RecordService.php

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<?php
namespace TYPO3\CMS\Workspaces\Service;

use TYPO3\CMS\Workspaces\Domain\Model\DatabaseRecord;

class RecordService implements \TYPO3\CMS\Core\SingletonInterface
{
    protected $records = array();

    public function add($tableName, $id)
    {
        $databaseRecord = DatabaseRecord::create($tableName, $id);
        if (!isset($this->records[$databaseRecord->getIdentifier()])) {
            $this->records[$databaseRecord->getIdentifier()] = $databaseRecord;
        }
    }

    public function getIdsPerTable()
    {
        $idsPerTable = array();
        foreach ($this->records as $databaseRecord) {
            if (!isset($idsPerTable[$databaseRecord->getTable()])) {
                $idsPerTable[$databaseRecord->getTable()] = array();
            }
            $idsPerTable[$databaseRecord->getTable()][] = $databaseRecord->getUid();
        }
        return $idsPerTable;
    }

    public function getCreateUserIds()
    {
        $createUserIds = array();
        foreach ($this->getIdsPerTable() as $tableName => $ids) {
            if (empty($GLOBALS['TCA'][$tableName]['ctrl']['cruser_id'])) {
                continue;
            }
            $createUserIdFieldName = $GLOBALS['TCA'][$tableName]['ctrl']['cruser_id'];
            $records = $this->getDatabaseConnection()->exec_SELECTgetRows(
                $createUserIdFieldName, $tableName,
                'uid IN (' . implode(',', $ids) . ')',
                $createUserIdFieldName,
                '', '',
                $createUserIdFieldName
            );
            if (!empty($records)) {
                $createUserIds = array_merge($createUserIds, array_keys($records));
            }
        }
        return array_unique($createUserIds);
    }

    protected function getDatabaseConnection()
    {
        return $GLOBALS['TYPO3_DB'];
    }
}