protected void doPost()

in reference/src/main/java/org/apache/sling/cms/reference/forms/impl/FormHandler.java [66:122]
52 lines of code
6 McCabe index (conditional complexity)

    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response)
            throws ServletException, IOException {
        ValueMap properties = request.getResource().getValueMap();

        String pagePath = Optional.ofNullable(request.getResource().adaptTo(PageManager.class))
                .map(PageManager::getPage).map(Page::getPath)
                .orElse(StringUtils.substringBefore(request.getResource().getPath(), "/" + JcrConstants.JCR_CONTENT));
        String successPage = null;
        String errorPage = pagePath;

        StringSubstitutor sub = null;
        try {
            log.debug("Extracting form request...");
            FormRequest formRequest = request.adaptTo(FormRequest.class);
            if (formRequest == null) {
                log.warn("Unable to create form request");
                response.sendRedirect(this.resolveUrl(request, errorPage, "error=init"));
                return;
            }

            log.debug("Loading fields...");
            boolean fieldsLoadSucceeded = ((FormRequestImpl) formRequest).initFields();
            sub = new StringSubstitutor(formRequest.getFormData());
            errorPage = sub.replace(properties.get("errorPage", pagePath));
            if (!fieldsLoadSucceeded) {
                log.warn("Field initialization failed, check logs");
                response.sendRedirect(this.resolveUrl(request, errorPage, "error=fields"));
                return;
            }
            request.getSession().setAttribute(formRequest.getSessionId(), formRequest.getFormData());

            log.debug("Calling actions...");
            callActions(request, formRequest);
            successPage = sub.replace(properties.get("successPage", pagePath));
            request.getSession().removeAttribute(formRequest.getSessionId());
        } catch (FormException e) {
            log.warn("Exception executing actions", e);
            response.sendRedirect(request.getResourceResolver().map(request, pagePath) + ".html?error=actions");
            return;
        }

        if (StringUtils.isNotBlank(successPage)) {
            if ("forward".equals(properties.get("successAction", String.class))) {
                SlingHttpServletRequestWrapper requestWrapper = new SlingHttpServletRequestWrapper(request) {
                    @Override
                    public String getMethod() {
                        return "GET";
                    }
                };
                request.getRequestDispatcher(successPage).forward(requestWrapper, response);
            } else {
                response.sendRedirect(resolveUrl(request, successPage, "message=success"));
            }
        } else {
            response.sendRedirect(resolveUrl(request, pagePath, "message=success"));
        }
    }