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1 | <?php |
2 | |
3 | namespace Flow\Data\Utils; |
4 | |
5 | use Flow\Exception\InvalidParameterException; |
6 | use Flow\Model\AbstractRevision; |
7 | |
8 | /** |
9 | * Sorts AbstractRevision objects by revision ID |
10 | */ |
11 | class SortRevisionsByRevisionId { |
12 | /** |
13 | * Order, either ASC or DESC. |
14 | * |
15 | * @var string |
16 | */ |
17 | protected $order; |
18 | |
19 | /** |
20 | * @param string $order ASC or DESC |
21 | * @throws InvalidParameterException |
22 | */ |
23 | public function __construct( $order ) { |
24 | if ( $order !== 'ASC' && $order !== 'DESC' ) { |
25 | throw new InvalidParameterException( "Must specify ASC or DESC" ); |
26 | } |
27 | |
28 | $this->order = $order; |
29 | } |
30 | |
31 | /** |
32 | * Compares two revisions |
33 | * |
34 | * @param AbstractRevision $a |
35 | * @param AbstractRevision $b |
36 | * @return int |
37 | */ |
38 | public function __invoke( AbstractRevision $a, AbstractRevision $b ) { |
39 | $aId = $a->getRevisionId()->getAlphadecimal(); |
40 | $bId = $b->getRevisionId()->getAlphadecimal(); |
41 | |
42 | if ( $aId < $bId ) { |
43 | $result = -1; |
44 | } elseif ( $aId > $bId ) { |
45 | $result = 1; |
46 | } else { |
47 | $result = 0; |
48 | } |
49 | |
50 | if ( $this->order === 'ASC' ) { |
51 | return $result; |
52 | } else { |
53 | return -$result; |
54 | } |
55 | } |
56 | } |