/**
  * Does the hard work: installs the module and registers needed constants
  *
  * @return string
  */
 public function install()
 {
     //search the master page
     $objMaster = class_module_pages_page::getPageByName("master");
     if ($objMaster != null) {
         $this->strMasterID = $objMaster->getSystemid();
     }
     //fetch navifolder-id
     $strNaviFolderId = "";
     $arrFolder = class_module_pages_folder::getFolderList();
     foreach ($arrFolder as $objOneFolder) {
         if ($objOneFolder->getStrName() == "mainnavigation") {
             $strNaviFolderId = $objOneFolder->getSystemid();
         }
     }
     $strReturn = "";
     $strReturn .= "Creating new mainnavigation-tree\n";
     $objNaviTree = new class_module_navigation_tree();
     $objNaviTree->setStrName("mainnavigation");
     $objNaviTree->setStrFolderId($strNaviFolderId);
     $objNaviTree->updateObjectToDb();
     $strTreeId = $objNaviTree->getSystemid();
     $strReturn .= "ID of new navigation-tree: " . $strTreeId . "\n";
     $strReturn .= "Creating new portalnavigation-tree\n";
     $objNaviTree = new class_module_navigation_tree();
     $objNaviTree->setStrName("portalnavigation");
     $objNaviTree->updateObjectToDb();
     $strTreePortalId = $objNaviTree->getSystemid();
     $strReturn .= "ID of new navigation-tree: " . $strTreePortalId . "\n";
     $strReturn .= "Creating navigation points\n";
     $objNaviPoint = new class_module_navigation_point();
     $objNaviPoint->setStrName("Home");
     $objNaviPoint->setStrPageI("index");
     $objNaviPoint->updateObjectToDb($strTreePortalId);
     if ($this->strMasterID != "") {
         $strReturn .= "Adding mainnavigation to master page\n";
         $strReturn .= "ID of master page: " . $this->strMasterID . "\n";
         if (class_module_pages_element::getElement("navigation") != null) {
             $objPagelement = new class_module_pages_pageelement();
             $objPagelement->setStrPlaceholder("mastermainnavi_navigation");
             $objPagelement->setStrName("mastermainnavi");
             $objPagelement->setStrElement("navigation");
             $objPagelement->updateObjectToDb($this->strMasterID);
             $strElementId = $objPagelement->getSystemid();
             $strQuery = "UPDATE " . _dbprefix_ . "element_navigation\n                                SET navigation_id= ?,\n                                    navigation_template = ?\n                                WHERE content_id = ?";
             if ($this->objDB->_pQuery($strQuery, array($strTreeId, "mainnavi.tpl", $strElementId))) {
                 $strReturn .= "Navigation element created.\n";
             } else {
                 $strReturn .= "Error creating navigation element.\n";
             }
         }
         $strReturn .= "Adding portalnavigation to master page\n";
         $strReturn .= "ID of master page: " . $this->strMasterID . "\n";
         if (class_module_pages_element::getElement("navigation") != null) {
             $objPagelement = new class_module_pages_pageelement();
             $objPagelement->setStrPlaceholder("masterportalnavi_navigation");
             $objPagelement->setStrName("masterportalnavi");
             $objPagelement->setStrElement("navigation");
             $objPagelement->updateObjectToDb($this->strMasterID);
             $strElementId = $objPagelement->getSystemid();
             $strQuery = "UPDATE " . _dbprefix_ . "element_navigation\n                                SET navigation_id= ?,\n                                    navigation_template = ?\n                                WHERE content_id = ?";
             if ($this->objDB->_pQuery($strQuery, array($strTreePortalId, "portalnavi.tpl", $strElementId))) {
                 $strReturn .= "Navigation element created.\n";
             } else {
                 $strReturn .= "Error creating navigation element.\n";
             }
         }
         $strReturn .= "Adding pathnavigation to master page\n";
         $strReturn .= "ID of master page: " . $this->strMasterID . "\n";
         if (class_module_pages_element::getElement("navigation") != null) {
