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<?php
namespace SMW\SQLStore\QueryEngine\DescriptionInterpreters;
use SMW\DIWikiPage;
use SMW\Query\Language\Description;
use SMW\Query\Language\ValueDescription;
use SMW\SQLStore\QueryEngine\DescriptionInterpreter;
use SMW\SQLStore\QueryEngine\FulltextSearchTableFactory;
use SMW\SQLStore\QueryEngine\QuerySegment;
use SMW\SQLStore\QueryEngine\QuerySegmentListBuilder;
use SMWDIBlob as DIBlob;
use SMWSql3SmwIds;
/**
* @license GNU GPL v2+
* @since 2.2
*
* @author Markus Krötzsch
* @author Jeroen De Dauw
* @author mwjames
*/
class ValueDescriptionInterpreter implements DescriptionInterpreter {
/**
* @var QuerySegmentListBuilder
*/
private $querySegmentListBuilder;
/**
* @var ComparatorMapper
*/
private $comparatorMapper;
/**
* @var FulltextSearchTableFactory
*/
private $fulltextSearchTableFactory;
/**
* @since 2.2
*
* @param QuerySegmentListBuilder $querySegmentListBuilder
*/
public function __construct( QuerySegmentListBuilder $querySegmentListBuilder ) {
$this->querySegmentListBuilder = $querySegmentListBuilder;
$this->comparatorMapper = new ComparatorMapper();
$this->fulltextSearchTableFactory = new FulltextSearchTableFactory();
}
/**
* @since 2.2
*
* @return boolean
*/
public function canInterpretDescription( Description $description ) {
return $description instanceof ValueDescription;
}
/**
* Only type '_wpg' objects can appear on query level (essentially as nominal classes)
*
* @since 2.2
*
* @param Description $description
*
* @return QuerySegment
*/
public function interpretDescription( Description $description ) {
$query = new QuerySegment();
if ( !$description->getDataItem() instanceof DIWikiPage ) {
return $query;
}
$comparator = $description->getComparator();
$property = $description->getProperty();
$value = $description->getDataItem()->getSortKey();
// A simple value match using the `~~Foo` will initiate a fulltext
// search without being bound to a property allowing a broad match
// search
if ( ( $comparator === SMW_CMP_LIKE || $comparator === SMW_CMP_NLKE ) ) {
$fulltextSearchSupport = $this->addFulltextSearchCondition(
$description,
$query,
$comparator,
$value
);
if ( $fulltextSearchSupport ) {
return $query;
}
}
if ( $comparator === SMW_CMP_EQ ) {
$query->type = QuerySegment::Q_VALUE;
$oid = $this->querySegmentListBuilder->getStore()->getObjectIds()->getSMWPageID(
$description->getDataItem()->getDBkey(),
$description->getDataItem()->getNamespace(),
$description->getDataItem()->getInterwiki(),
$description->getDataItem()->getSubobjectName()
);
$query->joinfield = [ $oid ];
} else { // Join with SMW IDs table needed for other comparators (apply to title string).
$query->joinTable = SMWSql3SmwIds::TABLE_NAME;
$query->joinfield = "{$query->alias}.smw_id";
$comparator = $this->comparatorMapper->mapComparator(
$description,
$value
);
$db = $this->querySegmentListBuilder->getStore()->getConnection( 'mw.db.queryengine' );
$query->where = "{$query->alias}.smw_sortkey$comparator" . $db->addQuotes( $value );
}
return $query;
}
private function addFulltextSearchCondition( $description, $query, $comparator, &$value ) {
// Uses ~~ wide proximity?
$usesWidePromixity = false;
// If a remaining ~ is present then the user searched with a ~~ string
// where the Comparator already matched/removed the first one
if ( substr( $value, 0, 1 ) === '~' ) {
$value = substr( $value, 1 );
$usesWidePromixity = true;
}
// If it is not a wide proximity search and it doesn't have a property then
// don't try to match using the fulltext index (redirect [[~Foo]] to LIKE)
if ( !$usesWidePromixity && $description->getProperty() === null ) {
return false;
}
$valueMatchConditionBuilder = $this->fulltextSearchTableFactory->newValueMatchConditionBuilderByType(
$this->querySegmentListBuilder->getStore()
);
if ( !$valueMatchConditionBuilder->isEnabled() || !$valueMatchConditionBuilder->hasMinTokenLength( $value ) ) {
return false;
}
if ( !$usesWidePromixity && !$valueMatchConditionBuilder->canApplyFulltextSearchMatchCondition( $description ) ) {
return false;
}
$query->joinTable = $valueMatchConditionBuilder->getTableName();
$query->joinfield = "{$query->alias}.s_id";
$query->indexField = 's_id';
$query->components = [];
$query->where = $valueMatchConditionBuilder->getWhereCondition(
new ValueDescription( new DIBlob( $value ), null, $comparator ),
$query->alias
);
return $query;
}
}
|
