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<?php |
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declare(strict_types=1); |
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namespace Smoren\PartialIntersection\Util; |
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/** |
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* Based on IterTools PHP's IteratorFactory. |
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* @see https://github.com/markrogoyski/itertools-php |
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* @see https://github.com/markrogoyski/itertools-php/blob/main/src/Util/UsageMap.php |
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*/ |
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class UsageMap |
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{ |
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/** |
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* @var array<string, array<string, int>> |
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*/ |
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protected array $addedMap = []; |
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/** |
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* @var array<string, int> |
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*/ |
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protected array $deletedMap = []; |
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/** |
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* @var bool |
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*/ |
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protected bool $strict; |
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/** |
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* @param bool $strict |
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*/ |
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public function __construct(bool $strict) |
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{ |
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$this->strict = $strict; |
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} |
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/** |
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* Registers usage of the value by owner. |
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* |
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* @param mixed $value |
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* @param string $owner |
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* |
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* @return void |
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*/ |
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public function addUsage($value, string $owner): void |
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{ |
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$hash = UniqueExtractor::getString($value, $this->strict); |
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if (!isset($this->addedMap[$hash])) { |
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$this->addedMap[$hash] = []; |
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} |
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if (!isset($this->addedMap[$hash][$owner])) { |
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$this->addedMap[$hash][$owner] = 0; |
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} |
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$this->addedMap[$hash][$owner]++; |
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} |
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/** |
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* Unregister usage of the value. |
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* |
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* @param mixed $value |
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* |
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* @return void |
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*/ |
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public function deleteUsage($value): void |
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{ |
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$hash = UniqueExtractor::getString($value, $this->strict); |
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if (!isset($this->deletedMap[$hash])) { |
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$this->deletedMap[$hash] = 0; |
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} |
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$this->deletedMap[$hash]++; |
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} |
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/** |
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* Returns number of value's owners. |
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* |
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* @param mixed $value |
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* |
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* @return int |
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*/ |
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public function getOwnersCount($value): int |
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{ |
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$hash = UniqueExtractor::getString($value, $this->strict); |
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$deletesCount = $this->deletedMap[$hash] ?? 0; |
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return count(array_filter($this->addedMap[$hash] ?? [], fn ($count) => $count > $deletesCount)); |
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} |
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} |
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Smoren /
partial-intersection-php
