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) {
$breadcrumbs = islandora_get_breadcrumbs_recursive($object->id, $object->repository);
array_pop($breadcrumbs);
return $breadcrumbs;
}
/**
* Builds an array of drupal links for use in breadcrumbs.
*
* @todo Make fully recursive...
*
* @param string $pid
* The object id whose parent will be fetched for the next link.
* @param FedoraRepository $repository
* The fedora repository.
* @param array $context
* An associative array of context for internal use when recursing. Currently
* only used to track a single value:
* - level: The number of child-parent relationships to follow. Defaults to
* 10.
*
* @return array
* An array of links representing the breadcrumb trail, "root" first.
*/
function islandora_get_breadcrumbs_recursive($pid, FedoraRepository $repository, array &$context = NULL) {
// Before executing the query, we have a base case of accessing the top-level
// collection.
if ($context === NULL) {
$context['level'] = 10;
}
$root = variable_get('islandora_repository_pid', 'islandora:root');
if ($pid == $root) {
$item = menu_get_item('islandora');
return array(
l(t('Home'), '<front>'),
l($item['title'], 'islandora'),
);
}
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>
minus $parentObject <mulgara:is> <info:fedora/' . $pid . '>
order by $title desc';
$results = $repository->ri->itqlQuery($query_string);
if (count($results) > 0 && $context['level'] > 0) {
$parent = $results[0]['parentObject']['value'];
$this_title = $results[0]['title']['value'];
if (empty($this_title)) {
$this_title = t('-');
}
$context['level']--;
return array_merge(
islandora_get_breadcrumbs_recursive($parent, $repository, $context),
array(
l($this_title, "islandora/object/$pid"),
)
);
}
else {
// Add an non-link, as we don't know how to get back to the root, and
// render the last two links and break (on the next pass).
return array_merge(
islandora_get_breadcrumbs_recursive($root, $repository, $context),
array(
'...',
)
);
}
}
}