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'''
Created on Jun 24, 2010
@author: leifj
'''
from django.db import models
from django.contrib.auth.models import User
import re
class Attribute(models.Model):
name = models.CharField(unique=True,max_length=255)
description = models.TextField(blank=True)
timecreated = models.DateTimeField(auto_now_add=True)
lastupdated = models.DateTimeField(auto_now=True)
def __unicode__(self):
return self.name;
class Name(models.Model):
'''
A name-space/authorization/right/group/collaboration/thing
'''
type = models.ForeignKey(Attribute, blank=True, null=True,related_name='names')
value = models.CharField(max_length=255)
parent = models.ForeignKey('self', blank=True, null=True,related_name='children')
partof = models.ForeignKey('self', blank=True, null=True,related_name='parts')
acl = models.TextField(blank=True) # fully-qualified-name '#' rights
description = models.TextField(blank=True)
creator = models.ForeignKey(User)
timecreated = models.DateTimeField(auto_now_add=True)
lastupdated = models.DateTimeField(auto_now=True)
def relative_name(self):
if self.type:
return "%s=%s" % (self.type.name,self.value)
else:
return self.value
def __unicode__(self):
n = self
str = ""
while n:
sep = ""
av = n.relative_name()
if n.parent:
if av.find("=") == -1:
sep = ':'
else:
sep = ';'
str = sep+av+str
n = n.parent
return str
def walkto(root,nameparts):
name = None
for n in nameparts:
(a,eq,v) = n.partition('=')
if v:
attribute = Attribute.objects.get(name=a)
name = Name.objects.get(parent=root,type=attribute.id,value=v)
else:
name = Name.objects.get(parent=root,type=None,value=a)
return name
def lookup(name):
return walkto(None,nameparts=re.compile('[;:]').split(name))
def attribute(a):
Attribute.objects.get_or_create(name=a)
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