FolderBasedFileCollection.php

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<?php
namespace TYPO3\CMS\Core\Resource\Collection;

class FolderBasedFileCollection extends \TYPO3\CMS\Core\Resource\Collection\AbstractFileCollection {

    static protected $storageTableName = 'sys_file_collection';

    static protected $type = 'folder';

    static protected $itemsCriteriaField = 'folder';

    protected $folder;

    public function loadContents() {
        if ($this->folder instanceof \TYPO3\CMS\Core\Resource\Folder) {
            $entries = $this->folder->getFiles();
            foreach ($entries as $entry) {
                $this->add($entry);
            }
        }
    }

    public function getItemsCriteria() {
        return $this->folder->getCombinedIdentifier();
    }

    protected function getPersistableDataArray() {
        return array(
            'title' => $this->getTitle(),
            'type' => self::$type,
            'description' => $this->getDescription(),
            'folder' => $this->folder->getIdentifier(),
            'storage' => $this->folder->getStorage()->getUid()
        );
    }

    public function fromArray(array $array) {
        $this->uid = $array['uid'];
        $this->title = $array['title'];
        $this->description = $array['description'];
        if (!empty($array['folder']) && !empty($array['storage'])) {
            $storageRepository = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Resource\\StorageRepository');
            $storage = $storageRepository->findByUid($array['storage']);
            if ($storage) {
                $this->folder = $storage->getFolder($array['folder']);
            }
        }
    }

}