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<?php |
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/** |
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* This file is part of the PHPMongo package. |
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* |
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* (c) Dmytro Sokil <[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 Sokil\Mongo; |
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class Paginator implements \Iterator |
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{ |
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private $currentPage = 1; |
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private $itemsOnPage = 30; |
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private $totalRowsCount; |
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/** |
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* |
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* @var \Sokil\Mongo\Cursor |
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*/ |
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private $cursor; |
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public function __construct(Cursor $cursor = null) |
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{ |
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if ($cursor !== null) { |
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$this->setCursor($cursor); |
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} |
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} |
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public function __destruct() |
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{ |
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$this->cursor = null; |
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} |
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/** |
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* |
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* @param int $itemsOnPage |
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* @return Paginator |
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*/ |
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public function setItemsOnPage($itemsOnPage) |
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{ |
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$this->itemsOnPage = (int) $itemsOnPage; |
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// define offset |
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$this->applyLimits(); |
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return $this; |
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} |
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/** |
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* |
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* @param int $currentPage |
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* @return \Sokil\Mongo\Paginator |
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*/ |
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public function setCurrentPage($currentPage) |
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{ |
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$this->currentPage = (int) $currentPage; |
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// define offset |
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$this->applyLimits(); |
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return $this; |
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} |
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public function getCurrentPage() |
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{ |
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// check if current page number greater than max allowed |
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$totalPageCount = $this->getTotalPagesCount(); |
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// no document found - page is 1 |
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if (0 === $totalPageCount) { |
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return 1; |
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} |
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if ($this->currentPage <= $totalPageCount) { |
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$currentPage = $this->currentPage; |
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} else { |
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$currentPage = $totalPageCount; |
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} |
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return $currentPage; |
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} |
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/** |
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* Define cursor for paginator |
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* |
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* @param \Sokil\Mongo\Cursor $cursor |
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* @return \Sokil\Mongo\Paginator |
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*/ |
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public function setCursor(Cursor $cursor) |
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{ |
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$this->cursor = clone $cursor; |
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$this->applyLimits(); |
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return $this; |
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} |
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public function getTotalRowsCount() |
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{ |
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if (null !== $this->totalRowsCount) { |
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return $this->totalRowsCount; |
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} |
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$this->totalRowsCount = $this->cursor->count(); |
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return $this->totalRowsCount; |
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} |
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/** |
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* @return int |
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*/ |
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public function getTotalPagesCount() |
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{ |
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return (int) ceil($this->getTotalRowsCount() / $this->itemsOnPage); |
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} |
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private function applyLimits() |
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{ |
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if (!$this->cursor) { |
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return; |
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} |
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$currentPage = $this->getCurrentPage(); |
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// get page of rows |
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$this->cursor |
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->limit($this->itemsOnPage) |
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->skip(($currentPage - 1) * $this->itemsOnPage); |
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} |
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/** |
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* @return void |
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*/ |
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public function rewind() |
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{ |
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$this->cursor->rewind(); |
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} |
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/** |
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* @return bool |
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*/ |
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public function valid() |
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{ |
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return $this->cursor->valid(); |
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} |
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/** |
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* @return Document |
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*/ |
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public function current() |
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{ |
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return $this->cursor->current(); |
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} |
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/** |
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* @return string |
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*/ |
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public function key() |
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{ |
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return $this->cursor->key(); |
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} |
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/** |
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* @return void |
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*/ |
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public function next() |
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{ |
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$this->cursor->next(); |
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} |
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} |
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