
-            else:
-                hrn = ".".join([authority_hrn, self.get_leaf()])
-            urn = Xrn(hrn, self.get_type()).get_urn()
-        parts = [part for part in [urn, slice_id, node_id, index] if part is not None]
-        return ":".join(map(str, [parts]))
 
+    # sliver_id_parts is list that contains the sliver's 
+    # slice id and node id 
+    def get_sliver_id_parts(self):
+        sliver_id_parts = []
+        if self.type == 'sliver' or '-' in self.leaf:
+            sliver_id_parts = self.leaf.split('-')
+        return sliver_id_parts
+        
+        
     def urn_to_hrn(self):
         """
         compute tuple (hrn, type) from urn
@@ -210,6 +233,10 @@ class Xrn:
         hrn = '.'.join([Xrn.escape(part).replace(':','.') for part in parts if part])
         # dont replace ':' in the name section
         if name:
+            parts = name.split(':')
+            if len(parts) > 1:
+                self.id = ":".join(parts[1:])
+                name = parts[0]    
             hrn += '.%s' % Xrn.escape(name) 
 
         self.hrn=str(hrn)
@@ -245,7 +272,10 @@ class Xrn:
             urn = "+".join(['',authority_string,Xrn.unescape(name)])
         else:
             urn = "+".join(['',authority_string,self.type,Xrn.unescape(name)])
-        
+
+        if hasattr(self, 'id') and self.id:
+            urn = "%s:%s" % (urn, self.id)        
+
         self.urn = Xrn.URN_PREFIX + urn
 
     def dump_string(self):