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<?php namespace Nord\Lumen\Elasticsearch\Search\Scoring\Functions; |
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use Nord\Lumen\Elasticsearch\Search\Traits\HasField; |
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/** |
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* Decay functions score a document with a function that decays depending on the distance of a numeric field value of |
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* the document from a user given origin. This is similar to a range query, but with smooth edges instead of boxes. |
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* |
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* @see https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html#function-decay |
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*/ |
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class DecayScoringFunction extends AbstractScoringFunction |
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{ |
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use HasField; |
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public const DECAY_FUNCTION_LINEAR = 'linear'; |
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public const DECAY_FUNCTION_EXPONENTIAL = 'exp'; |
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public const DECAY_FUNCTION_GAUSSIAN = 'gauss'; |
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/** |
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* @var string One of the `DECAY_FUNCTION_` constants. |
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*/ |
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private $decayFunction; |
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/** |
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* @var mixed The point of origin used for calculating distance. Must be given as a number for numeric field, date |
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* for date fields and geo point for geo fields. Required for geo and numeric field. For date fields the default is |
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* now. Date math (for example now-1h) is supported for origin. |
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*/ |
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private $origin; |
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/** |
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* @var mixed Required for all types. Defines the distance from origin at which the computed score will equal decay |
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* parameter. For geo fields: Can be defined as number+unit (1km, 12m,…). Default unit is meters. For date fields: |
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* Can to be defined as a number+unit ("1h", "10d",…). Default unit is milliseconds. For numeric field: Any number. |
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*/ |
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private $scale; |
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/** |
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* @var mixed If an offset is defined, the decay function will only compute the decay function for documents with a |
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* distance greater that the defined offset. The default is 0. |
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*/ |
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private $offset; |
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/** |
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* @var mixed The decay parameter defines how documents are scored at the distance given at scale. If no decay is |
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* defined, documents at the distance scale will be scored 0.5. |
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*/ |
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private $decay; |
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/** |
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* @inheritdoc |
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*/ |
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public function toArray() |
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{ |
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$options = [ |
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'origin' => $this->getOrigin(), |
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'scale' => $this->getScale(), |
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]; |
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$offset = $this->getOffset(); |
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if (!empty($offset)) { |
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$options['offset'] = $offset; |
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} |
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$decay = $this->getDecay(); |
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if (!empty($decay)) { |
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$options['decay'] = $decay; |
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} |
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return [ |
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$this->getDecayFunction() => [ |
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$this->getField() => $options |
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], |
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]; |
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} |
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/** |
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* @return string |
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*/ |
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public function getDecayFunction() |
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{ |
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return $this->decayFunction; |
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} |
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/** |
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* @param string $decayFunction |
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* @return DecayScoringFunction |
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*/ |
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public function setDecayFunction($decayFunction) |
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{ |
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$this->decayFunction = $decayFunction; |
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return $this; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getOrigin() |
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{ |
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return $this->origin; |
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} |
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/** |
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* @param mixed $origin |
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* @return DecayScoringFunction |
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*/ |
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public function setOrigin($origin) |
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{ |
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$this->origin = $origin; |
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return $this; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getScale() |
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{ |
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return $this->scale; |
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} |
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/** |
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* @param mixed $scale |
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* @return DecayScoringFunction |
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*/ |
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public function setScale($scale) |
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{ |
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$this->scale = $scale; |
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return $this; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getOffset() |
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{ |
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return $this->offset; |
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} |
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/** |
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* @param mixed $offset |
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* @return DecayScoringFunction |
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*/ |
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public function setOffset($offset) |
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{ |
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$this->offset = $offset; |
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return $this; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getDecay() |
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{ |
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return $this->decay; |
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} |
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/** |
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* @param mixed $decay |
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* @return DecayScoringFunction |
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*/ |
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public function setDecay($decay) |
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{ |
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$this->decay = $decay; |
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return $this; |
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} |
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} |
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digiaonline /
lumen-elasticsearch
