1 files changed, 155 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QuerySegmentListBuildManager.php b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QuerySegmentListBuildManager.php
new file mode 100644
index 00000000..fd9c8577
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QuerySegmentListBuildManager.php
@@ -0,0 +1,155 @@
+<?php
+
+namespace SMW\SQLStore\QueryEngine;
+
+use SMW\MediaWiki\Database;
+use SMW\SQLStore\SQLStore;
+use SMWQuery as Query;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.5
+ *
+ * @author Markus Krötzsch
+ * @author mwjames
+ */
+class QuerySegmentListBuildManager {
+
+	/**
+	 * @var QuerySegment[]
+	 */
+	private $querySegmentList = [];
+
+	/**
+	 * @var string[]
+	 */
+	private $errors = [];
+
+	/**
+	 * @var string[]
+	 */
+	private $sortKeys;
+
+	/**
+	 * @var QuerySegmentListBuilder
+	 */
+	private $querySegmentListBuilder;
+
+	/**
+	 * @var OrderCondition
+	 */
+	private $orderCondition;
+
+	/**
+	 * @since 2.5
+	 *
+	 * @param Database $connection
+	 * @param QuerySegmentListBuilder $querySegmentListBuilder
+	 * @param OrderCondition $orderCondition
+	 */
+	public function __construct( Database $connection, QuerySegmentListBuilder $querySegmentListBuilder, OrderCondition $orderCondition ) {
+		$this->connection = $connection;
+		$this->querySegmentListBuilder = $querySegmentListBuilder;
+		$this->orderCondition = $orderCondition;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @return string[]
+	 */
+	public function getSortKeys() {
+		return $this->sortKeys;
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @return array
+	 */
+	public function getErrors() {
+		return $this->errors;
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @return array
+	 */
+	public function getQuerySegmentList() {
+		return $this->querySegmentList;
+	}
+
+	/**
+	 * Compute abstract representation of the query (compilation)
+	 *
+	 * @param Query $query
+	 *
+	 * @return integer
+	 */
+	public function getQuerySegmentFrom( Query $query ) {
+
+		$this->sortKeys = $query->sortkeys;
+
+		// Anchor IT_TABLE as root element
+		$rootSegmentNumber = QuerySegment::$qnum;
+		$rootSegment = new QuerySegment();
+		$rootSegment->joinTable = SQLStore::ID_TABLE;
+		$rootSegment->joinfield = "$rootSegment->alias.smw_id";
+
+		$this->querySegmentListBuilder->addQuerySegment(
+			$rootSegment
+		);
+
+		$this->querySegmentListBuilder->setSortKeys(
+			$this->sortKeys
+		);
+
+		// compile query, build query "plan"
+		$this->querySegmentListBuilder->getQuerySegmentFrom(
+			$query->getDescription()
+		);
+
+		$qid = $this->querySegmentListBuilder->getLastQuerySegmentId();
+		$this->querySegmentList = $this->querySegmentListBuilder->getQuerySegmentList();
+		$this->errors = $this->querySegmentListBuilder->getErrors();
+
+		// no valid/supported condition; ensure that at least only proper pages
+		// are delivered
+		if ( $qid < 0 ) {
+			$qid = $rootSegmentNumber;
+			$qobj = $this->querySegmentList[$rootSegmentNumber];
+			$qobj->where = "$qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWIW_OUTDATED ) .
+				" AND $qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWREDIIW ) .
+				" AND $qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWBORDERIW ) .
+				" AND $qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWINTDEFIW );
+			$this->querySegmentListBuilder->addQuerySegment( $qobj );
+		}
+
+		if ( isset( $this->querySegmentList[$qid]->joinTable ) && $this->querySegmentList[$qid]->joinTable != SQLStore::ID_TABLE ) {
+			// manually make final root query (to retrieve namespace,title):
+			$rootid = $rootSegmentNumber;
+			$qobj = $this->querySegmentList[$rootSegmentNumber];
+			$qobj->components = [ $qid => "$qobj->alias.smw_id" ];
+			$qobj->sortfields = $this->querySegmentList[$qid]->sortfields;
+			$this->querySegmentListBuilder->addQuerySegment( $qobj );
+		} else { // not such a common case, but worth avoiding the additional inner join:
+			$rootid = $qid;
+		}
+
+		$this->orderCondition->setSortKeys(
+			$this->sortKeys
+		);
+
+		// Include order conditions (may extend query if needed for sorting):
+		$this->querySegmentList = $this->orderCondition->apply(
+			$rootid
+		);
+
+		$this->sortKeys = $this->orderCondition->getSortKeys();
+		$this->errors = $this->orderCondition->getErrors();
+
+		return $rootid;
+	}
+
+}