[tracker/parser] SPARQL: Support DROP GRAPH

[Jürg Billeter <juergbi src gnome org>]

commit ed7463acabe061f526ce1683116af4ea13cc3276
Author: Jürg Billeter <j bitron ch>
Date:   Mon Aug 10 11:11:31 2009 +0200

    SPARQL: Support DROP GRAPH

 src/libtracker-data/tracker-sparql-query.vala |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index 68f469b..659c4a9 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -459,7 +459,7 @@ public class Tracker.SparqlQuery : Object {
 					} else if (current () == SparqlTokenType.DELETE) {
 						execute_delete ();
 					} else if (current () == SparqlTokenType.DROP) {
-						// Data.delete_resource_description (operation.get_data_graph (0).name_uri.as_string ());
+						execute_drop_graph ();
 					} else {
 						throw new SparqlError.PARSE ("SELECT, CONSTRUCT, DESCRIBE, and ASK are not supported in update mode");
 					}
@@ -817,6 +817,16 @@ public class Tracker.SparqlQuery : Object {
 		}
 	}
 
+	void execute_drop_graph () throws Error {
+		expect (SparqlTokenType.DROP);
+		expect (SparqlTokenType.GRAPH);
+
+		bool is_var;
+		string uri = parse_var_or_term (out is_var);
+
+		Data.delete_resource_description (uri);
+	}
+
 	string parse_var_or_term (out bool is_var) throws SparqlError {
 		string result = "";
 		is_var = false;