1 files changed, 169 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/DescriptionInterpreters/ValueDescriptionInterpreter.php b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/DescriptionInterpreters/ValueDescriptionInterpreter.php
new file mode 100644
index 00000000..0ea4ec12
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/DescriptionInterpreters/ValueDescriptionInterpreter.php
@@ -0,0 +1,169 @@
+<?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;
+	}
+
+}