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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) 2020 (original work) Open Assessment Technologies SA;
19 */
20
21declare(strict_types=1);
22
23namespace oat\tao\model\resources\relation;
24
25use ArrayIterator;
26use IteratorAggregate;
27use JsonSerializable;
28
29class ResourceRelationCollection implements IteratorAggregate, JsonSerializable
30{
31    /** @var ResourceRelation[] */
32    private $relations = [];
33
34    public function __construct(ResourceRelation ...$relations)
35    {
36        foreach ($relations as $relation) {
37            $this->add($relation);
38        }
39    }
40
41    public function getIterator(): ArrayIterator
42    {
43        return new ArrayIterator($this->relations);
44    }
45
46    public function add(ResourceRelation $relation): self
47    {
48        $this->relations[] = $relation;
49
50        return $this;
51    }
52
53    public function filterNewSourceIds(array $currentSourceIds): array
54    {
55        return array_diff($currentSourceIds, $this->getSourceIds());
56    }
57
58    public function filterRemovedSourceIds(array $currentSourceIds): array
59    {
60        return array_diff($this->getSourceIds(), $currentSourceIds);
61    }
62
63    public function jsonSerialize(): array
64    {
65        return $this->relations;
66    }
67
68    private function getSourceIds(): array
69    {
70        $sourceIds = [];
71
72        foreach ($this->relations as $relation) {
73            $sourceIds[] = $relation->getSourceId();
74        }
75
76        return $sourceIds;
77    }
78}