[gnome-games] game: Add hash and equal functions

[Adrien Plazas <aplazas src gnome org>]

commit eb863a774fd88e21af6a7c8a7f31520eb196b6fd
Author: theawless <theawless gmail com>
Date:   Thu Jul 19 18:43:52 2018 +0530

    game: Add hash and equal functions
    
    These will allow hashing and comparing objects that implement Game
    interface.

 src/core/game.vala | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
---
diff --git a/src/core/game.vala b/src/core/game.vala
index f2608a1..e00274e 100644
--- a/src/core/game.vala
+++ b/src/core/game.vala
@@ -11,4 +11,39 @@ public interface Games.Game : Object {
        public abstract Genre get_genre ();
        public abstract Players get_players ();
        public abstract Runner get_runner () throws Error;
+
+       public static uint hash (Game key) {
+               var uid = "";
+               try {
+                       uid = key.get_uid ().get_uid ();
+               }
+               catch (Error e) {
+                       critical (e.message);
+               }
+
+               return str_hash (uid);
+       }
+
+       public static bool equal (Game a, Game b) {
+               if (direct_equal (a, b))
+                       return true;
+
+               var a_uid = "";
+               try {
+                       a_uid = a.get_uid ().get_uid ();
+               }
+               catch (Error e) {
+                       critical (e.message);
+               }
+
+               var b_uid = "";
+               try {
+                       b_uid = b.get_uid ().get_uid ();
+               }
+               catch (Error e) {
+                       critical (e.message);
+               }
+
+               return str_equal (a_uid, b_uid);
+       }
 }