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7 |
1 | <?php |
2 | |
3 | namespace WikibaseQuality\ConstraintReport\ConstraintCheck; |
4 | |
5 | use DomainException; |
6 | use InvalidArgumentException; |
7 | use Wikibase\DataModel\Entity\EntityIdValue; |
8 | use Wikibase\DataModel\Entity\ItemId; |
9 | use Wikibase\DataModel\Snak\PropertyNoValueSnak; |
10 | use Wikibase\DataModel\Snak\PropertySomeValueSnak; |
11 | use Wikibase\DataModel\Snak\PropertyValueSnak; |
12 | use Wikibase\DataModel\Snak\Snak; |
13 | |
14 | /** |
15 | * A value that can either be an item ID, some value (unknown value), or no value. |
16 | * |
17 | * @author Lucas Werkmeister |
18 | * @license GPL-2.0-or-later |
19 | */ |
20 | class ItemIdSnakValue { |
21 | |
22 | /** |
23 | * @var ItemId|null |
24 | */ |
25 | private $itemId = null; |
26 | |
27 | /** |
28 | * @var bool |
29 | */ |
30 | private $some = false; |
31 | |
32 | /** |
33 | * @var bool |
34 | */ |
35 | private $no = false; |
36 | |
37 | private function __construct() { |
38 | } |
39 | |
40 | /** |
41 | * Get an {@link ItemIdSnakValue} from the given $itemId. |
42 | * |
43 | * @param ItemId $itemId |
44 | * @return self |
45 | */ |
46 | public static function fromItemId( ItemId $itemId ) { |
47 | $ret = new self; |
48 | $ret->itemId = $itemId; |
49 | return $ret; |
50 | } |
51 | |
52 | /** |
53 | * Get an {@link ItemIdSnakValue} that wraps an unknown value. |
54 | * |
55 | * @return self |
56 | */ |
57 | public static function someValue() { |
58 | $ret = new self; |
59 | $ret->some = true; |
60 | return $ret; |
61 | } |
62 | |
63 | /** |
64 | * Get an {@link ItemIdSnakValue} that wraps no value. |
65 | * |
66 | * @return self |
67 | */ |
68 | public static function noValue() { |
69 | $ret = new self; |
70 | $ret->no = true; |
71 | return $ret; |
72 | } |
73 | |
74 | /** |
75 | * Get an {@link ItemIdSnakValue} that matches the given snak. |
76 | * |
77 | * @param Snak $snak |
78 | * |
79 | * @throws InvalidArgumentException |
80 | * @return self |
81 | */ |
82 | public static function fromSnak( Snak $snak ) { |
83 | switch ( true ) { |
84 | case $snak instanceof PropertyValueSnak: |
85 | $dataValue = $snak->getDataValue(); |
86 | if ( $dataValue instanceof EntityIdValue ) { |
87 | $itemId = $dataValue->getEntityId(); |
88 | if ( $itemId instanceof ItemId ) { |
89 | return self::fromItemId( $itemId ); |
90 | } |
91 | } |
92 | break; |
93 | case $snak instanceof PropertySomeValueSnak: |
94 | return self::someValue(); |
95 | case $snak instanceof PropertyNoValueSnak: |
96 | return self::noValue(); |
97 | } |
98 | |
99 | throw new InvalidArgumentException( 'Snak must contain item ID value or be a somevalue / novalue snak' ); |
100 | } |
101 | |
102 | /** |
103 | * Check whether this {@link ItemIdSnakValue} contains a known value or not. |
104 | * |
105 | * @return bool |
106 | */ |
107 | public function isValue() { |
108 | return $this->itemId !== null; |
109 | } |
110 | |
111 | /** |
112 | * Check whether this {@link ItemIdSnakValue} contains an unknown value or not. |
113 | * |
114 | * @return bool |
115 | */ |
116 | public function isSomeValue() { |
117 | return $this->some; |
118 | } |
119 | |
120 | /** |
121 | * Check whether this {@link ItemIdSnakValue} contains no value or not. |
122 | * |
123 | * @return bool |
124 | */ |
125 | public function isNoValue() { |
126 | return $this->no; |
127 | } |
128 | |
129 | /** |
130 | * Get the item ID contained in this {@link ItemIdSnakValue}. |
131 | * Only valid if {@link isValue} is true. |
132 | * |
133 | * @throws DomainException if this value does not contain an item ID |
134 | * @return ItemId |
135 | */ |
136 | public function getItemId() { |
137 | if ( !$this->isValue() ) { |
138 | throw new DomainException( 'This value does not contain an item ID.' ); |
139 | } |
140 | return $this->itemId; |
141 | } |
142 | |
143 | /** |
144 | * Check whether this value matches the given $snak |
145 | * (same kind and, if contains known value, same value). |
146 | * |
147 | * @param Snak $snak |
148 | * @return bool |
149 | */ |
150 | public function matchesSnak( Snak $snak ) { |
151 | switch ( true ) { |
152 | case $snak instanceof PropertyValueSnak: |
153 | $dataValue = $snak->getDataValue(); |
154 | return $this->isValue() && |
155 | $dataValue instanceof EntityIdValue && |
156 | $dataValue->getEntityId() instanceof ItemId && |
157 | $dataValue->getEntityId()->equals( $this->getItemId() ); |
158 | case $snak instanceof PropertySomeValueSnak: |
159 | return $this->isSomeValue(); |
160 | case $snak instanceof PropertyNoValueSnak: |
161 | return $this->isNoValue(); |
162 | } |
163 | } |
164 | |
165 | } |