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<?php |
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/** |
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* This file is part of the Cubiche package. |
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* |
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* Copyright (c) Cubiche |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Cubiche\Core\Collections\DataSource; |
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use Cubiche\Core\Comparable\ComparatorInterface; |
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use Cubiche\Core\Specification\SpecificationInterface; |
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/** |
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* Iterator Data Source Class. |
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* |
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* @author Karel Osorio Ramírez <[email protected]> |
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*/ |
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class IteratorDataSource extends DataSource |
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{ |
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/** |
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* @var \Traversable |
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*/ |
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protected $iterator; |
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/** |
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* @var bool |
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*/ |
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private $iteratorSorted; |
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/** |
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* @param \Traversable $iterator |
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* @param SpecificationInterface $searchCriteria |
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* @param ComparatorInterface $sortCriteria |
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* @param int $offset |
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* @param int $length |
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*/ |
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public function __construct( |
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\Traversable $iterator, |
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SpecificationInterface $searchCriteria = null, |
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ComparatorInterface $sortCriteria = null, |
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$offset = null, |
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$length = null |
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) { |
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parent::__construct($searchCriteria, $sortCriteria, $offset, $length); |
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$this->iterator = $iterator; |
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$this->iteratorSorted = false; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getIterator() |
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{ |
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$this->sort(); |
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$count = 0; |
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$offset = 0; |
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foreach ($this->iterator as $item) { |
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if (!$this->checkLenght($count)) { |
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break; |
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} |
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if ($this->evaluate($item) === true) { |
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if ($this->checkOffset($offset)) { |
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++$count; |
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yield $item; |
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} else { |
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++$offset; |
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} |
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} |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function findOne() |
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{ |
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foreach ($this->getIterator() as $item) { |
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return $item; |
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} |
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return; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function filteredDataSource(SpecificationInterface $criteria) |
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{ |
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if ($this->isFiltered()) { |
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$criteria = $this->searchCriteria()->andX($criteria); |
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} |
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return new self( |
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$this->iterator, |
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$criteria, |
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$this->iteratorSorted ? null : $this->sortCriteria(), |
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$this->offset(), |
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$this->length() |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function slicedDataSource($offset, $length = null) |
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{ |
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return new self( |
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$this->iterator, |
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$this->searchCriteria(), |
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$this->iteratorSorted ? null : $this->sortCriteria(), |
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$this->actualOffset($offset), |
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$this->actualLength($offset, $length) |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function sortedDataSource(ComparatorInterface $sortCriteria) |
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{ |
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return new self( |
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$this->iterator, |
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$this->searchCriteria(), |
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$sortCriteria, |
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$this->offset(), |
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$this->length() |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function calculateCount() |
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{ |
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return \iterator_count($this->getIterator()); |
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} |
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/** |
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* @param mixed $item |
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* |
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* @return bool |
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*/ |
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protected function evaluate($item) |
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{ |
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return $this->searchCriteria() === null || $this->searchCriteria()->evaluate($item); |
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} |
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/** |
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* @param int $offset |
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* |
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* @return bool |
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*/ |
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private function checkOffset($offset) |
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{ |
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return $this->offset === null || $offset === $this->offset; |
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} |
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/** |
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* @param int $count |
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* |
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* @return bool |
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*/ |
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private function checkLenght($count) |
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{ |
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return $this->length === null || $count < $this->length; |
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} |
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private function sort() |
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{ |
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if (!$this->iteratorSorted && $this->isSorted()) { |
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if (!($this->iterator instanceof \ArrayIterator)) { |
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$this->iterator = new \ArrayIterator(iterator_to_array($this->iterator)); |
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} |
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$this->iterator->uasort(function ($a, $b) { |
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return $this->sortCriteria()->compare($a, $b); |
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}); |
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$this->iteratorSorted = true; |
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} |
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} |
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} |
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cubiche /
collections
