[gnome-games] generic: Add GenericUriGameSource.query_game_for_uri()

[Adrien Plazas <aplazas src gnome org>]

commit 58afbea3a1c3791eb6d7019c7228b225b54b14e3
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri May 5 11:18:03 2017 +0200

    generic: Add GenericUriGameSource.query_game_for_uri()
    
    This will allow to lookup a game for a given URI in a generic URI game
    source.
    
    This will be used int he next commits to run games directly from URIs
    passed via the command line.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=780320

 src/generic/generic-uri-game-source.vala |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/src/generic/generic-uri-game-source.vala b/src/generic/generic-uri-game-source.vala
index b68b9de..ffcc3b1 100644
--- a/src/generic/generic-uri-game-source.vala
+++ b/src/generic/generic-uri-game-source.vala
@@ -29,6 +29,20 @@ public class Games.GenericUriGameSource : Object, GameSource {
                        yield factory.add_uri (uri);
        }
 
+       public async Game? query_game_for_uri (string uri) {
+               Game[] games = {};
+               foreach (var factory in yield get_factories_for_uri (uri)) {
+                       var game = yield factory.query_game_for_uri (uri);
+                       if (game != null)
+                               games += game;
+               }
+
+               if (games.length != 1)
+                       return null;
+
+               return games[0];
+       }
+
        public async void each_game (GameCallback callback) {
                foreach (var source in sources)
                        foreach (var uri in source)