public void renderTemplate()

in core/src/main/java/org/apache/struts2/components/template/FreemarkerTemplateEngine.java [66:157]
70 lines of code
11 McCabe index (conditional complexity)

    public void renderTemplate(TemplateRenderingContext templateContext) throws Exception {
    	// get the various items required from the stack
        ValueStack stack = templateContext.getStack();
        ActionContext context = stack.getActionContext();
        ServletContext servletContext = context.getServletContext();
        HttpServletRequest req = context.getServletRequest();
        HttpServletResponse res = context.getServletResponse();

        // prepare freemarker
        Configuration config = freemarkerManager.getConfiguration(servletContext);

        // get the list of templates we can use
        List<Template> templates = templateContext.getTemplate().getPossibleTemplates(this);

        // find the right template
        freemarker.template.Template template = null;
        String templateName = null;
        Exception exception = null;
        for (Template t : templates) {
            templateName = getFinalTemplateName(t);
                try {
                    // try to load, and if it works, stop at the first one
                    template = config.getTemplate(templateName);
                    break;
                } catch (ParseException e) {
                    // template was found but was invalid - always report this.
                    exception = e;
                    break;
                } catch (IOException e) {
                    // FileNotFoundException is anticipated - report the first IOException if no template found
                    if (exception == null) {
                        exception = e;
                    }
                }
        }

        if (template == null) {
            if (LOG.isErrorEnabled()) {
                LOG.error("Could not load the FreeMarker template named '{}':", templateContext.getTemplate().getName());
                for (Template t : templates) {
                    LOG.error("Attempted: {}", getFinalTemplateName(t));
                }
                LOG.error("The TemplateLoader provided by the FreeMarker Configuration was a: {}", config.getTemplateLoader().getClass().getName());
            }
            if (exception != null) {
                throw exception;
            } else {
                return;
            }
        }

        LOG.debug("Rendering template: {}", templateName);

        ActionInvocation ai = ActionContext.getContext().getActionInvocation();

        Object action = (ai == null) ? null : ai.getAction();
        if (action == null) {
            LOG.warn("Rendering tag {} out of Action scope, accessing directly JSPs is not recommended! " +
                    "Please read https://struts.apache.org/security/#never-expose-jsp-files-directly", templateName);
        }
        SimpleHash model = freemarkerManager.buildTemplateModel(stack, action, servletContext, req, res, config.getObjectWrapper());

        model.put("tag", templateContext.getTag());
        model.put("themeProperties", getThemeProps(templateContext.getTemplate()));

        // the BodyContent JSP writer doesn't like it when FM flushes automatically --
        // so let's just not do it (it will be flushed eventually anyway)
        Writer writer = templateContext.getWriter();
        final Writer wrapped = writer;
        writer = new Writer() {
            public void write(char[] cbuf, int off, int len) throws IOException {
                wrapped.write(cbuf, off, len);
            }

            public void flush() throws IOException {
                // nothing!
            }

            public void close() throws IOException {
                wrapped.close();
            }
        };

        LOG.debug("Push tag on top of the stack");
        stack.push(templateContext.getTag());
        try {
            template.process(model, writer);
        } finally {
            LOG.debug("Removes tag from top of the stack");
            stack.pop();
        }
    }