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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) 2022 (original work) Open Assessment Technologies SA. |
| 19 | */ |
| 20 | |
| 21 | declare(strict_types=1); |
| 22 | |
| 23 | namespace oat\tao\model\StatisticalMetadata\Import\Extractor; |
| 24 | |
| 25 | use oat\tao\model\StatisticalMetadata\Contract\Header; |
| 26 | |
| 27 | class MetadataAliasesExtractor |
| 28 | { |
| 29 | /** @var MetadataHeadersExtractor */ |
| 30 | private $metadataHeadersExtractor; |
| 31 | |
| 32 | /** @var array */ |
| 33 | private $cache = []; |
| 34 | |
| 35 | public function __construct(MetadataHeadersExtractor $metadataHeadersExtractor) |
| 36 | { |
| 37 | $this->metadataHeadersExtractor = $metadataHeadersExtractor; |
| 38 | } |
| 39 | |
| 40 | public function extract(array $header): array |
| 41 | { |
| 42 | $hash = $this->getHash($header); |
| 43 | |
| 44 | if (!isset($this->cache[$hash])) { |
| 45 | $this->cache[$hash] = $this->extractAliases($this->metadataHeadersExtractor->extract($header)); |
| 46 | } |
| 47 | |
| 48 | return $this->cache[$hash]; |
| 49 | } |
| 50 | |
| 51 | private function getHash(array $header): string |
| 52 | { |
| 53 | sort($header); |
| 54 | |
| 55 | return hash('sha256', json_encode($header)); |
| 56 | } |
| 57 | |
| 58 | private function extractAliases(array $metadata): array |
| 59 | { |
| 60 | $aliases = []; |
| 61 | |
| 62 | foreach ($metadata as $metadatum) { |
| 63 | $aliases[] = str_replace(Header::METADATA_PREFIX, '', $metadatum); |
| 64 | } |
| 65 | |
| 66 | return $aliases; |
| 67 | } |
| 68 | } |