1 files changed, 66 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/DescriptionInterpreters/NamespaceDescriptionInterpreter.php b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/DescriptionInterpreters/NamespaceDescriptionInterpreter.php
new file mode 100644
index 00000000..b7b52d24
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/DescriptionInterpreters/NamespaceDescriptionInterpreter.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace SMW\SQLStore\QueryEngine\DescriptionInterpreters;
+
+use SMW\Query\Language\Description;
+use SMW\Query\Language\NamespaceDescription;
+use SMW\SQLStore\QueryEngine\DescriptionInterpreter;
+use SMW\SQLStore\QueryEngine\QuerySegment;
+use SMW\SQLStore\QueryEngine\QuerySegmentListBuilder;
+use SMWSql3SmwIds;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.2
+ *
+ * @author Markus Krötzsch
+ * @author Jeroen De Dauw
+ * @author mwjames
+ */
+class NamespaceDescriptionInterpreter implements DescriptionInterpreter {
+
+	/**
+	 * @var QuerySegmentListBuilder
+	 */
+	private $querySegmentListBuilder;
+
+	/**
+	 * @since 2.2
+	 *
+	 * @param QuerySegmentListBuilder $querySegmentListBuilder
+	 */
+	public function __construct( QuerySegmentListBuilder $querySegmentListBuilder ) {
+		$this->querySegmentListBuilder = $querySegmentListBuilder;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @return boolean
+	 */
+	public function canInterpretDescription( Description $description ) {
+		return $description instanceof NamespaceDescription;
+	}
+
+	/**
+	 * TODO: One instance of the SMW IDs table on s_id always suffices (swm_id is KEY)! Doable in execution ... (PERFORMANCE)
+	 *
+	 * @since 2.2
+	 *
+	 * @param Description $description
+	 *
+	 * @return QuerySegment
+	 */
+	public function interpretDescription( Description $description ) {
+
+		$db = $this->querySegmentListBuilder->getStore()->getConnection( 'mw.db.queryengine' );
+
+		$query = new QuerySegment();
+		$query->joinTable = SMWSql3SmwIds::TABLE_NAME;
+		$query->joinfield = "$query->alias.smw_id";
+		$query->where = "$query->alias.smw_namespace=" . $db->addQuotes( $description->getNamespace() );
+
+		return $query;
+	}
+
+}