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<?php |
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/* |
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* This file is part of the ONGR package. |
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* |
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* (c) NFQ Technologies UAB <[email protected]> |
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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 ONGR\FilterManagerBundle\Pager; |
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use Symfony\Component\OptionsResolver\OptionsResolver; |
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/** |
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* Returns all the required data to paginate. |
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*/ |
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class PagerService |
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{ |
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/** |
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* @var int Current page. |
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*/ |
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private $page; |
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/** |
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* @var int Number of items per page. |
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*/ |
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private $limit; |
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/** |
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* @var int Maximum number of pages. |
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*/ |
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private $maxPages; |
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/** |
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* Constructor. |
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* |
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* @param PagerAdapterInterface $adapter The pager adapter. |
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* @param array $options Additional options. |
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*/ |
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public function __construct(PagerAdapterInterface $adapter, array $options = []) |
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{ |
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$this->adapter = $adapter; |
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$resolver = new OptionsResolver(); |
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$this->setRequiredOptions($resolver); |
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$options = $resolver->resolve($options); |
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$this->setLimit($options['limit']); |
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$this->setPage($options['page']); |
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$this->setMaxPages($options['max_pages']); |
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} |
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/** |
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* Sets the required options. |
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* |
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* @param OptionsResolver $resolver |
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*/ |
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private function setRequiredOptions(OptionsResolver $resolver) |
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{ |
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$resolver |
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->setRequired(['limit', 'page', 'max_pages']) |
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->setDefaults(['max_pages' => 8, 'limit' => 10, 'page' => 1]); |
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} |
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/** |
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* Sets the current page number. |
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* |
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* @param int $page The current page number. |
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*/ |
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public function setPage($page) |
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{ |
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$this->page = min($page > 0 ? $page : $this->getFirstPage(), $this->getLastPage()); |
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} |
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/** |
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* Returns the current page number. |
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* |
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* @return int |
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*/ |
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public function getPage() |
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{ |
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return $this->page; |
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} |
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/** |
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* Sets the results limit for one page. |
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* |
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* @param int $limit |
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*/ |
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public function setLimit($limit) |
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{ |
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$this->limit = $limit > 0 ? $limit : 1; |
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$this->setPage($this->page); |
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} |
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/** |
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* Returns the current results limit for one page. |
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* |
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* @return int |
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*/ |
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public function getLimit() |
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{ |
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return $this->limit; |
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} |
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/** |
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* Sets the number of pages shown. |
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* |
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* @param int $maxPages |
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*/ |
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public function setMaxPages($maxPages) |
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{ |
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$this->maxPages = $maxPages; |
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} |
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/** |
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* Returns the number of pages shown. |
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* |
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* @return int |
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*/ |
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public function getMaxPages() |
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{ |
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return $this->maxPages; |
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} |
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/** |
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* Returns the next page number. |
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* |
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* @return int |
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*/ |
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public function getNextPage() |
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{ |
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$lastPage = $this->getLastPage(); |
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return $this->page < $lastPage ? $this->page + 1 : $lastPage; |
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} |
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/** |
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* Returns the previous page number. |
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* |
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* @return int |
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*/ |
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public function getPreviousPage() |
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{ |
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return $this->page > $this->getFirstPage() ? $this->page - 1 : $this->getFirstPage(); |
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} |
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/** |
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* Returns true if the current page is first. |
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* |
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* @return bool |
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*/ |
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public function isFirstPage() |
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{ |
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return $this->page == 1; |
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} |
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/** |
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* Returns the first page number. |
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* |
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* @return int |
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*/ |
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public function getFirstPage() |
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{ |
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return 1; |
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} |
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/** |
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* Returns true if the current page is last. |
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* |
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* @return bool |
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*/ |
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public function isLastPage() |
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{ |
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return $this->page == $this->getLastPage(); |
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} |
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/** |
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* Returns the last page number. |
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* |
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* @return int |
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*/ |
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public function getLastPage() |
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{ |
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return $this->hasResults() ? ceil($this->adapter->getTotalResults() / $this->limit) : $this->getFirstPage(); |
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} |
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/** |
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* Returns true if the current result set requires pagination. |
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* |
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* @return bool |
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*/ |
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public function isPaginable() |
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{ |
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return $this->adapter->getTotalResults() > $this->limit; |
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} |
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/** |
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* Generates a page list. |
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* |
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* @return array The page list. |
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*/ |
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public function getPages() |
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{ |
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$pages = $this->getMaxPages(); |
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$tmpBegin = $this->page - floor($pages / 2); |
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$tmpEnd = $tmpBegin + $pages - 1; |
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if ($tmpBegin < $this->getFirstPage()) { |
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$tmpEnd += $this->getFirstPage() - $tmpBegin; |
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$tmpBegin = $this->getFirstPage(); |
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} |
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if ($tmpEnd > $this->getLastPage()) { |
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$tmpBegin -= $tmpEnd - $this->getLastPage(); |
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$tmpEnd = $this->getLastPage(); |
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} |
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$begin = max($tmpBegin, $this->getFirstPage()); |
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$end = $tmpEnd; |
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return range($begin, $end, 1); |
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} |
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/** |
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* Returns true if the current result set is not empty. |
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* |
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* @return bool |
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*/ |
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public function hasResults() |
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{ |
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return $this->adapter->getTotalResults() > 0; |
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} |
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/** |
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* Returns results list for the current page and limit. |
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* |
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* @return array |
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*/ |
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public function getResults() |
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{ |
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return $this->hasResults() ? $this->adapter->getResults($this->getOffset(), $this->limit) : []; |
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} |
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/** |
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* Returns offset. |
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* |
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* @return int |
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*/ |
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public function getOffset() |
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{ |
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return ($this->page - 1) * $this->limit; |
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} |
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/** |
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* Returns the current adapter instance. |
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* |
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* @return PagerAdapterInterface |
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*/ |
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public function getAdapter() |
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{ |
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return $this->adapter; |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: