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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 $collection): array |
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{ |
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$groupedResult = $this->group($collection); |
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if (!$this->aggregators) { |
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return $groupedResult; |
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} |
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return $this->applyAggregators($groupedResult); |
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} |
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private function group(Collection $collection): array |
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{ |
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$result = []; |
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foreach ($collection as $element) { |
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if (!$groupKey = ObjectFunctions::getPropertyValue($element, $this->key)) { |
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continue; |
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} |
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if (!isset($result[$groupKey])) { |
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$result[$groupKey] = CollectionFactory::empty(); |
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} |
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$result[$groupKey]->add($element); |
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} |
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return $result; |
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} |
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private function applyAggregators(array $groupedResult): array |
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{ |
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$result = []; |
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foreach ($groupedResult as $groupKey => $items) { |
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foreach ($this->aggregators as $item) { |
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[$destKey, $aggregator] = $item; |
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$result[$groupKey][$destKey] = $aggregator($items); |
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} |
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} |
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return $result; |
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} |
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/** |
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* Create new instance of Group and use $key as group key |
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* @param string $key |
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* @return static |
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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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/** |
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* Will calculate sum of items based on $sourceKey and put it to $destKey |
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* @param string $sourceKey |
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* @param string|null $destKey |
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* @return $this |
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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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/** |
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* Will calculate minimum value of items based on $sourceKey and put it to $destKey |
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* @param string $sourceKey |
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* @param string|null $destKey |
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* @return $this |
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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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/** |
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* Will calculate maximum value of items based on $sourceKey and put it to $destKey |
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* @param string $sourceKey |
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* @param string|null $destKey |
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* @return $this |
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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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/** |
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* Will calculate average value of items based on $sourceKey and put it to $destKey |
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* @param string $sourceKey |
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* @param string|null $destKey |
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* @return $this |
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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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/** |
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* Will find unique values of items based on $sourceKey and put it to $destKey |
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* @param string $sourceKey |
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* @param string|null $destKey |
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* @return $this |
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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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/** |
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* Will return first value of items based on $sourceKey and put it to $destKey |
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* @param string $sourceKey |
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* @param string|null $destKey |
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* @return $this |
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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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/** |
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* Will return last value of items based on $sourceKey and put it to $destKey |
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* @param string $sourceKey |
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* @param string|null $destKey |
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* @return $this |
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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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/** |
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* Will calculate count of items in group and put it to $destKey |
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* @param string $destKey |
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* @return $this |
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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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/** |
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* Add custom $aggregator with interface Aggregator\Aggregator|<Fn($c: Collection)> |
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* @param string $destKey |
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* @param callable $aggregator |
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* @return $this |
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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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168
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} |
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