hi philipp, i'm currently using the dbus resource because i'm writing the openrdf repository in java and didn't want to got down the jni, jna road...
i already have built in a switch in tracker-resource.vala, about here [1], testing the cursor.get_value_type, but the returned value_types are not totally correct. for some uris the value is 1 for other uris the value type is 2... i'm gonna issue a bug report, as soon as i have verified, that i'm not doing something wrong.. also the returned value_types are only 1 or 2.. there are not other values (like bnode, double, date...) although the returned string suggest they should be used.. wkr turnguard [1] https://git.gnome.org/browse/tracker/tree/src/tracker-store/tracker-resources.vala#n102 | Jürgen Jakobitsch, | Software Developer | Semantic Web Company GmbH | Mariahilfer Straße 70 / Neubaugasse 1, Top 8 | A - 1070 Wien, Austria | Mob +43 676 62 12 710 | Fax +43.1.402 12 35 - 22 COMPANY INFORMATION | web : http://www.semantic-web.at/ | foaf : http://company.semantic-web.at/person/juergen_jakobitsch PERSONAL INFORMATION | web : http://www.turnguard.com | foaf : http://www.turnguard.com/turnguard | g+ : https://plus.google.com/111233759991616358206/posts | skype : jakobitsch-punkt | xmlns:tg = "http://www.turnguard.com/turnguard#"; 2014-04-18 11:32 GMT+02:00 Philip Van Hoof <phi...@codeminded.be>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > get_value_type and get_variable_name: > > > https://git.gnome.org/browse/tracker/tree/src/libtracker-sparql/tracker-cursor.vala#n126 > > > https://git.gnome.org/browse/tracker/tree/src/libtracker-sparql/tracker-cursor.vala#n139 > > You btw shouldn't use the DBus Resources1 object, but use > libtracker-sparql instead. > > > Ivan Frade schreef op 17/04/2014 20:14: > > Hi Jürgen, > > > > Yes, tracker does not return bindingNames or types of the resulting > > nodes. It assumes the client takes care of interpreting the results > > of its query. > > > > A workaround would be to parse the SparQL in the wrapper and add > > that information when translating the DBus result set to the > > openrdf format. The binding Names can be added straight forward > > from the SELECT of the query. The type information is more > > complicated to deduce, based on the position in the query and/or > > the rdfs:range of the properties (defined in the ontology). > > > > Regards, > > > > Ivan > > > > > > On Thu, Apr 17, 2014 at 10:11 AM, Jürgen Jakobitsch < > > j.jakobit...@semantic-web.at> wrote: > > > >> hi, > >> > >> i'm currently developing an openrdf [1] repository implementation > >> with a tracker-sparql backend via dbus. this will enable java > >> developers to include tracker-sparql results in any application > >> (or create a sparql endpoint) extremly easily. openrdf's api is > >> quite common in the semweb community.. > >> > >> everything is working very nice already the only trouble i'm > >> having is that i get a vector of vectors containing simple > >> strings as a result object, meaning i need to find out types > >> (literals, uris, bnodes, typed literals).. > >> > >> is there any known way to retrieve some more information in the > >> results given via dbus? also bindingNames are missing... > >> > >> any pointer really appreciated wkr turnguard.. > >> > >> > >> [1] http://www.openrdf.org/ > >> > >> | Jürgen Jakobitsch, | Software Developer | Semantic Web Company > >> GmbH | Mariahilfer Straße 70 / Neubaugasse 1, Top 8 | A - 1070 > >> Wien, Austria | Mob +43 676 62 12 710 | Fax +43.1.402 12 35 - 22 > >> > >> COMPANY INFORMATION | web : http://www.semantic-web.at/ | > >> foaf : > >> http://company.semantic-web.at/person/juergen_jakobitsch PERSONAL > >> INFORMATION | web : http://www.turnguard.com | foaf : > >> http://www.turnguard.com/turnguard | g+ : > >> https://plus.google.com/111233759991616358206/posts | skype : > >> jakobitsch-punkt | xmlns:tg = > >> "http://www.turnguard.com/turnguard#"; > >> > >> _______________________________________________ tracker-list > >> mailing list tracker-list@gnome.org > >> https://mail.gnome.org/mailman/listinfo/tracker-list > >> > >> > > > > > > > > _______________________________________________ tracker-list > > mailing list tracker-list@gnome.org > > https://mail.gnome.org/mailman/listinfo/tracker-list > > > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.20 (MingW32) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJTUPETAAoJEEP2NSGEz4aDuUAIALHr/46yb4hUVuj5GWaxls3F > H5JODAvmGHEuQsgSmemjj9GQyFEUb2VClM6KjoBqK1+sn8FxVDKXaTn7yUMJNdjz > tzefo25nuAzwiKGgnpwjhlw474PvlhGlaEIvUiQTQiMAdE9DV5sR3gzSZ5N7Eoo7 > p/8jPi4EaARgaLlxDOlAwQqpQTe3qPOPjQcNeerWgO+azemFaSYjdR1o8f32726n > 7b92sidVMDv4Zoq2Osh9EEycS/4fxUvWE1eBYG7BgyNAf5QMv3S/mlmFGStZnS70 > +hqumsvcWyaI+wQ3iMELqioFDfHYNdQfjYnr/jgJSFEZrYliU2lyla093frQ61Y= > =FF/z > -----END PGP SIGNATURE----- >
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