Hi,
here is a Test class using jsonld-java that should do what you want (override
the @context). It reads the jsonld file (that includes an @context defined as a
URI) and the file defining the @context from files on my disk. Just replace
with your own files.
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.StringReader;
import java.util.Map;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.junit.Test;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.github.jsonldjava.utils.JsonUtils;
public class JsonLdReadTest {
@Test
public final void test() throws JsonGenerationException, IOException {
// read the jsonld file (which contains a URI as value of @context)
File f = new File("/Users/fps/Desktop/jsonldTest.json");
Object jsonldObject = JsonUtils.fromInputStream(new FileInputStream(f));
// read the context file
// (here from disk, normally read file at URI defined in @context)
File ctxf = new File("/Users/fps/Desktop/jsonldTestContext.json");
Object jsonLdContext = JsonUtils.fromInputStream(new
FileInputStream(ctxf));
// jsonldObject is a Map.
// Replace value associated to @context
((Map) jsonldObject).put("@context", jsonLdContext);
// the jsonld with the @context replaced
String jsonld = JsonUtils.toString(jsonLdContext);
System.out.println(jsonld);
// no problem now to parse it
Model m = parse(jsonld);
}
private Model parse(String jsonld) {
Model m = ModelFactory.createDefaultModel();
StringReader reader = new StringReader(jsonld);
m.read(reader, null, "JSON-LD");
return m;
}
}
(Note that this is not optimal: the json is parsed twice)
HTH
fps
> Le 7 janv. 2017 à 22:08, Grahame Grieve <[email protected]>
> a écrit :
>
> hi
>
> I am trying to read a json-ld file into a Model so I can use IsoMatcher to
> compare it with another Model.
>
> When I try the simple approach:
>
> Model mj = RDFDataMgr.loadModel([json-ld filename]);
>
> I get the error LOADING_REMOTE_CONTEXT_FAILED returned. I don't know why;
> the file works in the json-ld playground. The source is actually
> http://build.fhir.org/account-example.jsonld. Unfortunately, jsonld-java
> suppresses the original exception.
>
> But irrespective of that, I need to override the @context value and specify
> my own local context instead (I'm actually running the build that generates
> the content for build.fhir.org). I can't find out how to override the
> context. At
> http://stackoverflow.com/questions/41494678/how-can-i-override-the-context-when-loading-json-ld-in-jena
> , it was suggested that I use read(Model model, String uri, Context context)
> <https://jena.apache.org/documentation/javadoc/arq/org/apache/jena/riot/RDFDataMgr.html#read-org.apache.jena.rdf.model.Model-java.lang.String-org.apache.jena.sparql.util.Context->,
> but I've drawn a blank trying to find information about how to use the
> Context to do this.
>
> Alternatively, I could use the loading method documented here:
> https://github.com/jsonld-java/jsonld-java#code-example - but I have no
> idea how to get to a Jena graph from there (and I haven't figured out how
> make the custom resolution work in my Eclipse context either)
>
> How can I get to a Jena graph using a context defined in code somewhere?
> Grahame
>
>
> --
> -----
> http://www.healthintersections.com.au / [email protected]
> / +61 411 867 065
