Comments (8)
Hi,
The executor.execute
-command returns a QuadStore, which has a write
method that takes the format as one of the parameters. For example, the snippet below writes the output as jsonld to stdout.
QuadStore result = executor.execute(triplesMaps, checkOptionPresence(removeduplicatesOption, lineArgs, configFile), metadataGenerator);
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
result.write(out, "jsonld");
Does this help?
from rmlmapper-java.
Thanks for the response.
Yeah that's what I am looking for. But its not working
It throws Serialization jsonld not supported when I try to write the output as jsonld.
from rmlmapper-java.
Ah, could it be that you are using a SimpleQuadStore
instead of a RDF4JStore
when creating the Executor
?
Executor executor = new Executor(rmlStore, factory, functionLoader, outputStore, Utils.getBaseDirectiveTurtle(is));
The outputStore
of this line should be an RDF4JStore
.
from rmlmapper-java.
I am using below code snippet. I am using RDF4JStore only.
InputStream mappingStream = new FileInputStream(mappingFile);
Model model = Rio.parse(mappingStream, "", RDFFormat.TURTLE);
RDF4JStore outputStore = new RDF4JStore(model);
Executor executor = new Executor(outputStore, new RecordsFactory(new DataFetcher(cwd, outputStore)));
QuadStore chromResult = executor.execute(executor.getTriplesMaps());
chromResult.removeDuplicates();
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
chromResult.write(out, "jsonld");`
from rmlmapper-java.
Ah, yes, there's a bit of confusion here: you need QuadStore for your RML mapping, and a second QuadStore for your output data. You can check https://github.com/RMLio/rmlmapper-java/blob/master/src/main/java/be/ugent/rml/cli/Main.java for more details, but I guess you need something along the lines of
// Read mapping file
InputStream mappingStream = new FileInputStream(mappingFile);
Model model = Rio.parse(mappingStream, "", RDFFormat.TURTLE);
RDF4JStore rmlStore= new RDF4JStore(model);
// Load functions
FunctionLoader functionLoader = new FunctionLoader(null, null, new HashMap<>());
// Prepare output store
RDF4JStore outputStore = new RDF4JStore();
// Create executor
Executor executor = new Executor(rmlStore, new RecordsFactory(new DataFetcher(cwd, rmlStore)),functionLoader, outputStore, Utils.getBaseDirectiveTurtle(mappingStream ));
// Execute
QuadStore chromResult = executor.execute(executor.getTriplesMaps());
chromResult.removeDuplicates();
// Write result
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
chromResult.write(out, "jsonld");`
from rmlmapper-java.
I am facing new problem with this code. Utils.getBaseDirectiveTurtle is not available method in Utils class. Is this from be.ugent.rml.Utils class ?
from rmlmapper-java.
Indeed, please see https://github.com/RMLio/rmlmapper-java/blob/master/src/main/java/be/ugent/rml/cli/Main.java for the imports
from rmlmapper-java.
Thanks, It worked, the problem is, I was using older jar. Thanks for helping out :)
from rmlmapper-java.
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