[tracker] libtracker-common: Check when retrieving SPARQL builder result

[Jürg Billeter <juergbi src gnome org>]

commit 287ef6553b2a53d4e94f2424a180b6e434304b91
Author: Jürg Billeter <j bitron ch>
Date:   Tue Nov 17 13:50:55 2009 +0100

    libtracker-common: Check when retrieving SPARQL builder result
    
    Warn when retrieving SPARQL builder result in wrong state as, for
    example, with a missing insert_close call.

 src/libtracker-common/tracker-sparql-builder.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-common/tracker-sparql-builder.vala b/src/libtracker-common/tracker-sparql-builder.vala
index 09ef643..7c8761d 100644
--- a/src/libtracker-common/tracker-sparql-builder.vala
+++ b/src/libtracker-common/tracker-sparql-builder.vala
@@ -29,7 +29,10 @@ public class Tracker.SparqlBuilder : Object {
 	}
 
 	public string result {
-		get { return str.str; }
+		get {
+			warn_if_fail (states.length == 1);
+			return str.str;
+		}
 	}
 
 	public int length { get; private set; }