             $objPagelement = new class_module_pages_pageelement();
             $objPagelement->setStrPlaceholder("masterpathnavi_navigation");
             $objPagelement->setStrName("masterpathnavi");
             $objPagelement->setStrElement("navigation");
             $objPagelement->updateObjectToDb($this->strMasterID);
             $strElementId = $objPagelement->getSystemid();
             $strQuery = "UPDATE " . _dbprefix_ . "element_navigation\n                                SET navigation_id= ?,\n                                    navigation_template = ?\n                                WHERE content_id = ?";
             if ($this->objDB->_pQuery($strQuery, array($strTreeId, "breadcrumbnavi.tpl", $strElementId))) {
                 $strReturn .= "Navigation element created.\n";
             } else {
                 $strReturn .= "Error creating navigation element.\n";
             }
         }
     }
     $strReturn .= "Creating simple sitemap...\n";
     $objPage = new class_module_pages_page();
     $objPage->setStrName("sitemap");
     $objPage->setStrBrowsername("Sitemap");
     $objPage->setStrTemplate("standard.tpl");
     $objPage->updateObjectToDb();
     $strSitemapId = $objPage->getSystemid();
     $strReturn .= "ID of new page: " . $strSitemapId . "\n";
     $strReturn .= "Adding sitemap to new page\n";
     if (class_module_pages_element::getElement("navigation") != null) {
         $objPagelement = new class_module_pages_pageelement();
         $objPagelement->setStrPlaceholder("special_news|guestbook|downloads|gallery|galleryRandom|form|tellafriend|maps|search|navigation|faqs|postacomment|votings|userlist|rssfeed|tagto|portallogin|portalregistration|portalupload|directorybrowser|lastmodified|tagcloud|downloadstoplist|flash|mediaplayer|tags|eventmanager");
         $objPagelement->setStrName("special");
         $objPagelement->setStrElement("navigation");
         $objPagelement->updateObjectToDb($strSitemapId);
         $strElementId = $objPagelement->getSystemid();
         $strQuery = "UPDATE " . _dbprefix_ . "element_navigation\n                            SET navigation_id=?,\n                                navigation_template = ?\n                                WHERE content_id = ?";
         if ($this->objDB->_pQuery($strQuery, array($strTreeId, "sitemap.tpl", $strElementId))) {
             $strReturn .= "Sitemapelement created.\n";
         } else {
             $strReturn .= "Error creating sitemapelement.\n";
         }
     }
     $strReturn .= "Adding headline-element to new page\n";
     if (class_module_pages_element::getElement("row") != null) {
         $objPagelement = new class_module_pages_pageelement();
         $objPagelement->setStrPlaceholder("headline_row");
         $objPagelement->setStrName("headline");
         $objPagelement->setStrElement("row");
         $objPagelement->updateObjectToDb($strSitemapId);
         $strElementId = $objPagelement->getSystemid();
         $strQuery = "UPDATE " . _dbprefix_ . "element_paragraph\n                            SET paragraph_title = ?\n                          WHERE content_id = ? ";
         if ($this->objDB->_pQuery($strQuery, array("Sitemap", $strElementId))) {
             $strReturn .= "Headline element created.\n";
         } else {
             $strReturn .= "Error creating headline element.\n";
         }
     }
     $strReturn .= "Creating navigation points\n";
     $objNaviPoint = new class_module_navigation_point();
     $objNaviPoint->setStrName("Sitemap");
     $objNaviPoint->setStrPageI("sitemap");
     $objNaviPoint->updateObjectToDb($strTreePortalId);
     $strReturn .= "ID of new navigation point " . $objNaviPoint->getSystemid() . ".\n";
     $objNaviPoint = new class_module_navigation_point();
     if ($this->strContentLanguage == "de") {
         $objNaviPoint->setStrName("Impressum");
     } else {
         $objNaviPoint->setStrName("Imprint");
     }
     $objNaviPoint->setStrPageI("imprint");
     $objNaviPoint->updateObjectToDb($strTreePortalId);
     $strReturn .= "ID of new navigation point " . $objNaviPoint->getSystemid() . ".\n";
     return $strReturn;
 }