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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
21declare(strict_types=1);
22
23namespace oat\tao\model\StatisticalMetadata\Import\Extractor;
24
25use oat\tao\model\StatisticalMetadata\Contract\Header;
26
27class MetadataHeadersExtractor
28{
29    /** @var array */
30    private $cache = [];
31
32    public function extract(array $header): array
33    {
34        $hash = $this->getHash($header);
35
36        if (!isset($this->cache[$hash])) {
37            $metadata = preg_grep(
38                sprintf('/^%s\w/', Header::METADATA_PREFIX),
39                $header
40            );
41            $this->cache[$hash] = array_values($metadata);
42        }
43
44        return $this->cache[$hash];
45    }
46
47    private function getHash(array $header): string
48    {
49        sort($header);
50
51        return hash('sha256', json_encode($header));
52    }
53}