[jira] [Commented] (JENA-1855) TRIG parser yields NULL-graph for quads in default graph

[Andy Seaborne (Jira)]

    [ 
https://issues.apache.org/jira/browse/JENA-1855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17055969#comment-17055969
 ] 

Andy Seaborne commented on JENA-1855:
-------------------------------------

Creates JENA-1857 for the {{.size()}} issue.

Test examples for this issue: the two ways to get raw parser output show the 
problem.
It looks like (to me, ATM) that {{LangTriG}} needs a simple fix and that NQ 
parsing is correct.

{code:java}
    public static void main(String...a) {
        // One triple, default graph.
        dwim("/home/afs/tmp/D.trig");
        dwim("/home/afs/tmp/D.nq");
    }

    public static void dwim(String dataFilename) {
        System.out.println("== Data: "+dataFilename);
        System.out.println();

        // NQ: urn:x-arq:DefaultGraphNode
        // TriG: null
        {
            System.out.println("RDFDataMgr.createIteratorQuads");
            Lang lang = RDFLanguages.filenameToLang(dataFilename);
            Iterator<Quad> it = 
RDFDataMgr.createIteratorQuads(IO.openFile(dataFilename), lang, null);
            while (it.hasNext()) {
                Quad q = it.next();
                System.out.println(q.getGraph());
            }
            System.out.println();
        }

        // NQ: urn:x-arq:DefaultGraphNode
        // TriG: null
        {
            System.out.println("RDFDataMgr.parse");
            StreamRDF dest = new StreamRDFBase() {
                @Override
                public void quad(Quad quad) {
                    System.out.println(quad.getGraph());
                }
            };
            RDFDataMgr.parse(dest, dataFilename);
            System.out.println();
        }
    }
{code}

> TRIG parser yields NULL-graph for quads in default graph
> --------------------------------------------------------
>
>                 Key: JENA-1855
>                 URL: https://issues.apache.org/jira/browse/JENA-1855
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: RIOT
>    Affects Versions: Jena 3.14.0
>            Reporter: Claus Stadler
>            Assignee: Andy Seaborne
>            Priority: Major
>
> Hi Jena Team and Andy, thanks for all your great work on Jena and fixing all 
> my recent issues, but I found another one :)
> The Trig Parser yields quads with a null value in the graph component for 
> data in the default graph. It should be Quad.defaultGraphNodeGenerated.
> Test data:
> {code}
> # test.trig
> @base <http://www.example.org/base-> .
> @prefix : <http://www.example.org/prefx-> .
> <s> <p> <o> .
> :x :y :z .
> {code}
> {code:java}
> Iterator<Quad> it = 
> RDFDataMgr.createIteratorQuads(RDFDataMgr.open("test.trig"), Lang.TRIG, null);
> while(it.hasNext()) {
>       Quad q = it.next();
>       System.out.println(q.getGraph());
> }
> {code}
> {code}
> null
> null
> {code}
> This causes quite unexpected null pointer exceptions, such as in this simple 
> scenario:
> {code}                
> Dataset ds = RDFDataMgr.loadDataset("test.trig");
> System.out.println(ds.asDatasetGraph().size());
> {code}



--
This message was sent by Atlassian Jira
(v8.3.4#803005)