[gnome-games] collection: Introduce Collection

[Alexander Mikhaylenko <alexm src gnome org>]

commit 610c26cfb1d02c1852b13358c12e16be54ea4de8
Author: Neville <nevilleantony98 gmail com>
Date:   Thu Jun 18 20:40:08 2020 +0530

    collection: Introduce Collection
    
    This will provide a common interface for several different types of
    collections which will be introduced later on.

 src/collection/collection.vala | 25 +++++++++++++++++++++++++
 src/meson.build                |  2 ++
 2 files changed, 27 insertions(+)
---
diff --git a/src/collection/collection.vala b/src/collection/collection.vala
new file mode 100644
index 00000000..73b692b4
--- /dev/null
+++ b/src/collection/collection.vala
@@ -0,0 +1,25 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+private interface Games.Collection : Object {
+       public signal void games_changed ();
+
+       public abstract void load ();
+
+       public abstract string get_id ();
+
+       public abstract string get_title ();
+
+       public abstract bool get_hide_stars ();
+
+       public abstract GameModel get_game_model ();
+
+       public abstract void add_games (Game[] games);
+
+       public abstract void remove_games (Game[] games);
+
+       public abstract void on_game_added (Game game);
+
+       public abstract void on_game_removed (Game game);
+
+       public abstract void on_game_replaced (Game game, Game prev_game);
+}
diff --git a/src/meson.build b/src/meson.build
index 4cb22389..edc9ac0f 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -11,6 +11,8 @@ c_args = [
 ]
 
 vala_sources = [
+  'collection/collection.vala',
+
   'command/command-error.vala',
   'command/command-runner.vala',