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<?php |
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namespace Vctls\IntervalGraph; |
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use Closure; |
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/** |
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* Aggregate values through `array_reduce`. |
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* |
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* @package Vctls\IntervalGraph |
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*/ |
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class ArrayReduceAggregator implements AggregatorInterface |
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{ |
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/** @var Closure Aggregate interval values. */ |
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protected $aggregateFunction; |
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/** |
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* @return Closure |
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*/ |
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public function getAggregateFunction(): Closure |
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{ |
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return $this->aggregateFunction; |
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} |
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/** |
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* Define the function to aggregate interval values. |
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* |
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* @param Closure $aggregate |
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* @return ArrayReduceAggregator |
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*/ |
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public function setAggregateFunction(Closure $aggregate): AggregatorInterface |
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{ |
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$this->aggregateFunction = $aggregate; |
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return $this; |
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} |
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public function __construct() |
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{ |
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$this->aggregateFunction = static function ($a, $b) { |
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if ($a === null && $b === null) { |
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return null; |
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} |
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return round($a + $b, 2); |
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}; |
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} |
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/** |
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* Walk through an array of adjacent intervals, and compute the aggregated values |
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* from the values of the corresponding original intervals. |
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* |
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* @param array $adjacentIntervals |
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* @param array $originalIntervals |
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* @return array |
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*/ |
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public function aggregate(array $adjacentIntervals, array $originalIntervals): array |
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{ |
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$originalValues = []; |
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// Get the values of the original intervals, including nulls. |
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foreach ($originalIntervals as $i => $interval) { |
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$originalValues[$i] = $interval[2] ?? null; |
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} |
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// If no intervals are active on this bound, |
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// the value of this interval is null. |
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// Else, aggregate the values of the corresponding intervals. |
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foreach ($adjacentIntervals as $key => $adjacentInterval) { |
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if (empty($adjacentInterval[2])) { |
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$adjacentIntervals[$key][2] = null; |
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} else { |
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$adjacentIntervals[$key][2] = array_reduce( |
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array_intersect_key($originalValues, $adjacentInterval[2]), |
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$this->aggregateFunction |
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); |
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} |
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} |
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return $adjacentIntervals; |
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} |
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} |
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vctls /
php-interval-graph
