1 files changed, 169 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QuerySegment.php b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QuerySegment.php
new file mode 100644
index 00000000..ce176410
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QuerySegment.php
@@ -0,0 +1,169 @@
+<?php
+
+namespace SMW\SQLStore\QueryEngine;
+
+/**
+ * Class for representing a single (sub)query description.
+ *
+ * @license GNU GPL v2+
+ * @since 2.2
+ *
+ * @author Markus Krötzsch
+ * @author Jeroen De Dauw
+ */
+class QuerySegment {
+
+	/**
+	 * Type of empty query without usable condition, dropped as soon as
+	 * discovered. This is used only during preparing the query (no
+	 * queries of this type should ever be added).
+	 */
+	const Q_NOQUERY = 0;
+
+	/**
+	 * Type of query that is a join with a query (jointable: internal
+	 * table name; joinfield/components/where use alias.fields;
+	 * from uses external table names, components interpreted
+	 * conjunctively (JOIN)).
+	 */
+	const Q_TABLE = 1;
+
+	/**
+	 * Type of query that matches a constant value (joinfield is a
+	 * disjunctive array of unquoted values, jointable empty, components
+	 * empty).
+	 */
+	const Q_VALUE = 2;
+
+	/**
+	 * Type of query that is a disjunction of other queries
+	 * (joinfield/jointable empty; only components relevant)
+	 */
+	const Q_DISJUNCTION = 3;
+
+	/**
+	 * Type of query that is a conjunction of other queries
+	 * (joinfield/jointable empty; only components relevant).
+	 */
+	const Q_CONJUNCTION = 4;
+
+	/**
+	 * Type of query that creates a temporary table of all superclasses
+	 * of given classes (only joinfield relevant: (disjunctive) array of
+	 * unquoted values).
+	 */
+	const Q_CLASS_HIERARCHY = 5;
+
+	/**
+	 * Type of query that creates a temporary table of all superproperties
+	 * of given properties (only joinfield relevant: (disjunctive) array
+	 * of unquoted values).
+	 */
+	const Q_PROP_HIERARCHY = 6;
+
+	/**
+	 * @var integer
+	 */
+	public $type = self::Q_TABLE;
+
+	/**
+	 * @var integer|null
+	 */
+	public $depth;
+
+	/**
+	 * @var string
+	 */
+	public $fingerprint = '';
+
+	/**
+	 * @var boolean
+	 */
+	public $null = false;
+
+	/**
+	 * @var boolean
+	 */
+	public $not = false;
+
+	/**
+	 * @var string
+	 */
+	public $joinType = '';
+
+	/**
+	 * @var string
+	 */
+	public $joinTable = '';
+
+	/**
+	 * @var string|array
+	 */
+	public $joinfield = '';
+
+	/**
+	 * Allows to define an index field, for example in case when a sub-query rewires
+	 * a match condition.
+	 *
+	 * @var string
+	 */
+	public $indexField = '';
+
+	/**
+	 * @var string
+	 */
+	public $from = '';
+
+	/**
+	 * @var string
+	 */
+	public $where = '';
+
+	/**
+	 * @var string[]
+	 */
+	public $components = [];
+
+	/**
+	 * The alias to be used for jointable; read-only after construct!
+	 * @var string
+	 */
+	public $alias;
+
+	/**
+	 * property dbkey => db field; passed down during query execution.
+	 * @var string[]
+	 */
+	public $sortfields = [];
+
+	/**
+	 * @var integer
+	 */
+	public $queryNumber;
+
+	/**
+	 * @var integer
+	 */
+	public static $qnum = 0;
+
+	/**
+	 * @since 2.2
+	 */
+	public function __construct() {
+		$this->queryNumber = self::$qnum;
+		$this->alias = 't' . self::$qnum;
+		self::$qnum++;
+	}
+
+	/**
+	 * @since 2.2
+	 */
+	public function reset() {
+		self::$qnum = 0;
+
+		$this->queryNumber = self::$qnum;
+		$this->alias = 't' . self::$qnum;
+		self::$qnum++;
+	}
+
+}