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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; under version 2 |
| 7 | * of the License (non-upgradable). |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | * Copyright (c) 2017 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT); |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | namespace oat\tao\model\taskQueue\Task; |
| 23 | |
| 24 | use oat\generis\model\fileReference\FileReferenceSerializer; |
| 25 | use oat\oatbox\filesystem\File; |
| 26 | |
| 27 | trait FileReferenceSerializerAwareTrait |
| 28 | { |
| 29 | /** |
| 30 | * @return FileReferenceSerializer |
| 31 | */ |
| 32 | abstract protected function getFileReferenceSerializer(); |
| 33 | |
| 34 | /** |
| 35 | * Checks if it's a serialized file reference. |
| 36 | * |
| 37 | * @param string $serial |
| 38 | * @return bool |
| 39 | */ |
| 40 | protected function isFileReferenced($serial) |
| 41 | { |
| 42 | return is_object($this->getReferencedFile($serial)); |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Tries to get the referenced file if it exists. |
| 47 | * |
| 48 | * @param string $serial |
| 49 | * @return null|File |
| 50 | */ |
| 51 | protected function getReferencedFile($serial) |
| 52 | { |
| 53 | try { |
| 54 | $file = $this->getFileReferenceSerializer()->unserialize($serial); |
| 55 | if ($file instanceof File && $file->exists()) { |
| 56 | return $file; |
| 57 | } |
| 58 | } catch (\Exception $e) { |
| 59 | // do nothing |
| 60 | } |
| 61 | |
| 62 | return null; |
| 63 | } |
| 64 | } |