[jira] Created: (CLEREZZA-276) adding a language to an empty list throws an exception

["Hasan (JIRA)" <ji...@apache.org>]

adding a language to an empty list throws an exception
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                 Key: CLEREZZA-276
                 URL: https://issues.apache.org/jira/browse/CLEREZZA-276
             Project: Clerezza
          Issue Type: Bug
            Reporter: Hasan


if the platform language list is empty, for example through removing existing ones, then an exception will be thrown (java.util.NoSuchElementException) when trying to add a language

this.code in bundle activation throws the abovementioned error
        final RdfList rdfList = new RdfList(this.getLanguageListNode(), systemGraph);
        rdfList.remove(new UriRef(this.lingvoj + "en")); // now list is empty
        this.languageService.addLanguage(new UriRef(this.lingvoj + "de"));

where getLanguageListNode is:
    private NonLiteral getLanguageListNode() {
        Iterator<Triple> instances = systemGraph.filter(null, RDF.type, PLATFORM.Instance);
        if (!instances.hasNext()) {
            throw new RuntimeException("No Platform:Instance in system graph.");
        }
        NonLiteral instance = instances.next().getSubject();
        Iterator<Triple> langListIter = systemGraph.filter(instance,
                PLATFORM.languages, null);
        if (langListIter.hasNext()) {
            return (NonLiteral) langListIter.next().getObject();
        }
        BNode listNode = new BNode();
        systemGraph.add(new TripleImpl(instance, PLATFORM.languages,
                listNode));
        return listNode;
    }


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