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1
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) 2020 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
19 */
20
21declare(strict_types=1);
22
23namespace oat\taoQtiItem\model\qti\parser;
24
25use oat\oatbox\service\ConfigurableService;
26use oat\taoQtiItem\model\qti\Element;
27use oat\taoQtiItem\model\qti\ElementReferences;
28use oat\taoQtiItem\model\qti\Item;
29use oat\taoQtiItem\model\qti\QtiObject;
30use oat\taoQtiItem\model\qti\XInclude;
31use oat\taoQtiItem\model\qti\Img;
32
33class ElementReferencesExtractor extends ConfigurableService
34{
35    /** @var string[] */
36    private $elementReferences;
37
38    public function extract(Item $qtiItem, string $elementClass, string $attributeName): array
39    {
40        $this->elementReferences = [];
41
42        /** @var Element $element */
43        foreach ($qtiItem->getComposingElements($elementClass) as $element) {
44            $this->elementReferences[] = $element->attr($attributeName);
45        }
46
47        return array_unique($this->elementReferences);
48    }
49
50    public function extractAll(Item $qtiItem): ElementReferences
51    {
52        return new ElementReferences(
53            $this->extract($qtiItem, XInclude::class, 'href'),
54            $this->extract($qtiItem, QtiObject::class, 'data'),
55            $this->extract($qtiItem, Img::class, 'src')
56        );
57    }
58}