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1 | <?php |
2 | |
3 | namespace CirrusSearch\Search\Rescore; |
4 | |
5 | use CirrusSearch\SearchConfig; |
6 | use Elastica\Query\FunctionScore; |
7 | |
8 | /** |
9 | * simple log(factor*field+2)^impact |
10 | * Useful to control the impact when applied in a multiplication. |
11 | */ |
12 | class LogMultFunctionScoreBuilder extends FunctionScoreBuilder { |
13 | /** @var float */ |
14 | private $impact; |
15 | /** @var float */ |
16 | private $factor; |
17 | /** @var string */ |
18 | private $field; |
19 | |
20 | /** |
21 | * @param SearchConfig $config |
22 | * @param float $weight |
23 | * @param array $profile |
24 | * @throws InvalidRescoreProfileException |
25 | */ |
26 | public function __construct( SearchConfig $config, $weight, $profile ) { |
27 | parent::__construct( $config, $weight ); |
28 | if ( isset( $profile['impact'] ) ) { |
29 | $this->impact = $this->getOverriddenFactor( $profile['impact'] ); |
30 | if ( $this->impact <= 0 ) { |
31 | throw new InvalidRescoreProfileException( 'Param impact must be > 0' ); |
32 | } |
33 | } else { |
34 | throw new InvalidRescoreProfileException( 'Param impact is mandatory' ); |
35 | } |
36 | |
37 | if ( isset( $profile['factor'] ) ) { |
38 | $this->factor = $this->getOverriddenFactor( $profile['factor'] ); |
39 | if ( $this->factor <= 0 ) { |
40 | throw new InvalidRescoreProfileException( 'Param factor must be > 0' ); |
41 | } |
42 | } else { |
43 | $this->factor = 1; |
44 | } |
45 | |
46 | if ( isset( $profile['field'] ) ) { |
47 | $this->field = $profile['field']; |
48 | } else { |
49 | throw new InvalidRescoreProfileException( 'Param field is mandatory' ); |
50 | } |
51 | } |
52 | |
53 | public function append( FunctionScore $functionScore ) { |
54 | $formula = "pow(log10({$this->factor} * doc['{$this->field}'].value + 2), {$this->impact})"; |
55 | $functionScore->addScriptScoreFunction( new \Elastica\Script\Script( $formula, null, |
56 | 'expression' ), null, $this->weight ); |
57 | } |
58 | } |