Drupal modules for browsing and managing Fedora-based digital repositories.
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<?php
/**
* @file
*
* This file contains functions to create breadcrumbs on Islandora object pages.
*/
/**
* Get an array of links to be passed to drupal_set_breadcrumb(). This is used for generating the bread-crumbs for the view object page.
*
* Each link in the bread-crumbs represents a member of the given objects ancestry
* which is identified by any of the following RELS-EXT terms (isMemberOf,isMemberOfCollection,isPartOf).
*
* @param FedoraObject $object
* An object whose ancestry will be mapped to bread-crumbs.
*
* @see drupal_set_breadcrumb()
*
* @return array
* Array of links, starting with most distant ancestor proceeding up to but not including the given object. For use in the function drupal_set_breadcrumb().
*/
function islandora_get_breadcrumbs($object) {
$breadcrumbs = array();
islandora_get_breadcrumbs_recursive($object->id, $breadcrumbs, $object->repository);
if (isset($breadcrumbs[0])) { // Remove the actual object.
unset($breadcrumbs[0]);
}
$breadcrumbs = array_reverse($breadcrumbs);
return $breadcrumbs;
}
/**
* Builds an array of drupal links for use in breadcrumbs.
*
* @todo Make fully recursive...
*
* @todo Could use some clean up, can't be called multiple times safely due to the use of static variables.
*
* @param string $pid
* THe object id whose parent will be fetched for the next link.
* @param array $breadcrumbs
* The list of existing bread-crumb links in reverse order.
* @param FedoraRepository $repository
* The fedora repository.
*/
function islandora_get_breadcrumbs_recursive($pid, array &$breadcrumbs, FedoraRepository $repository) {
// Before executing the query, we hve a base case of accessing the top-level collection
static $max_level = 10;
static $level = -1;
if (count($breadcrumbs) === 0) {
$level = $max_level;
}
$root = variable_get('islandora_repository_pid', 'islandora:root');
if ($pid == $root) {
$breadcrumbs[] = l(menu_get_active_title(), 'islandora');
$breadcrumbs[] = l(t('Home'), '<front>');
}
else {
$query_string = 'select $parentObject $title $content from <#ri>
where (
<info:fedora/' . $pid . '> <fedora-model:label> $title
and $parentObject <fedora-model:hasModel> $content
and (
<info:fedora/' . $pid . '> <fedora-rels-ext:isMemberOfCollection> $parentObject
or <info:fedora/' . $pid . '> <fedora-rels-ext:isMemberOf> $parentObject
or <info:fedora/' . $pid . '> <fedora-rels-ext:isPartOf> $parentObject
)
and $parentObject <fedora-model:state> <info:fedora/fedora-system:def/model#Active>
)
minus $content <mulgara:is> <info:fedora/fedora-system:FedoraObject-3.0>
order by $title desc';
$results = $repository->ri->itqlQuery($query_string);
if (count($results) > 0 && $level > 0) {
$parent = $results[0]['parentObject']['value'];
$this_title = $results[0]['title']['value'];
if (empty($this_title)) {
$this_title = t('-');
}
$breadcrumbs[] = l($this_title, "islandora/object/$pid");
$level--;
islandora_get_breadcrumbs_recursive($parent, $breadcrumbs, $repository);
}
else {
$breadcrumbs[] = '...'; // Add an non-link, as we don't know how to get back to the root.
islandora_get_breadcrumbs_recursive($root, $breadcrumbs, $repository); // And render the last two links and break (on the next pass).
}
}
}