Frank,
Could you try this with the latest snapshot builds?
http://www.openjena.org/repo-dev/com/hp/hpl/jena/arq/
It might a manifestation of a recently fixed bug (ARQ, TDB).
If it persists, could you create a test case (wrap in something add the
data) and say what storage your are using for Dataset? In-memory? TDB? SDB?
Andy
On 02/02/11 06:03, Frank Budinsky wrote:
Thanks for your reply Andy. What I'm trying to do is replace a named graph
with a newer version. The way I do this is by first removing the old graph
and then I add the new one. It seems that the "removing the old version"
part is causing the problem. I added some debug code to the method like
this:
protected Resource addOrReplaceResource(Dataset dataset, String
resourceURI, InputStream instream)
{
Resource resource = dataset.containsNamedModel(resourceURI) ?
dataset.getNamedModel(resourceURI).getResource(resourceURI) : null;
if (resource != null) {
System.out.print("before remove: ");
for (Iterator iter = dataset.listNames(); iter.hasNext(); ) {
System.out.println(" " + iter.next());
}
dataset.asDatasetGraph().removeGraph(resource.asNode());
System.out.print("after remove: ");
for (Iterator iter = dataset.listNames(); iter.hasNext(); ) {
System.out.println(" " + iter.next());
}
}
Model model = dataset.getNamedModel(resourceURI);
model.read(instream, null);
resource = model.getResource(resourceURI);
return resource;
}
When I ran the code with
resourceURI="https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/20";,
I got this output:
before remove:
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/11
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/10
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/6
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/20
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/18
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/22
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/5
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/1
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/9
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/23
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/8
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/27
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/13
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/3
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/25
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/19
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/2
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/24
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/14
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/4
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/26
https://frankb-tp.torolab.ibm.com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/21
after remove:
Notice that there are no names being returned from dataset.listNames()
after the call to removeGraph(). I was expecting it to only have removed
"...WorkItem/20", but it seems to have removed all the graphs.
Any idea why this is happening? Am I using the wrong API for this?
Thanks,
Frank
Andy Seaborne<[email protected]> wrote on 02/01/2011 04:20:58
PM:
[image removed]
Re: Problem replacing graph
Andy Seaborne
to:
jena-users
02/01/2011 04:23 PM
Please respond to jena-users
On 01/02/11 14:47, Frank Budinsky wrote:
Hi All,
I'm having trouble doing a fairly straightforward operation in Jena,
which
probably just means I'm doing something wrong. I'm trying to add or
replace
a resource (as a graph) in my dataset. The code I wrote looks something
like this:
protected Resource addOrReplaceResource(Dataset dataset, String
resourceURI, InputStream instream)
{
Resource resource = dataset.containsNamedModel
(resourceURI) ?
dataset.getNamedModel(resourceURI).getResource
(resourceURI) : null;
if (resource != null)
dataset.asDatasetGraph().removeGraph(resource.asNode
());
Model model = dataset.getNamedModel(resourceURI);
model.read(instream, null);
resource = model.getResource(resourceURI);
return resource;
}
When a resourceURI is added for the first time, it works fine but when
replacing a graph the call to removeGraph() seems to wipe out the
entire
dataset. The only thing left in the dataset after that is the single
resource which gets added after the removeGraph call.
resources aren't added by getResource - in fact, it does not change the
model and and RDF model does not have resources without being in a
statement.
Is there something obvious that I'm doing wrong here?
Thanks,
Frank.
removeGraph(String) removes the graph (all the statements).
Then it depends what's in the RDF/XML in instream.
What happens if you print the model, or print the dataset, just before
the return?
Andy
