/**
* Generate HAL links for a paginated collection
*
* @param Collection $halCollection
* @return boolean
*/
protected function injectPaginationLinks(Collection $halCollection)
{
$collection = $halCollection->getCollection();
$page = $halCollection->getPage();
$pageSize = $halCollection->getPageSize();
$route = $halCollection->getCollectionRoute();
$params = $halCollection->getCollectionRouteParams();
$options = $halCollection->getCollectionRouteOptions();
$collection->setItemCountPerPage($pageSize);
$collection->setCurrentPageNumber($page);
$count = count($collection);
if (!$count) {
return true;
}
if ($page < 1 || $page > $count) {
return new ApiProblem(409, 'Invalid page provided');
}
$links = $halCollection->getLinks();
$next = $page < $count ? $page + 1 : false;
$prev = $page > 1 ? $page - 1 : false;
// self link
$link = new Link('self');
$link->setRoute($route);
$link->setRouteParams($params);
$link->setRouteOptions(ArrayUtils::merge($options, ['query' => ['page' => $page]]));
$links->add($link, true);
// first link
$link = new Link('first');
$link->setRoute($route);
$link->setRouteParams($params);
$link->setRouteOptions(ArrayUtils::merge($options, ['query' => ['page' => null]]));
$links->add($link);
// last link
$link = new Link('last');
$link->setRoute($route);
$link->setRouteParams($params);
$link->setRouteOptions(ArrayUtils::merge($options, ['query' => ['page' => $count]]));
$links->add($link);
// prev link
if ($prev) {
$link = new Link('prev');
$link->setRoute($route);
$link->setRouteParams($params);
$link->setRouteOptions(ArrayUtils::merge($options, ['query' => ['page' => $prev]]));
$links->add($link);
}
// next link
if ($next) {
$link = new Link('next');
$link->setRoute($route);
$link->setRouteParams($params);
$link->setRouteOptions(ArrayUtils::merge($options, ['query' => ['page' => $next]]));
$links->add($link);
}
return true;
}
private function createPaginationLink($relation, Collection $halCollection, $page = null)
{
$options = ArrayUtils::merge($halCollection->getCollectionRouteOptions(), ['query' => ['page' => $page]]);
return Link::factory(['rel' => $relation, 'route' => ['name' => $halCollection->getCollectionRoute(), 'params' => $halCollection->getCollectionRouteParams(), 'options' => $options]]);
}
