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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Data\Paginator; |
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use Yiisoft\Data\Reader\Filter\GreaterThan; |
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use Yiisoft\Data\Reader\Filter\LessThan; |
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use Yiisoft\Data\Reader\DataReaderInterface; |
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use Yiisoft\Data\Reader\FilterableDataInterface; |
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use Yiisoft\Data\Reader\SortableDataInterface; |
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/** |
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* Keyset paginator |
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* |
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* - Equally fast for 1st and 1000nd page |
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* - Total number of pages is not available |
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* - Cannot get to specific page, only "next" and "previous" |
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* |
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* @link https://use-the-index-luke.com/no-offset |
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*/ |
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class KeysetPaginator |
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{ |
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/** |
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* @var FilterableDataInterface|DataReaderInterface|SortableDataInterface |
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*/ |
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private $dataReader; |
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private $pageSize; |
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private $firstValue; |
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private $lastValue; |
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private $currentFirstValue; |
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private $currentLastValue; |
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public function __construct(DataReaderInterface $dataReader) |
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{ |
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if (!$dataReader instanceof FilterableDataInterface) { |
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throw new \InvalidArgumentException('Data reader should implement FilterableDataInterface in order to be used with keyset paginator'); |
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} |
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if (!$dataReader instanceof SortableDataInterface) { |
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throw new \InvalidArgumentException('Data reader should implement SortableDataInterface in order to be used with keyset paginator'); |
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} |
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if ($dataReader->getSort() === null) { |
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throw new \RuntimeException('Data sorting should be configured in order to work with keyset pagination'); |
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} |
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$this->dataReader = $dataReader; |
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} |
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public function read(): iterable |
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{ |
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$this->currentLastValue = null; |
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$this->currentFirstValue = null; |
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$dataReader = $this->dataReader->withLimit($this->pageSize); |
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$sort = $this->dataReader->getSort(); |
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$order = $sort->getOrder(); |
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if ($order === []) { |
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throw new \RuntimeException('Data should be always sorted in order to work with keyset pagination'); |
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} |
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$goingToPreviousPage = $this->firstValue !== null && $this->lastValue === null; |
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$goingToNextPage = $this->firstValue === null && $this->lastValue !== null; |
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if ($goingToPreviousPage) { |
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// reverse sorting |
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2 |
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foreach ($order as &$sorting) { |
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2 |
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$sorting = $sorting === 'asc' ? 'desc' : 'asc'; |
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} |
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2 |
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unset($sorting); |
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2 |
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$dataReader = $dataReader->withSort($sort->withOrder($order)); |
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} |
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// first order field is the field we are paging by |
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$field = null; |
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$sorting = null; |
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foreach ($order as $field => $sorting) { |
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break; |
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} |
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if ($goingToPreviousPage || $goingToNextPage) { |
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$value = $goingToPreviousPage ? $this->firstValue : $this->lastValue; |
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$filter = null; |
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if ($sorting === 'asc') { |
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$filter = new GreaterThan($field, $value); |
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} elseif ($sorting === 'desc') { |
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$filter = new LessThan($field, $value); |
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} |
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$dataReader = $dataReader->withFilter($filter); |
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} |
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$data = []; |
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foreach ($dataReader->read() as $item) { |
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$this->currentLastValue = $item[$field]; |
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if ($this->currentFirstValue === null) { |
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$this->currentFirstValue = $item[$field]; |
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} |
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$data[] = $item; |
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} |
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5 |
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if ($goingToPreviousPage) { |
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[$this->currentFirstValue, $this->currentLastValue] = [$this->currentLastValue, $this->currentFirstValue]; |
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return array_reverse($data); |
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} |
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return $data; |
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} |
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2 |
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public function withFirst($value): self |
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{ |
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2 |
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$new = clone $this; |
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$new->firstValue = $value; |
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return $new; |
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} |
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public function withLast($value): self |
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{ |
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$new = clone $this; |
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$new->lastValue = $value; |
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return $new; |
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} |
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2 |
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public function getFirst() { |
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return $this->currentFirstValue; |
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} |
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public function getLast() { |
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return $this->currentLastValue; |
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} |
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7 |
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public function withPageSize(int $pageSize): self |
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{ |
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7 |
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if ($pageSize < 1) { |
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1 |
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throw new \InvalidArgumentException('Page size should be at least 1'); |
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} |
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6 |
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$new = clone $this; |
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6 |
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$new->pageSize = $pageSize; |
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return $new; |
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} |
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} |
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yiisoft /
data
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