eventespresso / event-espresso-core

        }

        $this->_route = false;

        // check that the page_routes array is not empty

        if (empty($this->_page_routes)) {

            // user error msg

            $error_msg = sprintf(

                esc_html__('No page routes have been set for the %s admin page.', 'event_espresso'),

                $this->_admin_page_title

            );

            // developer error msg

            $error_msg .= '||' . $error_msg

                          . esc_html__(

                              ' Make sure the "set_page_routes()" method exists, and is setting the "_page_routes" array properly.',

                              'event_espresso'

                          );

            throw new EE_Error($error_msg);

        }

        // and that the requested page route exists

        if (array_key_exists($this->_req_action, $this->_page_routes)) {

            $this->_route = $this->_page_routes[ $this->_req_action ];

            $this->_route_config = isset($this->_page_config[ $this->_req_action ])

                ? $this->_page_config[ $this->_req_action ] : array();

        } else {

            // user error msg

            $error_msg = sprintf(

                esc_html__(

                    'The requested page route does not exist for the %s admin page.',

                    'event_espresso'

                ),

                $this->_admin_page_title

            );

            // developer error msg

            $error_msg .= '||' . $error_msg

                          . sprintf(

                              esc_html__(

                                  ' Create a key in the "_page_routes" array named "%s" and set its value to the appropriate method.',

                                  'event_espresso'

                              ),

                              $this->_req_action

                          );

            throw new EE_Error($error_msg);

        }

        // and that a default route exists

        if (! array_key_exists('default', $this->_page_routes)) {

            throw new EE_Error($error_msg);

        }

        // and that a default route exists

        if (! array_key_exists('default', $this->_page_routes)) {

            // user error msg

            $error_msg = sprintf(

                esc_html__(

                    'A default page route has not been set for the % admin page.',

                    'event_espresso'

                ),

                $this->_admin_page_title

            );

            // developer error msg

            $error_msg .= '||' . $error_msg

                          . esc_html__(

                              ' Create a key in the "_page_routes" array named "default" and set its value to your default page method.',

                              'event_espresso'

                          );

            throw new EE_Error($error_msg);

        }

        // first lets' catch if the UI request has EVER been set.