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<?php |
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namespace Gielfeldt\Iterators; |
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/** |
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* Split an iterator into multiple iterators. |
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* |
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* Usage: |
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* foreach (new ChunkIterator($someIterator, 4) as $chunk) { |
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* foreach ($chunk as $key => $value) { |
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* ... do stuff |
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* } |
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* } |
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*/ |
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class ChunkIterator extends ValuesIterator |
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{ |
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/** |
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* Size of a chunk |
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* |
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* @var int |
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*/ |
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private $size; |
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/** |
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* The original iterator to split into chunks. |
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* |
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* @var \Iterator |
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*/ |
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private $innerIterator; |
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/** |
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* Constructor. |
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* |
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* @param \Traversable $iterator |
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* The iterator to split into chunks. |
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* @param int $size |
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* The size of each chunk. |
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*/ |
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public function __construct(\Traversable $iterator, int $size) |
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{ |
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$this->innerIterator = $iterator instanceof \Iterator ? $iterator : new \IteratorIterator($iterator); |
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$this->size = $size; |
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// The outer iterator is a finite replaceable iterator with a condition |
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// on the inner iterator not being empty. |
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parent::__construct( |
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new FiniteIterator( |
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new InfiniteIterator(new ReplaceableIterator()), |
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function ($iterator) { |
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return !$iterator->current()->valid(); |
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} |
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) |
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); |
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} |
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/** |
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* Rewind original inner iterator, and recreate inner and outer iterator. |
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* |
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* @see Iterator::rewind() |
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*/ |
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public function rewind() |
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{ |
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// Setup chunked inner iterator. |
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$this->innerIterator->rewind(); |
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$innerIterator = new \NoRewindIterator($this->innerIterator); |
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$limitedInnerIterator = new \LimitIterator($innerIterator, 0, $this->size); |
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$limitedInnerIterator->rewind(); |
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// Setup outer iterator. |
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$outerIterator = new \ArrayIterator([$limitedInnerIterator]); |
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$this->setInnerIterator($outerIterator); |
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parent::rewind(); |
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} |
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/** |
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* Make sure that the inner iterator is positioned correctly, before skipping |
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* to next chunk. |
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* |
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* @see Iterator::next() |
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*/ |
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public function next() |
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{ |
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// Finish iteration on the current chunk, if necessary, so that our |
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// inner iterator is positioned correctly. |
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while ($this->current()->valid()) { |
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$this->current()->next(); |
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} |
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// Rewind norewind iterator to repeat iterator of chunk size. |
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$this->current()->rewind(); |
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return parent::next(); |
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} |
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} |
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gielfeldt /
iterators
This check looks for calls to methods that do not seem to exist on a given type. It looks for the method on the type itself as well as in inherited classes or implemented interfaces.
This is most likely a typographical error or the method has been renamed.