How to use

TurtlePrettyPrinter

in

org.ldp4j.rdf.sesame

@Override
public void handleComment(String comment) throws RDFHandlerException {
  trace("Discarded comment '%s'.",comment);
}

@Test
public void testWithbase$simpleDoc$UnusedNamespacesAreDiscarded() throws Exception {
  withBase.startRDF();
  withBase.handleNamespace(NS1_PX1, NS1_NAMESPACE);
  withBase.handleNamespace(NS2_PX, NS2_NAMESPACE);
  withBase.handleNamespace(NO_PX,NO_NAMESPACE);
  withBase.handleStatement(statement(uriRef(NS1_NAMESPACE,URI1),uriRef(NS2_NAMESPACE,URI2),blankNode(BN_FOLDED)));
  withBase.endRDF();
  assertThat(outWithBase.toString(),containsString(BASE_DIRECTIVE));
  assertThat(outWithBase.toString(),containsString(prefixDirective(NS1_PX1, NS1_NAMESPACE)));
  assertThat(outWithBase.toString(),containsString(prefixDirective(NS2_PX, NS2_NAMESPACE)));
  assertThat(outWithBase.toString(),containsString(qname(NS1_PX1,URI1)));
  assertThat(outWithBase.toString(),containsString(qname(NS2_PX,URI2)));
  assertThat(outWithBase.toString(),containsString(blankNode(BN_FOLDED).toString()));
  assertThat(outWithBase.toString(),not(containsString(prefixDirective(NO_PX, NO_NAMESPACE))));
  assertThat(outWithBase.toString(),not(containsString(uriRef(NS1_NAMESPACE,URI1).toString())));
  assertThat(outWithBase.toString(),not(containsString(uriRef(NS2_NAMESPACE,URI2).toString())));
}

public static String prettyPrint(RepositoryConnection connection, Resource... contexts) throws SesameUtilsException {
  try {
    StringWriter writer = new StringWriter();
    connection.export(new TurtlePrettyPrinter(writer), contexts);
    return writer.toString();
  } catch(RepositoryException e) {
    throw new SesameRepositoryFailure(COULD_NOT_SERIALIZE_CONTENTS,e);
  } catch (RDFHandlerException e) {
    throw new SesameUtilsAssertionError("Unexpected pretty printer failure",e);
  } catch(UnsupportedRDFormatException e) {
    throw new SesameUtilsAssertionError(TURTLE_FORMAT_SHOULD_BE_SUPPORTED, e);
  }
}

@Test
public void testNobase$emptuDoc$NamespacesAreDiscarded() throws Exception {
  noBase.startRDF();
  noBase.handleNamespace(NS1_PX1, NS1_NAMESPACE);
  noBase.endRDF();
  assertThat(outNoBase.toString(),isEmptyString());
}

@Test
public void testNoBase$emptyDoc$CommentsAreDiscarded() throws Exception {
  noBase.startRDF();
  noBase.handleComment(COMMENT);
  noBase.endRDF();
  assertThat(outNoBase.toString(),isEmptyString());
}

@Test
public void testWithBase$emptyDoc() throws Exception {
  withBase.startRDF();
  withBase.endRDF();
  assertThat(outWithBase.toString(),containsString(BASE_DIRECTIVE));
}

