something like
protected void writeRDFStatements( Model model, PrintWriter writer )
{
Set<Resource> subjects = new TreeSet<Resource>();
subjects.addAll( model.listSubjects().asSet() );
Iterator<Resource> rIter = subjects.iterator()
while (rIter.hasNext()) writeRDFStatements( model, rIter.nex(), writer );
}
Might do the trick, assuming that you want the statements in "natural"
order and that you don't have so many as to overflow memory.
If you want a different order you could implement a comparator and pass it
to the TreeSet constructor.
Claude
On Thu, Sep 12, 2013 at 8:09 AM, <[email protected]> wrote:
> Hi Claude,
>
> It's close as this code at least group the triples
> per subject basis and the "model.write(stream, lang)"
> prints out in that manner. Still, there's no explicit
> ordering in the subjects (other than the iterator's
> own implicit one). Looks like I need to write my own.
>
> Thanks
>
> Chan
>
>
> The code you are looking for is probably in
>> com.hp.hpl.jena.xmloutput.**impl.Basic.java
>>
>>
>> protected void writeRDFStatements( Model model, PrintWriter writer )
>> {
>> ResIterator rIter = model.listSubjects();
>> while (rIter.hasNext()) writeRDFStatements( model, rIter.nextResource(),
>> writer );
>> }
>>
>> protected void writeRDFStatements
>> ( Model model, Resource subject, PrintWriter writer )
>> {
>> StmtIterator sIter = model.listStatements( subject, null, (RDFNode) null
>> );
>> writeDescriptionHeader( subject, writer );
>> while (sIter.hasNext()) writePredicate( sIter.nextStatement(), writer );
>> writeDescriptionTrailer( subject, writer );
>> }
>>
>> However, it just prints the statements out in the order the model returns
>> them by listSubjects() and listStatements() for each subject returned. So
>> as Chris said the order is model implementation specific.
>>
>> Claude
>>
>>
>> On Thu, Sep 12, 2013 at 7:01 AM, <[email protected]> wrote:
>>
>> On 2013-09-11 23:15, Chris_Dollin wrote:
>>>
>>> On Wednesday, September 11, 2013 07:28:33 PM [email protected] wrote:
>>>>
>>>> Is there a Jena stmt/triple iterator feeding items in order ?
>>>>
>>>>> I looked around the Jena API list to find, but no luck. However,
>>>>> the 'Model.write(outputStream, lang)' method produces triple
>>>>> listing in hierarchy with indentation - wonder how the method
>>>>> produces such listing.
>>>>>
>>>>>
>>>> Is Model.listStatements() what you're looking for?
>>>>
>>>> [Note: there is no "in order"; the statements come out in some
>>>> unspecified implementation-specific order.]
>>>>
>>>> Chris
>>>>
>>>>
>>> What I'm looking for is another iterator (or a Jena utility ?)
>>> which can order the triples in hierarchy - not in random sequence
>>> from 'listStatements()'. I just need to traverse a resource from
>>> the top to the bottom, and it'd be nice to have an iterator to feed
>>> the triples that way. The model.write() produces triples in sequence
>>> and I just want to utilize that ordering mechanism.
>>>
>>> Chan
>>>
>>>
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