public void commence()

in plugins/spring/src/main/java/org/apache/cxf/fediz/spring/web/FederationAuthenticationEntryPoint.java [91:142]
42 lines of code
9 McCabe index (conditional complexity)

    public void commence(final HttpServletRequest servletRequest, final HttpServletResponse response,
            final AuthenticationException authenticationException) throws IOException, ServletException {

        FedizContext fedContext = federationConfig.getFedizContext();
        LOG.debug("Federation context: {}", fedContext);

        // First see if we want to handle the request in some custom way
        if (requestHandler != null && requestHandler.canHandleRequest(servletRequest)) {
            requestHandler.handleRequest(servletRequest, response);
            return;
        }

        // Check to see if it is a metadata request
        MetadataDocumentHandler mdHandler = new MetadataDocumentHandler(fedContext);
        if (mdHandler.canHandleRequest(servletRequest)) {
            mdHandler.handleRequest(servletRequest, response);
            return;
        }

        final String redirectUrl;
        try {
            FedizProcessor wfProc =
                FedizProcessorFactory.newFedizProcessor(fedContext.getProtocol());
            RedirectionResponse redirectionResponse =
                wfProc.createSignInRequest(servletRequest, fedContext);
            redirectUrl = redirectionResponse.getRedirectionURL();

            if (redirectUrl == null) {
                LOG.warn("Failed to create SignInRequest. Redirect URL null");
                throw new ServletException("Failed to create SignInRequest. Redirect URL null");
            }

            Map<String, String> headers = redirectionResponse.getHeaders();
            if (!headers.isEmpty()) {
                for (Entry<String, String> entry : headers.entrySet()) {
                    response.addHeader(entry.getKey(), entry.getValue());
                }
            }

            HttpSession session = servletRequest.getSession(true);
            session.setAttribute(SAVED_CONTEXT, redirectionResponse.getRequestState());
        } catch (ProcessingException ex) {
            LOG.warn("Failed to create SignInRequest", ex);
            throw new ServletException("Failed to create SignInRequest: " + ex.getMessage());
        }

        preCommence(servletRequest, response);
        if (LOG.isInfoEnabled()) {
            LOG.info("Redirecting to IDP: " + redirectUrl);
        }
        response.sendRedirect(redirectUrl);
    }