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https://issues.apache.org/jira/browse/JENA-2290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne resolved JENA-2290.
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Resolution: Fixed
> GraphRDFS doesn't implement contains
> ------------------------------------
>
> Key: JENA-2290
> URL: https://issues.apache.org/jira/browse/JENA-2290
> Project: Apache Jena
> Issue Type: Bug
> Components: Core
> Affects Versions: Jena 4.4.0
> Reporter: Lorenz Bühmann
> Assignee: Andy Seaborne
> Priority: Major
> Fix For: Jena 4.5.0
>
>
> While trying to use the RDFS dataset to use light-weight reasoning I
> recognized that the contains method isn't implemented properly?
> I can't say if this holds for all contains calls as there is some contains
> method directly in the dataset.
> But the following path is what I got trouble with:
> Given {{D}} being a {{DatasetGraphRDFS}} and then getting the named model
> {{M}} for a particular graph which in fact is then backed by a {{GraphRDFS}}
> instance {{G}} this {{G}} doesn't seem to make use of the inferred triples
> when we call {{{}contains{}}}. This method is still only implemented in the
> {{GraphWrapper}} superclass and doesn't make use of the overridden {{find}}
> method.
> Don't what would be best place to implement it. Sure, we could make use of
> {{find}} directly in the {{GraphRDFS}} class, e.g.
> {code:java}
> @Override
> public boolean contains(Node s, Node p, Node o) {
> return find(s, p, o).hasNext();
> }
> @Override
> public boolean contains(Triple t) {
> return contains(t.getSubject(), t.getPredicate(), t.getObject());
> } {code}
> But I'm wondering about efficiency as I don't know how efficient the
> inference streams are built. I mean we could maybe terminate way earlier in
> the {{MatchRDFS}} but it would of course lead to some more lines of code.
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