1 files changed, 139 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/QueryEngine/DescriptionInterpreters/ConceptDescriptionInterpreter.php b/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/QueryEngine/DescriptionInterpreters/ConceptDescriptionInterpreter.php
new file mode 100644
index 00000000..8c78c922
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/QueryEngine/DescriptionInterpreters/ConceptDescriptionInterpreter.php
@@ -0,0 +1,139 @@
+<?php
+
+namespace SMW\SPARQLStore\QueryEngine\DescriptionInterpreters;
+
+use SMW\ApplicationFactory;
+use SMW\DIProperty;
+use SMW\DIWikiPage;
+use SMW\Query\Language\ConceptDescription;
+use SMW\Query\Language\Conjunction;
+use SMW\Query\Language\Description;
+use SMW\Query\Language\Disjunction;
+use SMW\SPARQLStore\QueryEngine\Condition\FalseCondition;
+use SMW\SPARQLStore\QueryEngine\ConditionBuilder;
+use SMW\SPARQLStore\QueryEngine\DescriptionInterpreter;
+use SMWExporter as Exporter;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.1
+ *
+ * @author Markus Krötzsch
+ * @author mwjames
+ */
+class ConceptDescriptionInterpreter 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 ConceptDescription;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * {@inheritDoc}
+	 */
+	public function interpretDescription( Description $description ) {
+
+		$joinVariable = $this->conditionBuilder->getJoinVariable();
+		$orderByProperty = $this->conditionBuilder->getOrderByProperty();
+
+		$conceptDescription = $this->getConceptDescription(
+			$description->getConcept()
+		);
+
+		if ( $conceptDescription === '' ) {
+			return new FalseCondition();
+		}
+
+		$hash = 'concept-' . $conceptDescription->getQueryString();
+
+		$this->conditionBuilder->getCircularReferenceGuard()->mark( $hash );
+
+		if ( $this->conditionBuilder->getCircularReferenceGuard()->isCircular( $hash ) ) {
+
+			$this->conditionBuilder->addError(
+				[ 'smw-query-condition-circular', $description->getQueryString() ]
+			);
+
+			return new FalseCondition();
+		}
+
+		$this->conditionBuilder->setJoinVariable( $joinVariable );
+		$this->conditionBuilder->setOrderByProperty( $orderByProperty );
+
+		$condition = $this->conditionBuilder->mapDescriptionToCondition(
+			$conceptDescription
+		);
+
+		$this->conditionBuilder->getCircularReferenceGuard()->unmark( $hash );
+
+		return $condition;
+	}
+
+	private function getConceptDescription( DIWikiPage $concept ) {
+
+		$applicationFactory = ApplicationFactory::getInstance();
+
+		$value = $applicationFactory->getStore()->getSemanticData( $concept )->getPropertyValues(
+			new DIProperty( '_CONC' )
+		);
+
+		if ( $value === null || $value === [] ) {
+			return '';
+		}
+
+		$value = end( $value );
+
+		$description = $applicationFactory->newQueryParser()->getQueryDescription(
+			$value->getConceptQuery()
+		);
+
+		$this->findCircularDescription( $concept, $description );
+
+		return $description;
+	}
+
+	private function findCircularDescription( $concept, $description ) {
+
+		if ( $description instanceof ConceptDescription ) {
+			if ( $description->getConcept()->equals( $concept ) ) {
+				$this->conditionBuilder->addError(
+					[ 'smw-query-condition-circular', $description->getQueryString() ]
+				);
+				return;
+			}
+		}
+
+		if ( $description instanceof Conjunction || $description instanceof Disjunction ) {
+			foreach ( $description->getDescriptions() as $desc ) {
+				$this->findCircularDescription( $concept, $desc );
+			}
+		}
+	}
+
+}