private function tryFindMatchResultFor($hash, $dataValue)
{
$descriptionFactory = $this->queryFactory->newDescriptionFactory();
$contextPage = $dataValue->getContextPage();
// Exclude the current page from the result match to check whether another
// page matches the condition and if so then the value can no longer be
// assigned and is not unique
$description = $descriptionFactory->newConjunction(array($descriptionFactory->newFromDataValue($dataValue), $descriptionFactory->newValueDescription($contextPage, null, SMW_CMP_NEQ)));
$query = $this->queryFactory->newQuery($description);
$query->setLimit(1);
$dataItems = $this->cachedPropertyValuesPrefetcher->queryPropertyValuesFor($query);
if (!is_array($dataItems) || $dataItems === array()) {
// No other assignments were found therefore it is assumed that at
// the time of the query request, the "contextPage" holds a unique
// value for the property
$page = $contextPage;
} else {
$page = end($dataItems);
}
// Create a linked list so that when the subject is altered or deleted
// the related uniqueness container can be removed as well
$blobStore = $this->cachedPropertyValuesPrefetcher->getBlobStore();
$container = $blobStore->read($this->cachedPropertyValuesPrefetcher->getRootHashFrom($page));
$container->addToLinkedList($hash);
$blobStore->save($container);
return $page;
}
/**
* @since 2.4
*
* @param DIProperty|null $property
*/
public function fetchCachedConversionData(DIProperty $property = null)
{
if ($property === null || ($propertyDiWikiPage = $property->getDiWikiPage()) === null) {
return;
}
$blobStore = $this->cachedPropertyValuesPrefetcher->getBlobStore();
// Ensure that when the property page is altered the cache gets
// evicted
$hash = $this->cachedPropertyValuesPrefetcher->getRootHashFrom($propertyDiWikiPage);
$container = $blobStore->read($hash);
$key = '--conv';
if ($container->has($key)) {
$data = $container->get($key);
$this->unitIds = $data['ids'];
$this->unitFactors = $data['factors'];
$this->mainUnit = $data['main'];
$this->prefixalUnitPreference = $data['prefix'];
return;
}
$this->fetchConversionData($property);
if ($this->errors !== array()) {
return;
}
$data = array('ids' => $this->unitIds, 'factors' => $this->unitFactors, 'main' => $this->mainUnit, 'prefix' => $this->prefixalUnitPreference);
$container->set($key, $data);
$blobStore->save($container);
}
/**
* We try to cache anything to avoid unnecessary store connections or DB
* lookups. For cases where a property was changed, the EventDipatcher will
* receive a 'property.specification.change' event (emitted as soon as the content of
* a property page was altered) with PropertySpecificationLookup::resetCacheBy
* being invoked to remove the cache entry for that specific property.
*
* @since 2.4
*
* @param DIProperty $property
* @param mixed|null $linker
* @param string $languageCode
*
* @return string
*/
public function getPropertyDescriptionBy(DIProperty $property, $linker = null, $languageCode = '')
{
// Take the linker into account (Special vs. in page rendering etc.)
$languageCode = $languageCode === '' ? $this->languageCode : $languageCode;
$key = '--pdesc:' . $languageCode . ':' . ($linker === null ? '0' : '1');
$blobStore = $this->cachedPropertyValuesPrefetcher->getBlobStore();
$container = $blobStore->read($this->cachedPropertyValuesPrefetcher->getRootHashFrom($property->getCanonicalDiWikiPage()));
if ($container->has($key)) {
return $container->get($key);
}
$localPropertyDescription = $this->tryToFindLocalPropertyDescription($property, $linker, $languageCode);
// If a local property description wasn't available for a predefined property
// the try to find a system translation
if (trim($localPropertyDescription) === '' && !$property->isUserDefined()) {
$localPropertyDescription = $this->getPredefinedPropertyDescription($property, $linker, $languageCode);
}
$container->set($key, $localPropertyDescription);
$blobStore->save($container);
return $localPropertyDescription;
}
