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<?php
namespace SMW\SQLStore;
use SMW\DIProperty;
use SMW\DIWikiPage;
use SMW\SQLStore\SQLStore;
use SMW\Store;
use SMWDataItem as DataItem;
use SMW\RequestOptions;
use SMW\IteratorFactory;
use InvalidArgumentException;
use RuntimeException;
use SMWDIContainer as DIContainer;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class EntityValueUniquenessConstraintChecker {
/**
* @var SQLStore
*/
private $store;
/**
* @var IteratorFactory
*/
private $iteratorFactory;
/**
* @since 3.0
*
* @param SQLStore $store
* @param IteratorFactory $iteratorFactory
*/
public function __construct( Store $store, IteratorFactory $iteratorFactory ) {
$this->store = $store;
$this->iteratorFactory = $iteratorFactory;
}
/**
* Find references (all or limited by RequestOptions) for the combination of
* a property and a value. This can be used to identify uniqueness violations
* amongst entities where the same value (+property) is assigned to different
* subjects or it be used to count the cardinality for a specific value
* representation.
*
* @since 3.0
*
* @param DIProperty $property
* @param DataItem $dataItem
* @param RequestOptions $requestOptions
*
* @return Iterator|[]
*/
public function checkConstraint( DIProperty $property, DataItem $dataItem, RequestOptions $requestOptions ) {
$propTableId = $this->store->getPropertyTableInfoFetcher()->findTableIdForProperty(
$property
);
$proptables = $this->store->getPropertyTables();
$propertyTable = $proptables[$propTableId];
if ( !isset( $proptables[$propTableId] ) || !$propertyTable->usesIdSubject() ) {
return [];
}
$connection = $this->store->getConnection( 'mw.db' );
$query = $connection->newQuery();
$query->index = 1;
$query->alias = 't';
$i = $query->index;
$query->table( $propertyTable->getName(), "{$query->alias}{$i}" );
// Only find entities
$query->field( "{$query->alias}{$i}.s_id" );
$this->resolve_value_condition( $propertyTable, $property, $dataItem, $query );
foreach ( $requestOptions->getExtraConditions() as $extraCondition ) {
if ( is_callable( $extraCondition ) ) {
$query->condition( $extraCondition( $this->store, $query, "{$query->alias}{$i}" ) );
} else {
throw new RuntimeException( "Expected a callable at this point!" );
}
}
$query->type( 'SELECT' );
$query->options( [ 'LIMIT' => $requestOptions->getLimit() ] );
$res = $connection->query(
$query,
__METHOD__
);
$result = $this->iteratorFactory->newMappingIterator(
$this->iteratorFactory->newResultIterator( $res ),
function( $row ) {
return $this->store->getObjectIds()->getDataItemById( $row->s_id );
}
);
return $result;
}
private function resolve_value_condition( $propertyTable, $property, $dataItem, $query ) {
// Collect conditions to appear as
// `... (t1.p_id='121913' AND t1.o_sortkey='3520062') ...`
$conditions = [];
// Keep the index in case of a recursive iteration
$i = $query->index;
if ( !$propertyTable->isFixedPropertyTable() ) {
$pid = $this->store->getObjectIds()->getSMWPropertyID(
$property
);
$conditions[] = $query->eq( "{$query->alias}{$i}.p_id", $pid );
}
$diHandler = $this->store->getDataItemHandlerForDIType(
$propertyTable->getDiType()
);
if ( !$dataItem instanceof DIContainer ) {
foreach ( $diHandler->getWhereConds( $dataItem ) as $fieldName => $value ) {
$conditions[] = $query->eq( "{$query->alias}{$i}.$fieldName", $value );
}
} else {
/**
* For a container based property/value pair we expected something similar
* to:
*
* SELECT t1.s_id FROM `smw_di_wikipage` AS t1
* INNER JOIN `smw_di_wikipage` AS t2 ON t2.s_id=t1.o_id
* INNER JOIN `smw_di_wikipage` AS t3 ON t3.s_id=t1.o_id
* INNER JOIN `smw_di_number` AS t4 ON t4.s_id=t1.o_id
* WHERE
* (t2.p_id='333615' AND t2.o_id='302096') AND
* (t3.p_id='333611' AND t3.o_id='193213') AND
* (t4.p_id='121913' AND t4.o_sortkey='3520062') AND
* (t1.p_id='310161') AND (t1.s_id!='333608')
* LIMIT 2
*/
// Handle containers recursively
$this->resolve_container_conditions( $propertyTable, $dataItem, $query );
}
$query->condition( $query->asAnd( $conditions ) );
}
private function resolve_container_conditions( $propertyTable, $dataItem, $query ) {
$proptables = $this->store->getPropertyTables();
$semanticData = $dataItem->getSemanticData();
$alias = $query->alias;
$i = $query->index;
// ought to be a type 'p' object
$keys = array_keys( $propertyTable->getFields( $this->store ) );
$joinfield = "{$alias}{$i}." . reset( $keys );
foreach ( $semanticData->getProperties() as $property ) {
$tableid = $this->store->findPropertyTableID( $property );
$subproptable = $proptables[$tableid];
foreach ( $semanticData->getPropertyValues( $property ) as $subvalue ) {
// Increase the index for each iteration to ensure that each
// condition has its own alias
$i++;
if ( $subproptable->usesIdSubject() ) {
// simply add property table to check values
$query->join(
'INNER JOIN',
[
// e.g. `... INNER JOIN `smw_di_wikipage` AS t2 ON t2.s_id=t1.o_id ...`
$subproptable->getName() => "{$alias}{$i} ON {$alias}{$i}.s_id=$joinfield"
]
);
} else {
// Rare case with a table that uses subject title+namespace
// in a container object (should never happen in SMW core!!)
$query->join(
'INNER JOIN',
[
SQLStore::ID_TABLE => "ids{$i} ON ids{$i}.smw_id=$joinfield"
]
);
$query->join(
'INNER JOIN',
[
$subproptable->getName() => "{$alias}{$i} ON {$alias}{$i}.s_title=ids{$alias}{$i}.smw_title AND {$alias}{$i}.s_namespace=ids{$alias}{$i}.smw_namespace"
]
);
}
$query->index = $i;
$this->resolve_value_condition( $subproptable, $property, $subvalue, $query );
}
}
}
}
|
