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2 |
1 | <?php |
2 | |
3 | /** |
4 | * Null index field - means search engine does not implement this field. |
5 | */ |
6 | class NullIndexField implements SearchIndexField { |
7 | |
8 | /** |
9 | * Get mapping for specific search engine |
10 | * @param SearchEngine $engine |
11 | * @return array|null Null means this field does not map to anything |
12 | */ |
13 | public function getMapping( SearchEngine $engine ) { |
14 | return null; |
15 | } |
16 | |
17 | /** |
18 | * Set global flag for this field. |
19 | * |
20 | * @param int $flag Bit flag to set/unset |
21 | * @param bool $unset True if flag should be unset, false by default |
22 | * @return $this |
23 | */ |
24 | public function setFlag( $flag, $unset = false ) { |
25 | return $this; |
26 | } |
27 | |
28 | /** |
29 | * Check if flag is set. |
30 | * @param int $flag |
31 | * @return int 0 if unset, !=0 if set |
32 | */ |
33 | public function checkFlag( $flag ) { |
34 | return 0; |
35 | } |
36 | |
37 | /** |
38 | * Merge two field definitions if possible. |
39 | * |
40 | * @param SearchIndexField $that |
41 | * @return SearchIndexField|false New definition or false if not mergeable. |
42 | */ |
43 | public function merge( SearchIndexField $that ) { |
44 | return $that; |
45 | } |
46 | |
47 | /** |
48 | * @inheritDoc |
49 | */ |
50 | public function getEngineHints( SearchEngine $engine ) { |
51 | return []; |
52 | } |
53 | } |