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<?php |
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namespace Nayjest\Collection\Decorator; |
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use Nayjest\Collection\Collection; |
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use Nayjest\Collection\CollectionReadInterface; |
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use Nayjest\Collection\CollectionReadTrait; |
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/** |
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* Implementation of composite design pattern for collections. |
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* |
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* @package Nayjest\Collection\Decorator |
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*/ |
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class CompositeCollection implements CollectionReadInterface |
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{ |
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use CollectionReadTrait; |
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/** @var CollectionReadInterface[] */ |
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private $collections = []; |
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private $data; |
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/** |
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* @return CollectionReadInterface[] |
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*/ |
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public function getCollections() |
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{ |
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return $this->collections; |
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} |
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/** |
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* @param CollectionReadInterface[] $collections |
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* |
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* @return $this |
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*/ |
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public function setCollections(array $collections) |
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{ |
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$this->collections = $collections; |
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return $this; |
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} |
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/** |
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* Returns composed collection by index |
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* |
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* @param $index |
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* |
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* @return CollectionReadInterface |
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*/ |
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public function getCollection($index) |
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{ |
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return array_key_exists($index, $this->collections) |
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? $this->collections[$index] |
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: null; |
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} |
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protected function createCollection(array $items) |
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{ |
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$collection = new static(); |
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$collection->setCollections([new Collection($items)]); |
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return $collection; |
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} |
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/** |
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* Returns reference to array storing collection items. |
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* |
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* @return array |
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*/ |
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protected function &items() |
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{ |
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$this->updateData(); |
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return $this->data; |
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} |
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private function updateData() |
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{ |
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$this->data = (count($this->collections) !== 0) |
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? call_user_func_array( |
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'array_merge', |
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array_map('iterator_to_array', $this->collections) |
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) : []; |
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} |
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} |
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Nayjest /
Collection
