Viewing file:  Container.py (2.39 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
########################################################################
# $Header: /var/local/cvsroot/4Suite/Ft/Rdf/Container.py,v 1.4 2005/02/26 01:18:34 jkloth Exp $
"""
Classes for RDF Container objects
Copyright 2004 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
from Ft.Rdf import RDF_MS_BASE, RdfException
from Ft.Rdf.Resource import Resource
class Container(Resource, list):
"""
Base class for Bag, Sequence, and Alternative,
as defined in sec. 3.1 of the 1999 RDF Model and Syntax Spec.
"""
def __init__(self, className, uri=None, contents=None):
#if uri == None:
# uri = model.generateUri()
contents = contents or []
Resource.__init__(self, uri)
list.__init__(self, contents)
self.className = className
return
def __repr__(self):
st = '<%s at %s URI="%s": '%(self.className, id(self),self.uri)
if len(self) < 1:
st += 'empty'
else:
st += '[%s]' % ', '.join([i for i in self])
st += '>'
return st
def append(self, obj):
if not isinstance(obj, (str, unicode)):
raise RdfException(RdfException.INVALID_CONTAINER_ITEM_TYPE, obj)
else:
return list.append(self, obj)
class Bag(Container):
"""
An unordered list of resources or literals,
as defined in sec. 3.1 of the 1999 RDF Model and Syntax Spec.
"""
def __init__(self, uri=None, contents=None):
return Container.__init__(self, 'Bag', uri, contents)
class Sequence(Container):
"""
An ordered list of resources or literals,
as defined in sec. 3.1 of the 1999 RDF Model and Syntax Spec.
"""
def __init__(self, uri=None, contents=None):
return Container.__init__(self, 'Seq', uri, contents)
class Alternative(Container):
"""
A list of resources or literals that represent alternatives
for the (single) value of a property,
as defined in sec. 3.1 of the 1999 RDF Model and Syntax Spec.
"""
def __init__(self, uri=None, contents=None):
return Container.__init__(self, 'Alt', uri, contents)
baseLength = len(RDF_MS_BASE + '_')
def SortStatements(left, right):
leftCtr = int(left.predicate[baseLength:])
rightCtr = int(right.predicate[baseLength:])
return cmp(leftCtr, rightCtr)
|