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<?php |
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declare(strict_types=1); |
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namespace Sirius\Filtration; |
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use Sirius\Filtration\Filter\AbstractFilter as AbstractFilterAlias; |
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class FilterSet extends \SplPriorityQueue |
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{ |
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/** |
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* Cache of priorities that were already taken |
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* |
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* @var array |
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*/ |
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protected $allocatedPriorities = []; |
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public function __construct() |
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{ |
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$this->setExtractFlags(static::EXTR_BOTH); |
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} |
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public function compare($priority1, $priority2) |
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{ |
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if ($priority1 === $priority2) { |
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return 0; |
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} |
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return $priority1 < $priority2 ? 1 : -1; |
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} |
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public function insert($filter, $priority) |
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{ |
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if (!$filter instanceof Filter\AbstractFilter) { |
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throw new \InvalidArgumentException('Only filter instances can be added to the filter set'); |
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} |
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$this->allocatedPriorities[] = $this->getValidPriority($priority); |
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return parent::insert($filter, $priority); |
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} |
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public function remove($filter) |
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{ |
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/* @var $filter AbstractFilterAlias */ |
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if (!$filter instanceof Filter\AbstractFilter) { |
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throw new \InvalidArgumentException('Only filter instances can be removed from the filter set'); |
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} |
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$filters = []; |
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$this->top(); |
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while ($this->valid()) { |
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$item = $this->current(); |
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/* @var $itemFilter AbstractFilterAlias */ |
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$itemFilter = $item['data']; |
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if ($itemFilter->getUniqueId() !== $filter->getUniqueId()) { |
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$filters[$item['priority']] = $item['data']; |
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} |
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$this->next(); |
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} |
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foreach ($filters as $priority => $filter) { |
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$this->insert($filter, $priority); |
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} |
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return $this; |
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} |
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/** |
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* Get a valid priority number to attach to a filter |
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* |
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* @param int $desiredPriority |
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* @return number |
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*/ |
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protected function getValidPriority($desiredPriority) |
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{ |
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// make sure the priority is an integer so we don't screw up the math |
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// also multiply everything by 10000 because the priority must be an integer |
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// as it will be used as the $filters[$selector] array key |
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$desiredPriority = (int) $desiredPriority * 10000; |
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if (! in_array($desiredPriority, $this->allocatedPriorities)) { |
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return $desiredPriority; |
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} |
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// the increment will be used to determine when we find an available spot |
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// obviously if you have 10000 filters with priority 0, |
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// the 10000th will get to priority one but that's a chance we are willing to take |
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$increment = 1; |
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while (in_array($desiredPriority, $this->allocatedPriorities)) { |
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$desiredPriority += $increment; |
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} |
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return $desiredPriority; |
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} |
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public function applyFilters($value, $valueIdentifier = null, $context = null) |
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{ |
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foreach (clone $this as $filter) { |
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if (is_array($filter)) { |
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$filter = $filter['data']; |
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} |
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/* @var $filter AbstractFilterAlias */ |
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$filter->setContext($context); |
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$value = $filter->filter($value, (string) $valueIdentifier); |
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} |
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return $value; |
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} |
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} |
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siriusphp /
filtration
