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<?php |
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namespace Pagerfanta\Adapter; |
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/** |
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* CombinedAdapter |
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* |
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* @author Mike Meier <[email protected]> |
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*/ |
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class CombinedAdapter implements AdapterInterface |
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{ |
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/** |
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* @var AdapterInterface[] |
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*/ |
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private $adapters; |
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/** |
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* @var array<string, int> |
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*/ |
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private $counts = []; |
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/** |
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* @var int |
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*/ |
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private $total = 0; |
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/** |
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* @var bool |
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*/ |
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private $init = false; |
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/** |
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* Constructor. |
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* |
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* @param AdapterInterface[] $adapters The adapters to combine. |
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*/ |
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public function __construct(array $adapters) |
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{ |
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$this->adapters = $adapters; |
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} |
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/** |
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* Returns the combined adapters. |
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* |
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* @return AdapterInterface[] The combined Adapters. |
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*/ |
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public function getAdapters(): array |
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{ |
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return $this->adapters; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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1 |
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public function getNbResults(): int |
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{ |
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$this->initCounts(); |
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return $this->total; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getSlice($offset, $length): \Traversable |
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{ |
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$this->initCounts(); |
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$currentNeeded = $length; |
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1 |
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$currentOffset = $offset; |
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foreach ($this->adapters as $adapterKey => $adapter) { |
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if ($currentNeeded <= 0) { |
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break; |
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} |
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1 |
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$adapterCount = $this->counts[spl_object_hash($adapter)]; |
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$adapterCanProvide = $adapterCount - $currentOffset; |
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if ($adapterCanProvide < 0) { |
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$currentOffset -= $adapterCount; |
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1 |
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continue; |
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} |
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$adapterLength = min($adapterCanProvide, $currentNeeded); |
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foreach ($adapter->getSlice($currentOffset, $adapterLength) as $value) { |
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yield $value; |
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} |
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1 |
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$currentNeeded -= $adapterLength; |
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1 |
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$currentOffset = 0; |
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} |
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} |
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private function initCounts() |
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{ |
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if ($this->init) { |
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return; |
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} |
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foreach ($this->adapters as $adapter) { |
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$count = $adapter->getNbResults(); |
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$this->counts[spl_object_hash($adapter)] = $count; |
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$this->total += $count; |
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} |
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$this->init = true; |
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} |
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} |
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whiteoctober /
Pagerfanta
