> On Mar 12, 2018, at 5:47 PM, Andy Seaborne <[email protected]> wrote: > > One at a time and performance ...
I know, it's true. I am actively searching for ways to NOT do this, but I'm in a tight architectural spot in which I'm trying to integrate two codebases that aren't mine. Essentially, I'm pulling individual fields from a database and dealing with them as RDF. Not what I want to be doing, certainly. I understand fully the poor setup inherent in this problem. > You could create a TokenizerText.makeTokenizerString and simply pull 4 tokens > out and then check end of stream or DOT. > Do you need the quad immediately or can you create a inout that t=you send > the string to and catch it in the StreamRDF, and reuse that framework across > quad parsing? Sort of-- just to make things even worse, the action is taking place in a class subclassing a type from the database codebase that explicitly warns not to keep any state. So reuse becomes difficult at best. I'm going to follow up on TokenizerFactory::makeTokenizerString, and also on some way I can get myself into a better position to do this work instead of grinding on it from the disadvantage in which I now find myself. Just as a matter of interest, it's an implementation of LDP [1] over Apache Cassandra. ajs6f [1] https://github.com/trellis-ldp/trellis > > Andy > > On 12/03/18 20:18, ajs6f wrote: >> org.apache.jena.sparql.core.Quad. That's enough for what I want to do. >> ajs6f >>> On Mar 12, 2018, at 4:17 PM, Martynas Jusevičius <[email protected]> >>> wrote: >>> >>> So what are you going to parse the quad into, if not Dataset? >>> >>> On Mon, Mar 12, 2018 at 9:11 PM, ajs6f <[email protected]> wrote: >>> >>>> Thanks, Martynas, but no; I don't have a Dataset (and don't need or want >>>> to build one for a single quad), and no InputStream (although I could get >>>> one from a String without too much fuss. >>>> >>>> RDFDataMgr or RDFParser are usually the best tools for parsing, but I'm >>>> looking for something a bit lighter-weight. >>>> >>>> ajs6f >>>> >>>>> On Mar 12, 2018, at 4:07 PM, Martynas Jusevičius <[email protected]> >>>> wrote: >>>>> >>>>> Maybe this? >>>>> https://jena.apache.org/documentation/javadoc/arq/org/ >>>> apache/jena/riot/RDFDataMgr.html#read-org.apache.jena. >>>> query.Dataset-java.io.InputStream-org.apache.jena.riot.Lang- >>>>> >>>>> On Mon, Mar 12, 2018 at 8:46 PM, ajs6f <[email protected]> wrote: >>>>> >>>>>> I've got a use case for parsing one quad (in NQuads form) from a String. >>>>>> I've been paging around through RIOT and other parts of Jena, but I just >>>>>> can't seem to find any way to do this without building up a bunch of >>>>>> auxiliary objects (like Readers or StreamRDFs, etc.). Performance is >>>>>> something of a concern, so I'd rather not build up any more than I have >>>> to. >>>>>> >>>>>> Am I missing something, or do we just not expose that functionality? >>>> (I'm >>>>>> inclined to bet that we _have_ to have impled it somewhere, just for our >>>>>> own sanity, but maybe not!) >>>>>> >>>>>> ajs6f >>>>>> >>>>>> >>>> >>>>
