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<?php
namespace SMW\SQLStore;
use RuntimeException;
use SMW\DIProperty;
use SMW\DIWikiPage;
use SMW\IteratorFactory;
use SMW\Store;
/**
* Find all entities related to a change propagation (only expected
* to be used by `ChangePropagationDispatchJob`).
*
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class ChangePropagationEntityFinder {
/**
* @var Store
*/
private $store;
/**
* @var IteratorFactory
*/
private $iteratorFactory;
/**
* @var boolean
*/
private $isTypePropagation = false;
/**
* @since 3.0
*
* @param Store $store
* @param IteratorFactory $iteratorFactory
*/
public function __construct( Store $store, IteratorFactory $iteratorFactory ) {
$this->store = $store;
$this->iteratorFactory = $iteratorFactory;
}
/**
* @since 3.0
*
* @param boolean $isTypePropagation
*/
public function isTypePropagation( $isTypePropagation ) {
$this->isTypePropagation = (bool)$isTypePropagation;
}
/**
* @since 3.0
*
* @param DIProperty|DIWikiPage $entity
*
* @return Iterator
* @throws RuntimeException
*/
public function findAll( $entity ) {
if ( $entity instanceof DIProperty ) {
return $this->findByProperty( $entity );
} elseif ( $entity instanceof DIWikiPage ) {
return $this->findByCategory( $entity );
}
throw new RuntimeException( 'Cannot match the entity type.' );
}
/**
* @since 3.0
*
* @param DIProperty $property
*
* @return Iterator
*/
public function findByProperty( DIProperty $property ) {
$dataItems = [];
$appendIterator = $this->iteratorFactory->newAppendIterator();
$res = $this->store->getAllPropertySubjects(
$property
);
$appendIterator->add(
$res
);
// Select any remaining references that are hidden or have been left out
// during an update
$appendIterator->add(
$this->fetchOtherReferencesOnTypePropagation( $property )
);
$dataItems = $this->store->getPropertySubjects(
new DIProperty( DIProperty::TYPE_ERROR ),
$property->getCanonicalDiWikiPage()
);
$appendIterator->add(
$dataItems
);
return $appendIterator;
}
/**
* @since 3.0
*
* @param DIWikiPage $category
*
* @return Iterator
*/
public function findByCategory( DIWikiPage $category ) {
$appendIterator = $this->iteratorFactory->newAppendIterator();
$property = new DIProperty( '_INST' );
$appendIterator->add(
$this->store->getPropertySubjects( $property, $category )
);
// Only direct antecedents
$dataItems = $this->store->getPropertyValues(
$category,
new DIProperty( '_SUBC' )
);
foreach ( $dataItems as $dataItem ) {
$appendIterator->add(
$this->store->getPropertySubjects( $property, $dataItem )
);
}
return $appendIterator;
}
private function fetchOtherReferencesOnTypePropagation( $property ) {
// Find other references only on a type propagation (which causes a
// change of table/id assignments) for entity references
if ( $this->isTypePropagation === false ) {
return [];
}
$connection = $this->store->getConnection( 'mw.db' );
$pid = $this->store->getObjectIds()->getSMWPropertyID( $property );
$dataItemTables = $this->store->getPropertyTableInfoFetcher()->getDefaultDataItemTables();
$idList = [];
// Matches may temporary create duplicates in regrads to
// Store::getAllPropertySubjects but it will be dealt with by the
// deduplication in the ChangePropagationUpdateJob
foreach ( $dataItemTables as $tableName ) {
// Select any references that are hidden or remained active
$rows = $connection->select(
$connection->tableName( $tableName ),
[
's_id'
],
[
'p_id' => $pid
],
__METHOD__
);
foreach ( $rows as $row ) {
$idList[] = $row->s_id;
}
}
if ( $idList === [] ) {
return $idList;
}
return $this->store->getObjectIds()->getDataItemPoolHashListFor( $idList );
}
}
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