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<?php |
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/** |
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* @author Anton Lytkin <[email protected]> |
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*/ |
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namespace WS\Utils\Collections\Functions\Group; |
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use WS\Utils\Collections\Collection; |
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use WS\Utils\Collections\CollectionFactory; |
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use WS\Utils\Collections\Functions\ObjectFunctions; |
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class Group |
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{ |
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private $key; |
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private $aggregators; |
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public function __construct(string $key) |
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{ |
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$this->key = $key; |
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} |
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public function __invoke(Collection $collection) |
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{ |
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$groupedResult = []; |
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foreach ($collection as $element) { |
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if (!$groupKey = ObjectFunctions::getPropertyValue($element, $this->key)) { |
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continue; |
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} |
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if (!isset($groupedResult[$groupKey])) { |
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$groupedResult[$groupKey] = CollectionFactory::empty(); |
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} |
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$groupedResult[$groupKey]->add($element); |
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} |
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if (!$this->aggregators) { |
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return $groupedResult; |
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} |
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$aggregatedResult = []; |
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foreach ($groupedResult as $groupKey => $items) { |
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foreach ($this->aggregators as $item) { |
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[$destKey, $aggregator] = $item; |
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$aggregatedResult[$groupKey][$destKey] = $aggregator($items); |
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} |
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} |
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return $aggregatedResult; |
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} |
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public static function by(string $key): self |
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{ |
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return new self($key); |
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} |
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public function sum(string $sourceKey, string $destKey = null): self |
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{ |
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return $this->addAggregator($destKey ?? $sourceKey, new Aggregator\Sum($sourceKey)); |
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} |
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public function min(string $sourceKey, string $destKey = null): self |
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{ |
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return $this->addAggregator($destKey ?? $sourceKey, new Aggregator\Min($sourceKey)); |
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} |
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public function max(string $sourceKey, string $destKey = null): self |
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{ |
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return $this->addAggregator($destKey ?? $sourceKey, new Aggregator\Max($sourceKey)); |
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} |
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public function avg(string $sourceKey, string $destKey = null): self |
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{ |
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return $this->addAggregator($destKey ?? $sourceKey, new Aggregator\Avg($sourceKey)); |
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} |
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public function addToSet(string $sourceKey, string $destKey = null): self |
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{ |
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return $this->addAggregator($destKey ?? $sourceKey, new Aggregator\AddToSet($sourceKey)); |
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} |
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public function first(string $sourceKey, string $destKey = null): self |
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{ |
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return $this->addAggregator($destKey ?? $sourceKey, new Aggregator\First($sourceKey)); |
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} |
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public function last(string $sourceKey, string $destKey = null): self |
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{ |
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return $this->addAggregator($destKey ?? $sourceKey, new Aggregator\Last($sourceKey)); |
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} |
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public function count(string $destKey): self |
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{ |
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return $this->addAggregator($destKey, new Aggregator\Count()); |
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} |
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public function addAggregator(string $destKey, callable $aggregator): self |
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{ |
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$this->aggregators[] = [$destKey, $aggregator]; |
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return $this; |
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} |
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} |
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worksolutions /
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