1 files changed, 112 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/ConceptQuerySegmentBuilder.php b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/ConceptQuerySegmentBuilder.php
new file mode 100644
index 00000000..107c6b3b
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/ConceptQuerySegmentBuilder.php
@@ -0,0 +1,112 @@
+<?php
+
+namespace SMW\SQLStore\QueryEngine;
+
+use RuntimeException;
+use SMW\Query\Parser as QueryParser;
+use SMWQuery as Query;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.2
+ *
+ * @author mwjames
+ */
+class ConceptQuerySegmentBuilder {
+
+	/**
+	 * @var QuerySegmentListBuilder
+	 */
+	private $querySegmentListBuilder;
+
+	/**
+	 * @var QuerySegmentListProcessor
+	 */
+	private $querySegmentListProcessor;
+
+	/**
+	 * @var QueryParser
+	 */
+	private $queryParser;
+
+	/**
+	 * @since 2.2
+	 *
+	 * @param QuerySegmentListBuilder $querySegmentListBuilder
+	 * @param QuerySegmentListProcessor $querySegmentListProcessor
+	 */
+	public function __construct( QuerySegmentListBuilder $querySegmentListBuilder, QuerySegmentListProcessor $querySegmentListProcessor ) {
+		$this->querySegmentListBuilder = $querySegmentListBuilder;
+		$this->querySegmentListProcessor = $querySegmentListProcessor;
+	}
+
+	/**
+	 * @since 3.0
+	 *
+	 * @param QueryParser $queryParser
+	 */
+	public function setQueryParser( QueryParser $queryParser ) {
+		$this->queryParser = $queryParser;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @param string $conceptDescriptionText
+	 *
+	 * @return QuerySegment|null
+	 */
+	public function getQuerySegmentFrom( $conceptDescriptionText ) {
+
+		QuerySegment::$qnum = 0;
+
+		$querySegmentListBuilder = $this->querySegmentListBuilder;
+		$querySegmentListBuilder->setSortKeys( [] );
+
+		if ( $this->queryParser === null ) {
+			throw new RuntimeException( 'Missing a QueryParser instance' );
+		}
+
+		$querySegmentListBuilder->getQuerySegmentFrom(
+			$this->queryParser->getQueryDescription( $conceptDescriptionText )
+		);
+
+		$qid = $querySegmentListBuilder->getLastQuerySegmentId();
+		$querySegmentList = $querySegmentListBuilder->getQuerySegmentList();
+
+		if ( $qid < 0 ) {
+			return null;
+		}
+
+		// execute query tree, resolve all dependencies
+		$this->querySegmentListProcessor->setQueryMode(
+			Query::MODE_INSTANCES
+		);
+
+		$this->querySegmentListProcessor->setQuerySegmentList(
+			$querySegmentList
+		);
+
+		$this->querySegmentListProcessor->process( $qid );
+
+		return $querySegmentList[$qid];
+	}
+
+	/**
+	 * @since 2.2
+	 */
+	public function cleanUp() {
+		$this->querySegmentListProcessor->setQueryMode( Query::MODE_INSTANCES );
+		$this->querySegmentListProcessor->cleanUp();
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @return array
+	 */
+	public function getErrors() {
+		return $this->querySegmentListBuilder->getErrors();
+	}
+
+}