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<?php |
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namespace Pagerfanta\Adapter; |
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use Pagerfanta\Exception\InvalidArgumentException; |
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/** |
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* Adapter that concatenates the results of other adapters. |
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* |
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* @author Surgie Finesse <[email protected]> |
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*/ |
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class ConcatenationAdapter implements AdapterInterface |
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{ |
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/** |
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* @var AdapterInterface[] List of adapters |
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*/ |
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protected $adapters; |
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/** |
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* @var int[]|null Cache of the numbers of results of the adapters. The indexes correspond the indexes of the |
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* `adapters` property. |
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*/ |
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protected $adaptersNbResultsCache; |
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/** |
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* @param AdapterInterface[] $adapters |
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* @throws InvalidArgumentException |
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*/ |
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public function __construct(array $adapters) |
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{ |
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foreach ($adapters as $index => $adapter) { |
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if (!($adapter instanceof AdapterInterface)) { |
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throw new InvalidArgumentException(sprintf( |
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'Argument $adapters[%s] expected to be a \Pagerfanta\Adapter\AdapterInterface instance, a %s given', |
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$index, |
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is_object($adapter) ? sprintf('%s instance', get_class($adapter)) : gettype($adapter) |
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)); |
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} |
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} |
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$this->adapters = $adapters; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getNbResults() |
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{ |
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if (!isset($this->adaptersNbResultsCache)) { |
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$this->refreshAdaptersNbResults(); |
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} |
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return array_sum($this->adaptersNbResultsCache); |
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} |
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/** |
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* {@inheritdoc} |
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* @return array |
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*/ |
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public function getSlice($offset, $length) |
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{ |
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if (!isset($this->adaptersNbResultsCache)) { |
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$this->refreshAdaptersNbResults(); |
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} |
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$slice = array(); |
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$previousAdaptersNbResultsSum = 0; |
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$requestFirstIndex = $offset; |
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$requestLastIndex = $offset + $length - 1; |
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foreach ($this->adapters as $index => $adapter) { |
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$adapterNbResults = $this->adaptersNbResultsCache[$index]; |
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$adapterFirstIndex = $previousAdaptersNbResultsSum; |
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$adapterLastIndex = $adapterFirstIndex + $adapterNbResults - 1; |
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$previousAdaptersNbResultsSum += $adapterNbResults; |
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// The adapter is fully below the requested slice range — skip it |
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if ($adapterLastIndex < $requestFirstIndex) { |
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continue; |
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} |
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// The adapter is fully above the requested slice range — finish the gathering |
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if ($adapterFirstIndex > $requestLastIndex) { |
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break; |
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} |
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// Else the adapter range definitely intersects with the requested range |
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$fetchOffset = $requestFirstIndex - $adapterFirstIndex; |
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$fetchLength = $length; |
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// The requested range start is below the adapter range start |
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if ($fetchOffset < 0) { |
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$fetchLength += $fetchOffset; |
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$fetchOffset = 0; |
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} |
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// The requested range end is above the adapter range end |
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if ($fetchOffset + $fetchLength > $adapterNbResults) { |
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$fetchLength = $adapterNbResults - $fetchOffset; |
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} |
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// Getting the subslice from the adapter and adding it to the result slice |
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$fetchSlice = $adapter->getSlice($fetchOffset, $fetchLength); |
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foreach ($fetchSlice as $item) { |
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$slice[] = $item; |
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} |
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} |
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return $slice; |
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} |
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/** |
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* Refreshes the cache of the numbers of results of the adapters. |
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*/ |
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protected function refreshAdaptersNbResults() |
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{ |
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if (!isset($this->adaptersNbResultsCache)) { |
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$this->adaptersNbResultsCache = array(); |
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} |
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foreach ($this->adapters as $index => $adapter) { |
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$this->adaptersNbResultsCache[$index] = $adapter->getNbResults(); |
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} |
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} |
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} |
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whiteoctober /
Pagerfanta
