/**
* Returns the navigation object from the post data
*
* @return Omeka_Navigation The navigation object from the post data
*/
protected function _getNavigationFromPost()
{
$nav = new Omeka_Navigation();
$nav->loadAsOption(Omeka_Navigation::PUBLIC_NAVIGATION_MAIN_OPTION_NAME);
$pageUids = array();
if ($pageLinks = $this->getValue(self::HIDDEN_ELEMENT_ID)) {
if ($pageLinks = json_decode($pageLinks, true)) {
// add and update the pages in the navigation
$pageOrder = 0;
$pages = array();
$parentPageIds = array();
$pageIdsToPageUids = array();
foreach ($pageLinks as $pageLink) {
$pageOrder++;
// add or update the page in the navigation
$pageUid = $nav->createPageUid($pageLink['uri']);
if (!($page = $nav->getPageByUid($pageUid))) {
$page = new Omeka_Navigation_Page_Uri();
$page->setHref($pageLink['uri']);
// this sets both the uri and the fragment
$page->set('uid', $pageUid);
}
$page->setLabel($pageLink['label']);
$page->set('can_delete', (bool) $pageLink['can_delete']);
$page->setVisible($pageLink['visible']);
$page->setOrder($pageOrder);
$parentPageIds[] = $pageLink['parent_id'];
$pageUids[] = $page->uid;
$pages[] = $page;
$pageIdsToPageUids[strval($pageLink['id'])] = $page->uid;
}
// structure the parent/child relationships
// this assumes that the $pages are in a flattened hierarchical order
for ($i = 0; $i < $pageOrder; $i++) {
$page = $pages[$i];
$page->removePages();
// remove old children pages
$parentPageId = $parentPageIds[$i];
if ($parentPageId === null || !array_key_exists($parentPageId, $pageIdsToPageUids)) {
// add a page that lacks a parent
$nav->addPage($page);
} else {
// add a child page to its parent page
// we assume that all parents already exist in the navigation
$parentPageUid = $pageIdsToPageUids[$parentPageId];
if (!($parentPage = $nav->getPageByUid($parentPageUid))) {
throw new RuntimeException(__("Cannot find parent navigation page."));
} else {
$parentPage->addPage($page);
}
}
}
}
}
// prune the remaining expired pages from navigation
$otherPages = $nav->getOtherPages($pageUids);
$expiredPages = array();
foreach ($otherPages as $otherPage) {
$nav->prunePage($otherPage);
}
return $nav;
}
