[tracker] TrackerSparqlExpression: add tracker:uri-is-parent/descendant() sparql functions.

[Martyn James Russell <mr src gnome org>]

commit 293d97957c4ee629f01757b2c3019230373c4d73
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Apr 21 15:38:06 2010 +0200

    TrackerSparqlExpression: add tracker:uri-is-parent/descendant() sparql functions.

 src/libtracker-data/tracker-sparql-expression.vala |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-expression.vala b/src/libtracker-data/tracker-sparql-expression.vala
index 31f6f1c..853babc 100644
--- a/src/libtracker-data/tracker-sparql-expression.vala
+++ b/src/libtracker-data/tracker-sparql-expression.vala
@@ -623,6 +623,26 @@ class Tracker.Sparql.Expression : Object {
 			sql.append (")");
 
 			return PropertyType.STRING;
+		} else if (uri == TRACKER_NS + "uri-is-parent") {
+			sql.append ("SparqlUriIsParent(");
+			translate_expression_as_string (sql);
+			sql.append (", ");
+			expect (SparqlTokenType.COMMA);
+
+			translate_expression_as_string (sql);
+			sql.append (")");
+
+			return PropertyType.BOOLEAN;
+		} else if (uri == TRACKER_NS + "uri-is-descendant") {
+			sql.append ("SparqlUriIsDescendant(");
+			translate_expression_as_string (sql);
+			sql.append (", ");
+			expect (SparqlTokenType.COMMA);
+
+			translate_expression_as_string (sql);
+			sql.append (")");
+
+			return PropertyType.BOOLEAN;
 		} else if (uri == TRACKER_NS + "string-from-filename") {
 			sql.append ("SparqlStringFromFilename(");
 			translate_expression_as_string (sql);