On 6/29/2012 8:08, Martynas Jusevicius wrote:
Holger,
I've built a QueryBuilder class as part of Graphity:
https://github.com/Graphity/graphity-browser/blob/master/src/main/java/org/graphity/util/QueryBuilder.java
I think it could be useful for many working with Jena and/or SPIN
queries, but I lack expertise of SPIN API to make it robust.
I cannot tell why the removeAll would not work - it looks correct to me
(except that you leave orphan bnodes hanging around). But I do not
understand why you create another bnode with sp:expression and then wrap
this into a list - why not use the Variable directly in line 234/5.
Overall the result should be triples like
[ a sp:Select ;
sp:orderBy ([ sp:varName "a"^^xsd:string
]) ;
I still believe it may be easier to go with a new Jena Query object each
time and do the manipulation there.
Cheers
Holger
Here's where I use it:
https://github.com/Graphity/graphity-browser/blob/master/src/main/java/org/graphity/browser/Resource.java
Could you help me out with this?
Martynas
graphity.org
On Wednesday, June 27, 2012 2:15:55 AM UTC+2, Holger Knublauch wrote:
On 6/26/2012 20:26, Martynas wrote:
Holger,
I have a SPIN query for which I want to change the ORDER BY
expression -- say change the ?var name, or change ASC to DESC for
example.
I have implemented the following method:
public QueryBuilder orderBy(Variable var, boolean desc)
{
spinQuery.removeAll(SP.orderBy); // does not have effect??
If not, then are you perhaps in a MultiUnion graph where the
triple is not in the base graph? Also note that the removeAll
won't delete any rdf:List triples, so they may be left as orphans.
Hard to say without the full source code.
In general, have you thought about using the Jena Query model API
instead here, i.e. manipulate the Jena objects and then use
ARQ2SPIN to replace the bnodes of the select?
Holger
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