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<?php |
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namespace Del\Filter\Filter; |
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use ArrayIterator; |
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use LogicException; |
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class PaginationFilter implements FilterInterface |
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{ |
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/** @var int $page */ |
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private $page; |
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/** @var int $numPerPage */ |
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private $numPerPage; |
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/** @var int $totalRecords */ |
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private $totalRecords; |
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/** @var ArrayIterator $collection */ |
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private $collection; |
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/** @var int $resultsOffset */ |
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private $resultsOffset; |
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private $resultsEndOffset; |
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/** |
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* @param ArrayIterator $collection |
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* @return ArrayIterator |
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*/ |
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public function filter(ArrayIterator $collection): ArrayIterator |
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{ |
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// If pagination wasnt set, dont use it! |
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if (!$this->page || !$this->numPerPage) { |
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return $collection; |
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} |
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$this->collection = $collection; |
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$this->totalRecords = $collection->count(); |
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$this->resultsOffset = ($this->page * $this->numPerPage) - $this->numPerPage; |
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$this->resultsEndOffset = $this->resultsOffset + $this->numPerPage; |
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if ($this->resultsOffset > $this->totalRecords) { |
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throw new LogicException('There aren\'t that many pages for this result set.'); |
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} |
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$results = $this->getResults(); |
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return $results; |
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} |
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private function getResults() |
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{ |
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$results = new ArrayIterator(); |
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$this->collection->rewind(); |
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for ($x = 0; $x < $this->totalRecords; $x ++) { |
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$this->handleRow($x, $results); |
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} |
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return $results; |
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} |
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private function handleRow(int $x, ArrayIterator $results) |
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{ |
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if ($this->collection->valid()) { |
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$row = $this->collection->current(); |
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if ($x >= $this->resultsOffset && $x < $this->resultsEndOffset) { |
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$results->append($row); |
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} |
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$this->collection->next(); |
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} |
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} |
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/** |
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* @return int |
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*/ |
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public function getPage(): int |
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{ |
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return $this->page; |
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} |
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/** |
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* @param int $page |
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* @return PaginationFilter |
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*/ |
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public function setPage(int $page): PaginationFilter |
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{ |
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$this->page = $page; |
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return $this; |
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} |
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/** |
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* @return int |
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*/ |
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public function getNumPerPage(): int |
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{ |
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return $this->numPerPage; |
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} |
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/** |
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* @param int $numPerPage |
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* @return PaginationFilter |
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*/ |
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public function setNumPerPage(int $numPerPage): PaginationFilter |
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{ |
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$this->numPerPage = $numPerPage; |
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return $this; |
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} |
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/** |
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* @return int |
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*/ |
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public function getTotalPages() : int |
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{ |
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if (!$this->collection instanceof ArrayIterator) { |
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throw new LogicException('You must first pass your collection in to filter'); |
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} |
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return ceil(($this->totalRecords / $this->numPerPage)); |
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} |
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} |
delboy1978uk /
collection-filter
