> Hello!
>
> I have an application, which creates an individual called batch. A batch has
> a list of company IDs (strings). Add the property like this:
>
> open fun addCompanyIdsList(
> batch: Resource,
> companyIds: List<String>,
> model: Model) {
> val prop = model.createProperty(Bp2BatchCompanyIds)
> val list = model.createList()
> companyIds
> .filter { it.isNumeric() }
> .map { it.toInt() }
> .map { id -> model.createTypedLiteral(id) }
> .forEach { literal -> list.add(literal) }
> batch.addProperty(prop, list)
> }
>
> In another operation I want to remove the first element of the list so that
> this change is saved in Jena. For primitive data types like integers, there
> is the method
>
> org.apache.jena.rdf.model.Statement#changeLiteralObject(boolean)
>
> and its analogs.
>
> How do I change the list? Is it sufficient to just remove an element from the
> list like in the code snippet below?
>
> ds.begin(ReadWrite.WRITE)
> val query = createQuery("""SELECT ?x
> WHERE { ?x $Bp2BatchNumber
> $batchId }""")
> val qexec = createQueryExecution(ds, query)
> val rs = qexec.execSelect()
> val sol = rs.nextSolution()
> val rec = sol["x"]
> val prop = findStatement(Bp2BatchCompanyIds, rec as Resource)
> val companyIds = prop.`object` as RDFList
> val head = companyIds.head
> companyIds.remove(result)
> ds.end()
Which programming language is this?
Does your code compile? I'm asking because there is just a getHead()
method on an RDFList object. And this one returns an RDFNode object,
thus, remove should be impossible here.
> Thanks in advance
>
> Dmitri Pisarenko
>
--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center
