#!/bin/env python

print "==== Example 6 - RDQL query / bound variable results"
print "==== Get the titles of the books"

import joseki
import sys

from joseki import JosekiRequest
from rdflib.URIRef import URIRef
from rdflib.Namespace import Namespace
from resultset import ResultSet, ResultBinding


# A better name for the "wildcard" in a triple match
ANY = None

# Declare constants: better to use namespaces
DC = Namespace("http://purl.org/dc/elements/1.1/")
dcTitle = DC['title']

# The target model URL
# This is the Joseki online demo
modelURL = "http://jena.hpl.hp.com:2020/books"
if len(sys.argv) > 1:
    modelURL = sys.argv[1]
    print "Data source =", modelURL

book1 = URIRef("http://example.org/book/book1")
book2 = URIRef("http://example.org/book/book2")
book3 = URIRef("http://example.org/book/book3")
book4 = URIRef("http://example.org/book/book4")
book5 = URIRef("http://example.org/book/book5")

# ----------------------------------------

rdql="SELECT ?book, ?title WHERE "+\
        "(?book <http://purl.org/dc/elements/1.1/title> ?title)"

BV="http://jena.hpl.hp.com/2003/07/query/BV"
#BV="BV"

store = joseki.query(modelURL, "RDQL", q=rdql, format=BV)
store.prefix_mapping("rs", "http://jena.hpl.hp.com/2003/03/result-set#")
## print
## store.output(sys.stdout)
## print

resultSet = ResultSet(store)

for rb in resultSet.iter():
    vBook = rb["book"]
    vTitle = rb["title"]
    print vBook,"  has title"
    print "    '%s'" % vTitle