I'm sorry for the inconvenience, it was a mistake on my end.
Apparently " model.listStatements.hasNext() " does seem to test correctly if a
model is empty.
> Op 2-mrt.-2015, om 18:04 heeft Martynas Jusevičius <marty...@graphity.org>
> het volgende geschreven:
>
> What's the query code? You are probably querying from an inferencing
> model that imports example.com ontology.
>
> On Mon, Mar 2, 2015 at 4:58 PM, Maarten van Dessel
> <maartenvandes...@hotmail.com> wrote:
>> Hi everyone,
>>
>> I'm using construct queries in a project. I want to make decisions based on
>> wether the constructed model contains any data. Is there any way on how this
>> can be known?
>>
>> Example query:
>> CONSTRUCT
>> { ?person <http://example.com#hasStatus> <http://example.com#Occupied> .}
>> WHERE
>> { ?person <http://example.com#hasStatus> <http://example.com#Free> .}
>>
>> Printing the resulting model (which seems empty):
>> <rdf:RDF
>> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
>> xmlns:owl="http://www.w3.org/2002/07/owl#";
>> xmlns:example="http://example.com#";
>> xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#";
>> xmlns:xsd="http://www.w3.org/2001/XMLSchema#"; >
>> </rdf:RDF>
>>
>> My attempt to check wether a model is empty:
>> StmtIterator nodeIterator = model.listStatements();
>> if (nodeIterator.hasNext()) {
>> // do something
>> }
>>
>> This however doesn't work, since there are still triples returned in the
>> iterator:
>> [http://example.com#hasStatus,
>> http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
>> http://www.w3.org/2002/07/owl#ObjectProperty]
>>
>> Any thoughts are appreciated.
>>
>> Thanks,
>>
>> Maarten
