private static PrettyPrinter buildDefaultPrettyPrinter() {
  DefaultPrettyPrinter pp =
      new DefaultPrettyPrinter("") {
        @Override
        public DefaultPrettyPrinter withSeparators(Separators separators) {
          this._separators = separators;
          this._objectFieldValueSeparatorWithSpaces =
              separators.getObjectFieldValueSeparator() + " ";
          return this;
        }
      };
  Indenter lfOnlyIndenter = new DefaultIndenter("  ", "\n");
  pp.indentArraysWith(lfOnlyIndenter);
  pp.indentObjectsWith(lfOnlyIndenter);
  return pp;
}
 

@Override
public void startDocument() throws QueryResultHandlerException {
	if (!documentOpen) {
		documentOpen = true;
		headerOpen = false;
		headerComplete = false;
		tupleVariablesFound = false;
		firstTupleWritten = false;
		linksFound = false;

		if (getWriterConfig().get(BasicWriterSettings.PRETTY_PRINT)) {
			// SES-2011: Always use \n for consistency
			Indenter indenter = DefaultIndenter.SYSTEM_LINEFEED_INSTANCE;
			// By default Jackson does not pretty print, so enable this unless
			// PRETTY_PRINT setting is disabled
			DefaultPrettyPrinter pp = new DefaultPrettyPrinter().withArrayIndenter(indenter)
					.withObjectIndenter(indenter);
			jg.setPrettyPrinter(pp);
		}

		try {
			if (getWriterConfig().isSet(BasicQueryWriterSettings.JSONP_CALLBACK)) {
				// SES-1019 : Write the callbackfunction name as a wrapper for
				// the results here
				String callbackName = getWriterConfig().get(BasicQueryWriterSettings.JSONP_CALLBACK);
				jg.writeRaw(callbackName);
				jg.writeRaw("(");
			}
			jg.writeStartObject();
		} catch (IOException e) {
			throw new QueryResultHandlerException(e);
		}
	}
}
 

public static void modelToRdfJsonInternal(final Model graph, final WriterConfig writerConfig,
		final JsonGenerator jg) throws IOException, JsonGenerationException {
	if (writerConfig.get(BasicWriterSettings.PRETTY_PRINT)) {
		// SES-2011: Always use \n for consistency
		Indenter indenter = DefaultIndenter.SYSTEM_LINEFEED_INSTANCE;
		// By default Jackson does not pretty print, so enable this unless
		// PRETTY_PRINT setting is disabled
		DefaultPrettyPrinter pp = new DefaultPrettyPrinter().withArrayIndenter(indenter)
				.withObjectIndenter(indenter);
		jg.setPrettyPrinter(pp);
	}
	jg.writeStartObject();
	for (final Resource nextSubject : graph.subjects()) {
		jg.writeObjectFieldStart(RDFJSONWriter.resourceToString(nextSubject));
		for (final IRI nextPredicate : graph.filter(nextSubject, null, null).predicates()) {
			jg.writeArrayFieldStart(nextPredicate.stringValue());
			for (final Value nextObject : graph.filter(nextSubject, nextPredicate, null).objects()) {
				// contexts are optional, so this may return empty in some
				// scenarios depending on the interpretation of the way contexts
				// work
				final Set<Resource> contexts = graph.filter(nextSubject, nextPredicate, nextObject).contexts();

				RDFJSONWriter.writeObject(nextObject, contexts, jg);
			}
			jg.writeEndArray();
		}
		jg.writeEndObject();
	}
	jg.writeEndObject();
}