events/Classes/Service/CategoryService.php

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<?php
namespace Wrm\Events\Service;
use TYPO3\CMS\Core\Cache\CacheManager;
use TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
use TYPO3\CMS\Core\Database\Connection;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\TimeTracker\TimeTracker;
use TYPO3\CMS\Core\Utility\GeneralUtility;
class CategoryService
{
/** @var TimeTracker */
protected $timeTracker;
/** @var FrontendInterface */
protected $cache;
public function __construct()
{
$this->timeTracker = GeneralUtility::makeInstance(TimeTracker::class);
$this->cache = GeneralUtility::makeInstance(CacheManager::class)->getCache('cache_Events_category');
}
/**
* Get child categories by calling recursive function
* and using the caching framework to save some queries
*
* @param string $idList list of category ids to start
* @param int $counter
* @return string comma separated list of category ids
*/
public function getChildrenCategories($idList, int $counter = 0)
{
$cacheIdentifier = sha1('children' . $idList);
$entry = $this->cache->get($cacheIdentifier);
if (!$entry) {
$entry = $this->getChildrenCategoriesRecursive($idList, $counter);
$this->cache->set($cacheIdentifier, $entry);
}
return $entry;
}
/**
* Get child categories
*
* @param string $idList list of category ids to start
* @param int $counter
* @return string comma separated list of category ids
*/
protected function getChildrenCategoriesRecursive($idList, $counter = 0): string
{
$result = [];
// add id list to the output
if ($counter === 0) {
$newList = $this->getUidListFromRecords($idList);
if ($newList) {
$result[] = $newList;
}
}
$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
->getQueryBuilderForTable('sys_category');
$res = $queryBuilder
->select('uid')
->from('sys_category')
->where(
$queryBuilder->expr()->in('parent', $queryBuilder->createNamedParameter(explode(',', $idList), Connection::PARAM_INT_ARRAY))
)
->execute();
while ($row = $res->fetch()) {
$counter++;
if ($counter > 10000) {
$this->timeTracker->setTSlogMessage('EXT:dd_events: one or more recursive categories where found');
return implode(',', $result);
}
$subcategories = $this->getChildrenCategoriesRecursive($row['uid'], $counter);
$result[] = $row['uid'] . ($subcategories ? ',' . $subcategories : '');
}
$result = implode(',', $result);
return $result;
}
/**
* Fetch ids again from DB to avoid false positives
*
* @param string $idList
* @return string
*/
protected function getUidListFromRecords(string $idList): string
{
$list = [];
$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
->getQueryBuilderForTable('sys_category');
$rows = $queryBuilder
->select('uid')
->from('sys_category')
->where(
$queryBuilder->expr()->in('uid', $queryBuilder->createNamedParameter(explode(',', $idList), Connection::PARAM_INT_ARRAY))
)
->execute()
->fetchAll();
foreach ($rows as $row) {
$list[] = $row['uid'];
}
return implode(',', $list);
}
}