Viewing file:  Resource.py (1.63 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
from rdflib import URIRef, BNode
from Util import ListRedirect
from sets import Set
class RDFTerm(object):
"""
Common class for RDF terms
"""
class Resource(RDFTerm):
"""
Represents a sigle resource in a triple pattern. It consists of an identifier
(URIReff or BNode) and a list of rdflib.sparql.bison.Triples.PropertyValue instances
"""
def __init__(self,identifier=None,propertyValueList=None):
self.identifier = identifier is not None and identifier or BNode()
self.propVals = propertyValueList is not None and propertyValueList or []
def __repr__(self):
resId = isinstance(self.identifier,BNode) and '_:'+self.identifier or self.identifier
#print type(self.identifier)
return "%s%s"%(resId,self.propVals and ' %s'%self.propVals or '')
def extractPatterns(self) :
for prop,objs in self.propVals:
for obj in objs:
yield (self.identifier,prop,obj)
class TwiceReferencedBlankNode(RDFTerm):
"""
Represents BNode in triple patterns in this form:
[ :prop1 :val1 ] :prop2 :val2
"""
def __init__(self,props1,props2):
self.identifier = BNode()
self.propVals = list(Set(props1+props2))
class ParsedCollection(ListRedirect,RDFTerm):
"""
An RDF Collection
"""
reducable = False
def __init__(self,graphNodeList):
self.identifier = BNode()
self.propVals = []
self._list = graphNodeList
def setPropertyValueList(self,propertyValueList):
self.propVals = propertyValueList
def __repr__(self):
return "<RDF Collection: %s>"%self._list
|