[gnome-games] gameinfo: Add GameinfoDiscIdGameTitle

[Adrien Plazas <aplazas src gnome org>]

commit 09bcdcf2398cbca5e03a36dcd52f90ea3f76bf37
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Aug 19 21:36:26 2016 +0200

    gameinfo: Add GameinfoDiscIdGameTitle
    
    This will be used in a subsequent commit to get a game's title from a
    Gameinfo document and a disc ID.

 src/Makefile.am                               |    1 +
 src/gameinfo/gameinfo-disc-id-game-title.vala |   23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 202c079..22de1bf 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -60,6 +60,7 @@ gnome_games_SOURCES = \
        \
        gameinfo/gameinfo-doc.vala \
        gameinfo/gameinfo-error.vala \
+       gameinfo/gameinfo-disc-id-game-title.vala \
        \
        gamepad/gamepad.vala \
        gamepad/gamepad-callbacks.vala \
diff --git a/src/gameinfo/gameinfo-disc-id-game-title.vala b/src/gameinfo/gameinfo-disc-id-game-title.vala
new file mode 100644
index 0000000..9ba6123
--- /dev/null
+++ b/src/gameinfo/gameinfo-disc-id-game-title.vala
@@ -0,0 +1,23 @@
+// This file is part of GNOME Games. License: GPLv3
+
+public class Games.GameinfoDiscIdGameTitle : Object, Title {
+       private GameinfoDoc gameinfo;
+       private string disc_id;
+       private string? domain;
+       private string title;
+
+       public GameinfoDiscIdGameTitle (GameinfoDoc gameinfo, string disc_id, string? domain = null) {
+               this.gameinfo = gameinfo;
+               this.disc_id = disc_id;
+               this.domain = domain;
+       }
+
+       public string get_title () throws Error {
+               if (title != null)
+                       return dgettext (domain, title);
+
+               title = gameinfo.get_game_title_for_disc_id (disc_id);
+
+               return dgettext (domain, title);
+       }
+}