protected void renderJson()

in src/main/java/org/apache/sling/servlets/resolver/internal/defaults/DefaultErrorHandlerServlet.java [135:196]
48 lines of code
13 McCabe index (conditional complexity)

    protected void renderJson(ServletRequest req, ServletResponse res, String statusMessage, String requestUri,
            String servletName, int statusCode) throws IOException {
        HttpServletResponse response = (HttpServletResponse)res;
        response.setStatus(statusCode);
        response.setContentType(JSON_CONTENT_TYPE);
        response.setCharacterEncoding("UTF-8");

        // send the error as JSON
        try (JsonGenerator jsonGenerator = Json.createGenerator(res.getWriter())) {
            jsonGenerator.writeStartObject();
            jsonGenerator.write("status", statusCode);

            String msg = (String)req.getAttribute(SlingConstants.ERROR_MESSAGE);
            if (msg != null && !msg.isEmpty()) {
                jsonGenerator.write("message", statusMessage);
            }

            if (requestUri != null && !requestUri.isEmpty()) {
                jsonGenerator.write("requestUri", requestUri);
            }

            if (servletName != null && !servletName.isEmpty()) {
                jsonGenerator.write("servletName", servletName);
            }

            // SLING-10615 - for backward compatibility check for either a
            // String or Class value
            Object exceptionTypeObj = req.getAttribute(SlingConstants.ERROR_EXCEPTION_TYPE);
            String exceptionType = null;
            if (exceptionTypeObj instanceof String) {
                exceptionType = (String)exceptionTypeObj;
            } else if (exceptionTypeObj instanceof Class) {
                exceptionType = ((Class<?>)exceptionTypeObj).getName();
            }
            if (exceptionType != null && !exceptionType.isEmpty()) {
                jsonGenerator.write("exceptionType", exceptionType);
            }

            // dump the stack trace
            if (req.getAttribute(SlingConstants.ERROR_EXCEPTION) instanceof Throwable) {
                final Throwable throwable = (Throwable) req.getAttribute(SlingConstants.ERROR_EXCEPTION);
                try (StringWriter sw = new StringWriter();
                        PrintWriter pw = new PrintWriter(sw)) {
                    printStackTrace(pw, throwable);
                    jsonGenerator.write("exception", sw.toString());
                }
            }

            // dump the request progress tracker
            if (req instanceof SlingHttpServletRequest) {
                // dump the request progress tracker
                final RequestProgressTracker tracker = ((SlingHttpServletRequest)req).getRequestProgressTracker();
                StringWriter strWriter = new StringWriter();
                try (PrintWriter progressWriter = new PrintWriter(strWriter)) {
                    tracker.dump(progressWriter);
                }
                jsonGenerator.write("requestProgress", strWriter.toString());
            }

            jsonGenerator.writeEnd();
        }
    }