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<?php |
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namespace Box\Spout\Reader\XLSX\Manager\SharedStringsCaching; |
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use Box\Spout\Reader\Exception\SharedStringNotFoundException; |
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/** |
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* Class InMemoryStrategy |
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* |
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* This class implements the in-memory caching strategy for shared strings. |
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* This strategy is used when the number of unique strings is low, compared to the memory available. |
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*/ |
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class InMemoryStrategy implements CachingStrategyInterface |
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{ |
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/** @var \SplFixedArray Array used to cache the shared strings */ |
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protected $inMemoryCache; |
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/** @var bool Whether the cache has been closed */ |
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protected $isCacheClosed; |
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/** |
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* @param int $sharedStringsUniqueCount Number of unique shared strings |
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*/ |
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public function __construct($sharedStringsUniqueCount) |
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{ |
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$this->inMemoryCache = new \SplFixedArray($sharedStringsUniqueCount); |
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$this->isCacheClosed = false; |
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} |
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/** |
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* Adds the given string to the cache. |
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* |
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* @param string $sharedString The string to be added to the cache |
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* @param int $sharedStringIndex Index of the shared string in the sharedStrings.xml file |
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* @return void |
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*/ |
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public function addStringForIndex($sharedString, $sharedStringIndex) |
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{ |
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if (!$this->isCacheClosed) { |
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$this->inMemoryCache->offsetSet($sharedStringIndex, $sharedString); |
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} |
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} |
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/** |
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* Closes the cache after the last shared string was added. |
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* This prevents any additional string from being added to the cache. |
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* |
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* @return void |
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*/ |
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public function closeCache() |
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{ |
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$this->isCacheClosed = true; |
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} |
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/** |
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* Returns the string located at the given index from the cache. |
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* |
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* @param int $sharedStringIndex Index of the shared string in the sharedStrings.xml file |
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* @throws \Box\Spout\Reader\Exception\SharedStringNotFoundException If no shared string found for the given index |
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* @return string The shared string at the given index |
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*/ |
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public function getStringAtIndex($sharedStringIndex) |
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{ |
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try { |
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return $this->inMemoryCache->offsetGet($sharedStringIndex); |
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} catch (\RuntimeException $e) { |
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throw new SharedStringNotFoundException("Shared string not found for index: $sharedStringIndex"); |
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} |
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} |
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/** |
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* Destroys the cache, freeing memory and removing any created artifacts |
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* |
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* @return void |
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*/ |
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public function clearCache() |
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{ |
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unset($this->inMemoryCache); |
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$this->isCacheClosed = false; |
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} |
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} |
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box /
spout
