BackendModuleRepository.php

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<?php
namespace TYPO3\CMS\Backend\Domain\Repository\Module;

class BackendModuleRepository implements \TYPO3\CMS\Core\SingletonInterface {

    protected $moduleMenu;

    public function __construct() {
        $this->moduleMenu = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Backend\\Module\\ModuleStorage');
    }

    public function findByModuleName($name) {
        $entries = $this->moduleMenu->getEntries();
        $entry = $this->findByModuleNameInGivenEntries($name, $entries);
        return $entry;
    }

    public function findByModuleNameInGivenEntries($name, \SplObjectStorage $entries) {
        foreach ($entries as $entry) {
            if ($entry->getName() === $name) {
                return $entry;
            }
            $children = $entry->getChildren();
            if (count($children) > 0) {
                $childRecord = $this->findByModuleNameInGivenEntries($name, $children);
                if ($childRecord !== FALSE) {
                    return $childRecord;
                }
            }
        }
        return FALSE;
    }

}