FLOW TYPO3 Collection

use TYPO3\Flow\Annotations as Flow;
use \TYPO3\Flow\Persistence\QueryInterface;
use \TYPO3\Fluid\View\TemplateView;
use \TYPO3\Flow\Property\TypeConverter\DateTimeConverter;
use \Doctrine\Common\Collections\Collection;    <<<<< does it exist?
use \Doctrine\Common\Collections\ArrayCollection;


    (think of Crono as Blog, Evento as Post, Categoria as Category (of posts))
$newFile: each file line contains data defining an Evento obj:
                        title#descrption#comment#dateBegin#dataEnd#catA:catB

    /**
     * Adds the given new collection of Evento objects to the Evento repository
     *
         * @param \Mario\Crono\Domain\Model\Crono $crono
         * @param array $newFile                          <<<< why do I need Array (I upload a single file)?
     * @return void
     */
    public function createbulkAction(\Mario\Crono\Domain\Model\Crono $crono,  array $newFile) {

// thanks to http://www.layh.com/typo3-flow-tutorials/file-resources/comment-page-1/#comment-85622

        $fileResource = $this->resourceManager->importUploadedResource($newFile);
        $uri = $fileResource->getUri();
        // read file
        $csvLines = array();
        $fHandle = \fopen($uri, 'r');
        if ($fHandle) {
        while (($buffer = \fgets($fHandle, 4096)) !== false) {
            $csvLines[] = $buffer;
        }}
       \fclose($fHandle);

    foreach($csvLines as $recordString){
        \TYPO3\FLOW\var_dump($recordString);
                $recordArr = explode("#", trim($recordString));
             $evento = new \Mario\Crono\Domain\Model\Evento();
             $evento->setCrono($crono);
                     $evento->setTitolo($recordArr[0]);
             $evento->setDescrizione($recordArr[1]);
                     $evento->setCommento($recordArr[2]);

        $propertyMappingConfiguration = new \TYPO3\Flow\Property\PropertyMappingConfiguration();
        $propertyMappingConfiguration->forProperty('datainizio')->setTypeConverterOption(
                         'TYPO3\Flow\Property\TypeConverter\DateTimeConverter',
                         \TYPO3\Flow\Property\TypeConverter\DateTimeConverter::CONFIGURATION_DATE_FORMAT,
                          'Y-m-d');


                  $dataInizio = $this->propertyMapper->convert($recordArr[3], 'DateTime');
                  $dataFine = $this->propertyMapper->convert($recordArr[4], 'DateTime');
                  $evento->setDatainizio($dataInizio);
                  $evento->setDatafine($dataFine);
/// SET CATEGORIE .
                 $categorias = new \Doctrine\Common\Collections\ArrayCollection;
         $evento->setCategorias($categorias);
<<< I define a empty collection of categories and set to the object

         $catArr = explode(":", trim($recordArr[5]));

foreach($catArr as $cat){$catObj = $this->categoriaRepository->findBySigla($cat)->getFirst();  $evento->addCategorias($catObj); }   //

                 $this->eventoRepository->add($evento);
                  $crono->addEvento($evento);
                  $this->cronoRepository->update($crono);
}

                $this->addFlashMessage('Created many new  Evento(s)');
                $this->redirect('index', 'Evento', NULL, array('crono' => $crono));

}