class SumAggregation

final class SumAggregation implements AggregationInterface {
    public function __construct(bool $monotonic = false) {
    }
    public function initialize() : SumSummary {
        return new SumSummary(0);
    }
    
    /**
     * @param SumSummary $summary
     */
    public function record($summary, $value, AttributesInterface $attributes, ContextInterface $context, int $timestamp) : void {
        $summary->value += $value;
    }
    
    /**
     * @param SumSummary $left
     * @param SumSummary $right
     */
    public function merge($left, $right) : SumSummary {
        $sum = $left->value + $right->value;
        return new SumSummary($sum);
    }
    
    /**
     * @param SumSummary $left
     * @param SumSummary $right
     */
    public function diff($left, $right) : SumSummary {
        $sum = -$left->value + $right->value;
        return new SumSummary($sum);
    }
    
    /**
     * @param array<SumSummary> $summaries
     */
    public function toData(array $attributes, array $summaries, array $exemplars, int $startTimestamp, int $timestamp, $temporality) : Data\Sum {
        $dataPoints = [];
        foreach ($attributes as $key => $dataPointAttributes) {
            $dataPoints[] = new Data\NumberDataPoint($summaries[$key]->value, $dataPointAttributes, $startTimestamp, $timestamp, $exemplars[$key] ?? []);
        }
        return new Data\Sum($dataPoints, $temporality, $this->monotonic);
    }

}