Re: Overriding @context when loading JSON-LD

[François-Paul Servant]

oops, there’s a typo in the code that I sent. Here is it again:

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 (with 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(jsonLdObject);
        
        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;
}

}