[gnome-games] generic: Add GenericUriGameFactory

[Adrien Plazas <aplazas src gnome org>]

commit 719dceb4ad8a89aee3efbfb04b609d26936dccdb
Author: Ricard Gascons <gascons1995 gmail com>
Date:   Thu Aug 18 11:45:09 2016 +0200

    generic: Add GenericUriGameFactory
    
    This class abstracts the process of creating a game from a uri, so
    MimeTypeTrackerQuery does not have to deal with it.
    
    This is part of a series of commits to add multi-source support.

 src/Makefile.am                           |    1 +
 src/generic/generic-uri-game-factory.vala |   55 +++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index b3428c1..a501927 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -73,6 +73,7 @@ gnome_games_SOURCES = \
        generic/generic-sync-game-uri-adapter.vala \
        generic/generic-title.vala \
        generic/generic-uid.vala \
+       generic/generic-uri-game-factory.vala \
        \
        grilo/grilo-cover.vala \
        grilo/grilo-media.vala \
diff --git a/src/generic/generic-uri-game-factory.vala b/src/generic/generic-uri-game-factory.vala
new file mode 100644
index 0000000..577f805
--- /dev/null
+++ b/src/generic/generic-uri-game-factory.vala
@@ -0,0 +1,55 @@
+// This file is part of GNOME Games. License: GPLv3
+
+public class Games.GenericUriGameFactory : Object, UriGameFactory {
+       public delegate bool UriTest (string uri);
+       private const uint HANDLED_URIS_PER_CYCLE = 5;
+
+       private GameUriAdapter game_uri_adapter;
+       private UriTest? uri_validity_test;
+       private string[] uris;
+
+       public GenericUriGameFactory (GameUriAdapter game_uri_adapter, owned UriTest? uri_validity_test = 
null) {
+               this.game_uri_adapter = game_uri_adapter;
+               this.uri_validity_test = (owned) uri_validity_test;
+               this.uris = {};
+       }
+
+       public bool is_uri_valid (string uri) {
+               return uri_validity_test == null ? true : uri_validity_test (uri);
+       }
+
+       public void add_uri (string uri) {
+               uris += uri;
+       }
+
+       public async void foreach_game (GameCallback game_callback) {
+               uint handled_uris = 0;
+               foreach (var uri in uris) {
+                       var file = File.new_for_uri (uri);
+                       if (!file.query_exists ())
+                               continue;
+
+                       try {
+                               Game game = yield game_uri_adapter.game_for_uri (uri);
+                               game_callback (game);
+                       }
+                       catch (Error e) {
+                               debug (e.message);
+
+                               continue;
+                       }
+
+                       handled_uris++;
+
+                       // Free the execution only once every HANDLED_URIS_PER_CYCLE
+                       // games to speed up the execution by avoiding too many context
+                       // switching.
+                       if (handled_uris >= HANDLED_URIS_PER_CYCLE) {
+                               handled_uris = 0;
+
+                               Idle.add (this.foreach_game.callback);
+                               yield;
+                       }
+               }
+       }
+}