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<?php |
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namespace EngineWorks\Pivot; |
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/** |
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* Class to sort elements (ordering) of a result |
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*/ |
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class ResultOrdering |
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{ |
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/** @var array */ |
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private $orderBy; |
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/** @var bool */ |
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private $required; |
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/** |
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* ResultOrdering constructor |
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* The parameter orderBy must contain the list of aggregates and the order they must use |
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* [$aggregate1 => $order1, $aggregate2 => $order2, ... ] |
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* |
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* @param array $orderBy |
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*/ |
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public function __construct(array $orderBy) |
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{ |
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$this->orderBy = $orderBy; |
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$this->required = false; |
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foreach ($orderBy as $criteria) { |
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if ($criteria) { |
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$this->required = true; |
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break; |
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} |
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} |
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} |
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/** |
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* Method to make comparisons |
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* |
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* @param Result $a |
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* @param Result $b |
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* @return int |
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*/ |
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public function orderItems(Result $a, Result $b) |
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{ |
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// compare using every aggregator with its own order type |
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foreach ($this->orderBy as $field => $order) { |
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if ($order === Aggregate::ORDERASC) { |
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return $this->comparePivotValues($field, $a, $b); |
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} elseif ($order === Aggregate::ORDERDESC) { |
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return $this->comparePivotValues($field, $b, $a); |
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} |
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} |
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// if $a and $b are the same, order alphabetically by caption |
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return strcasecmp($a->caption, $b->caption); |
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} |
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/** |
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* Return if ordering is required based on the orderBy array |
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* |
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* @return bool |
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*/ |
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public function isRequired() |
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{ |
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return $this->required; |
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} |
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/** |
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* Internal method to check two numerical values and return 0, -1 or 1 |
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* |
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* @param string $field |
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* @param Result $a |
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* @param Result $b |
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* @return int |
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*/ |
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protected function comparePivotValues($field, Result $a, Result $b) |
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{ |
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return $a->values[$field] <=> $b->values[$field]; |
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} |
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} |
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eclipxe13 /
engineworks-pivot
