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<?php |
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namespace Sylius\Api; |
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class Paginator implements PaginatorInterface |
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{ |
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/** |
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* @var AdapterInterface $adapter |
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*/ |
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private $adapter; |
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/** |
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* @var int |
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*/ |
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private $currentPage = 1; |
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/** |
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* @var int |
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*/ |
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private $lastPage; |
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/** |
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* @var array |
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*/ |
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private $currentResults; |
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/** |
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* @var int |
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*/ |
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private $numberOfResults = -1; |
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/** |
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* @var array $queryParameters |
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*/ |
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private $queryParameters; |
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/** |
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* @var array $uriParameters |
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*/ |
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private $uriParameters; |
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/** |
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* @param AdapterInterface $adapter |
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* @param array $queryParameters |
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* @param array $uriParameters |
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*/ |
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public function __construct(AdapterInterface $adapter, array $queryParameters = [], array $uriParameters = []) |
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{ |
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$queryParameters['limit'] = isset($queryParameters['limit']) ? $queryParameters['limit'] : 10; |
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if (!is_int($queryParameters['limit'])) { |
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throw new \InvalidArgumentException('Page limit must an integer!'); |
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} |
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$this->adapter = $adapter; |
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$this->queryParameters = $queryParameters; |
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$this->queryParameters['page'] = $this->currentPage; |
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$this->uriParameters = $uriParameters; |
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$this->lastPage = (int) ceil($this->getNumberOfResults() / $queryParameters['limit']); |
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} |
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public function getCurrentPageResults() |
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{ |
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if (!$this->isResultCached()) { |
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$this->queryParameters['page'] = $this->currentPage; |
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$this->currentResults = $this->adapter->getResults($this->queryParameters, $this->uriParameters); |
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} |
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return $this->currentResults; |
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} |
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private function isResultCached() |
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{ |
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return (null !== $this->currentResults); |
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} |
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public function previousPage() |
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{ |
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if (!$this->hasPreviousPage()) { |
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throw new \LogicException('There is no previous page.'); |
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} |
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$this->currentPage--; |
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$this->currentResults = null; |
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} |
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public function nextPage() |
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{ |
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if (!$this->hasNextPage()) { |
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throw new \LogicException('There is no next page.'); |
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} |
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$this->currentPage++; |
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$this->currentResults = null; |
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} |
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public function hasPreviousPage() |
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{ |
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return (1 < $this->currentPage); |
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} |
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public function hasNextPage() |
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{ |
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return ($this->currentPage < $this->lastPage); |
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} |
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public function getNumberOfResults() |
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{ |
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if (-1 === $this->numberOfResults) { |
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$this->numberOfResults = $this->adapter->getNumberOfResults($this->queryParameters, $this->uriParameters); |
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} |
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return $this->numberOfResults; |
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} |
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/** |
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* @return int |
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*/ |
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public function getCurrentPage() |
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{ |
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return $this->currentPage; |
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} |
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} |
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