@Test
public void testWithbase$simpleDoc$NamespacePrefixesOverlap() throws Exception {
  withBase.startRDF();
  withBase.handleNamespace(NS1_PX1, NS1_NAMESPACE);
  withBase.handleNamespace(NS2_PX, NS2_NAMESPACE);
  withBase.handleNamespace(NS1_PX2,NS1_NAMESPACE);
  withBase.handleStatement(statement(uriRef(NS1_NAMESPACE,URI1),uriRef(NS2_NAMESPACE,URI2),blankNode(BN_FOLDED)));
  withBase.endRDF();
  assertThat(outWithBase.toString(),containsString(BASE_DIRECTIVE));
  assertThat(outWithBase.toString(),containsString(prefixDirective(NS1_PX2, NS1_NAMESPACE)));
  assertThat(outWithBase.toString(),containsString(prefixDirective(NS2_PX, NS2_NAMESPACE)));
  assertThat(outWithBase.toString(),containsString(qname(NS1_PX2,URI1)));
  assertThat(outWithBase.toString(),containsString(qname(NS2_PX,URI2)));
  assertThat(outWithBase.toString(),containsString(blankNode(BN_FOLDED).toString()));
  assertThat(outWithBase.toString(),not(containsString(prefixDirective(NS1_PX1, NS1_NAMESPACE))));
  assertThat(outWithBase.toString(),not(containsString(qname(NS1_PX1,URI1))));
  assertThat(outWithBase.toString(),not(containsString(uriRef(NS1_NAMESPACE,URI1).toString())));
  assertThat(outWithBase.toString(),not(containsString(uriRef(NS2_NAMESPACE,URI2).toString())));
}

@Before
public void setUp() {
  vf = new MemValueFactory();
  outNoBase = new StringWriter();
  outWithBase = new StringWriter();
  noBase = new TurtlePrettyPrinter(outNoBase);
  withBase = new TurtlePrettyPrinter(vf.createURI(BASE),outWithBase);
}

@Test
public void testWithbase$emptyDoc$NamespacesAreDiscarded() throws Exception {
  withBase.startRDF();
  withBase.handleNamespace(NS1_PX1, NS1_NAMESPACE);
  withBase.endRDF();
  assertThat(outWithBase.toString(),containsString(BASE_DIRECTIVE));
  assertThat(outWithBase.toString(),not(containsString(prefixDirective(NS1_PX1, NS1_NAMESPACE))));
}

@Test
public void testWithBase$emptyDoc$CommentsAreDiscarded() throws Exception {
  withBase.startRDF();
  withBase.handleComment(COMMENT);
  withBase.endRDF();
  assertThat(outWithBase.toString(),containsString(BASE_DIRECTIVE));
  assertThat(outWithBase.toString(),not(containsString(comment(COMMENT))));
}

@Test
public void testNoBase$emptyDoc() throws Exception {
  noBase.startRDF();
  noBase.endRDF();
  assertThat(outNoBase.toString(),isEmptyString());
}

private RDFWriter createWriter(StringWriter writer) {
  RDFWriter result=null;
  if(format.equals(Format.TURTLE)) {
    result=new TurtlePrettyPrinter(new MemValueFactory().createURI(baseURI.toString()),writer);
  } else {
    RDFWriterRegistry registry=RDFWriterRegistry.getInstance();
    RDFFormat rawFormat=Rio.getWriterFormatForMIMEType(format.getMime(),RDFFormat.RDFXML);
    RDFWriterFactory factory=registry.get(rawFormat);
    result=factory.getWriter(writer);
    if(format.equals(Format.JSON_LD)) {
      result.getWriterConfig().set(JSONLDSettings.JSONLD_MODE,JSONLDMode.FLATTEN);
      result.getWriterConfig().set(BasicWriterSettings.PRETTY_PRINT,true);
    }
  }
  return result;
}

@Override
public void handleNamespace(String prefix, String uri) throws RDFHandlerException {
  graph.addNamespace(prefix, uri);
  trace("Added prefix '%s' for namespace '%s'.",prefix,uri);
}

@Override
public void startRDF() throws RDFHandlerException {
  trace("Started RDF processing...");
  graph=new GraphImpl(base);
}

@Override
public void endRDF() throws RDFHandlerException {
  GraphRenderer renderer=new GraphRenderer(graph,writerConfig.get(ENABLE_FOLDING));
  out.append(renderer.render());
  out.flush();
  trace("Completed RDF processing.");
}

@Override
public void handleStatement(Statement st) throws RDFHandlerException {
  Resource subject = st.getSubject();
  URI predicate = st.getPredicate();
  Value object = st.getObject();
  trace("Added triple (%s,%s,%s).",subject,predicate,object);
  graph.add(subject, predicate, object);
}