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<?php |
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declare(strict_types=1); |
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namespace Stratadox\Sorting; |
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use Closure; |
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/** |
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* Sorter logic for comparing multiple values according to the sort definition. |
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* |
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* Leaves retrieving the values to the concrete implementations. |
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* |
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* @author Stratadox |
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* @package Stratadox\Sorting |
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*/ |
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abstract class Sorter implements SortsTheElements |
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{ |
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public function sortThe($elements, DefinesHowToSort $sorting) : array |
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{ |
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usort($elements, $this->function($sorting)); |
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return $elements; |
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} |
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private function function(DefinesHowToSort $sorting) : Closure |
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{ |
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return function($element1, $element2) use ($sorting) { |
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return $this->doTheSorting($element1, $element2, $sorting); |
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}; |
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} |
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private function doTheSorting( |
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$element1, |
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$element2, |
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DefinesHowToSort $sorting |
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) : int |
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{ |
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$comparison = 0; |
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while ($sorting->isRequired()) { |
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$comparison = $this->compareElements($element1, $element2, $sorting); |
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if ($comparison !== 0) { |
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break; |
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} |
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$sorting = $sorting->next(); |
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} |
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return $comparison; |
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} |
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private function compareElements( |
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$element1, |
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$element2, |
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DefinesHowToSort $sorting |
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) : int |
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{ |
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if ($sorting->ascends()) { |
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return $this->compareValues( |
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$this->valueFor($element1, $sorting->field()), |
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$this->valueFor($element2, $sorting->field()) |
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); |
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} |
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return $this->compareValues( |
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$this->valueFor($element2, $sorting->field()), |
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$this->valueFor($element1, $sorting->field()) |
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); |
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} |
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private function compareValues($value1, $value2) : int |
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{ |
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return $value1 <=> $value2; |
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} |
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abstract protected function valueFor($element, string $field); |
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} |
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Stratadox /
Sorting
