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<?php |
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declare(strict_types=1); |
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/** |
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* Infrastructure Related Agent |
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* @author Max Demian <[email protected]> |
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*/ |
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namespace Ticaje\FileManager\Infrastructure\Driver\Iterator; |
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use Iterator as SuperIterator; |
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use Ticaje\FileManager\Infrastructure\Driver\Reader\Interfaces\FileInterface as FileManagerAgency; |
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use Ticaje\FileManager\Infrastructure\Driver\Reader\Interfaces\Gateway\FileGatewayInterface; |
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use ArrayIterator; |
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/** |
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* Class SimpleIterator |
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* @package Ticaje\FileManager\Infrastructure\Driver\Iterator |
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* This is an API to provide high level interaction with iterators. It offers composition over inheritance approach, so |
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* the iterator is being injected through constructor and the class offers the possibility of accessing useful features |
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* to files especially on big ones |
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*/ |
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class SimpleIterator implements SimpleIteratorInterface |
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{ |
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/** @var ArrayIterator $content */ |
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private $content; |
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/** @var array $cachedRows */ |
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private $cachedRows = []; |
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/** @var FileGatewayInterface $implementor */ |
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private $implementor; |
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/** |
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* SimpleIterator constructor. |
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* |
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* @param FileManagerAgency $fileManagerAgency |
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*/ |
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public function __construct( |
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FileManagerAgency $fileManagerAgency |
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) { |
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$this->implementor = $fileManagerAgency->getImplementor(); |
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$this->content = $fileManagerAgency->getContentCopy(); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function findCell(int $rowIndex, int $columnIndex) |
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{ |
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$row = $this->findRow($rowIndex); |
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return $row ? $row[$columnIndex] : null; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function findRow(int $number): ?array |
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{ |
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return $this->getChunk($number, $number); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getChunk(int $begin, int $end): ?array |
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{ |
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$end ++; |
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$result = []; |
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// Returns none if no range at all |
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if ($begin >= $end || $begin < 0) { |
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return $result; |
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} |
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// Pick data from cache first of none |
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if ($begin < $this->content->key()) { |
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// Last row not inclusive |
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$range = range($begin, $end - 1); |
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array_walk($range, function ($i) use (&$result) { |
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if (isset($this->cachedRows[$i])) { |
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$result[$i] = $this->cachedRows[$i]; |
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} |
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}); |
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} |
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// Go for the left un-cached data |
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// Csv file with no data and just the header, key is null |
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while (!is_null($this->content->key()) && ($this->content->key() < $end)) { |
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$key = $this->content->key(); |
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// This almost unlikely |
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if (isset($this->cachedRows[$key])) { |
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$result[$key] = $this->cachedRows[$key]; |
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$this->content->next(); |
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continue; |
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} |
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$row = $this->content->current(); |
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if ($key >= $begin) { |
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$result[$key] = $this->implementor->asArray($row); |
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} |
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// Always cache row |
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$this->cachedRows[$key] = $this->implementor->asArray($row); |
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$this->content->next(); |
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} |
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return $result; |
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} |
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} |
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ticaje /
fileManager
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