protected function addAlphaList()
{
// check for letters in session
$alpha_list = $this->request->getSession("alpha_list");
if ($alpha_list == "") {
$objDataMap = new Xerxes_DataMap();
// check database cache
$arrCache = $objDataMap->getCache("dblist", "az");
if (count($arrCache) > 0) {
$objCache = $arrCache[0];
$alpha_list = $objCache->data;
} else {
// so create it
$alpha_list_array = $objDataMap->getDatabaseAlpha();
$alpha_list = implode(',', $alpha_list_array);
// and cache it in the database
$objCache = new Xerxes_Data_Cache();
$objCache->source = "dblist";
$objCache->id = "az";
$objCache->data = $alpha_list;
$objCache->expiry = time() + 60 * 60;
// for one hour
$objDataMap->setCache($objCache);
}
// cache it in session too!
$this->request->setSession("alpha_list", $alpha_list);
}
// add it to the interface
$objAlpha = new DOMDocument();
$objAlpha->loadXML("<alpha />");
foreach (explode(',', $alpha_list) as $letter) {
$objEntry = $objAlpha->createElement("entry");
$objAlpha->documentElement->appendChild($objEntry);
$objLetter = $objAlpha->createElement("letter", $letter);
$objEntry->appendChild($objLetter);
$params = array("base" => "databases", "action" => "alphabetical", "alpha" => $letter);
$link = $this->request->url_for($params);
$objLink = $objAlpha->createElement("link", Xerxes_Framework_Parser::escapeXML($link));
$objEntry->appendChild($objLink);
}
$this->request->addDocument($objAlpha);
}
