1 files changed, 81 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/QueryEngine/DescriptionInterpreters/NamespaceDescriptionInterpreter.php b/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/QueryEngine/DescriptionInterpreters/NamespaceDescriptionInterpreter.php
new file mode 100644
index 00000000..a898a733
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/QueryEngine/DescriptionInterpreters/NamespaceDescriptionInterpreter.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace SMW\SPARQLStore\QueryEngine\DescriptionInterpreters;
+
+use SMW\Query\Language\Description;
+use SMW\Query\Language\NamespaceDescription;
+use SMW\SPARQLStore\QueryEngine\Condition\WhereCondition;
+use SMW\SPARQLStore\QueryEngine\ConditionBuilder;
+use SMW\SPARQLStore\QueryEngine\DescriptionInterpreter;
+use SMWDataItem as DataItem;
+use SMWExpLiteral as ExpLiteral;
+use SMWExporter as Exporter;
+use SMWTurtleSerializer as TurtleSerializer;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.1
+ *
+ * @author Markus Krötzsch
+ * @author mwjames
+ */
+class NamespaceDescriptionInterpreter implements DescriptionInterpreter {
+
+	/**
+	 * @var ConditionBuilder
+	 */
+	private $conditionBuilder;
+
+	/**
+	 * @var Exporter
+	 */
+	private $exporter;
+
+	/**
+	 * @since 2.1
+	 *
+	 * @param ConditionBuilder|null $conditionBuilder
+	 */
+	public function __construct( ConditionBuilder $conditionBuilder = null ) {
+		$this->conditionBuilder = $conditionBuilder;
+		$this->exporter = Exporter::getInstance();
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * {@inheritDoc}
+	 */
+	public function canInterpretDescription( Description $description ) {
+		return $description instanceof NamespaceDescription;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * {@inheritDoc}
+	 */
+	public function interpretDescription( Description $description ) {
+
+		$joinVariable = $this->conditionBuilder->getJoinVariable();
+		$orderByProperty = $this->conditionBuilder->getOrderByProperty();
+
+		$nspropExpElement = $this->exporter->getSpecialNsResource( 'swivt', 'wikiNamespace' );
+		$nsExpElement = new ExpLiteral( strval( $description->getNamespace() ), 'http://www.w3.org/2001/XMLSchema#integer' );
+
+		$nsName = TurtleSerializer::getTurtleNameForExpElement( $nsExpElement );
+		$condition = "{ ?$joinVariable " . $nspropExpElement->getQName() . " $nsName . }\n";
+
+		$result = new WhereCondition( $condition, true, [] );
+
+		$this->conditionBuilder->addOrderByDataForProperty(
+			$result,
+			$joinVariable,
+			$orderByProperty,
+			DataItem::TYPE_WIKIPAGE
+		);
+
+		return $result;
+	}
+
+}