[gnome-games] generic: Add GenericUriGameSource

[Adrien Plazas <aplazas src gnome org>]

commit 4efeb39d2e62e5c259645d4d02eea2c9294dbbaf
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed May 3 20:09:20 2017 +0200

    generic: Add GenericUriGameSource
    
    This will be used in the next commit as a temporary transition helper
    between the game source model and the uri source and game factory model.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781334

 src/Makefile.am                          |    1 +
 src/generic/generic-uri-game-source.vala |   74 ++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 58cc040..dbb0477 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -90,6 +90,7 @@ gnome_games_SOURCES = \
        generic/generic-title.vala \
        generic/generic-uid.vala \
        generic/generic-uri-game-factory.vala \
+       generic/generic-uri-game-source.vala \
        \
        grilo/grilo-cover.vala \
        grilo/grilo-media.vala \
diff --git a/src/generic/generic-uri-game-source.vala b/src/generic/generic-uri-game-source.vala
new file mode 100644
index 0000000..03306c2
--- /dev/null
+++ b/src/generic/generic-uri-game-source.vala
@@ -0,0 +1,74 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+public class Games.GenericUriGameSource : Object, GameSource {
+       private UriSource[] sources;
+       private UriGameFactory[] factories;
+
+       private HashTable<string, Array<UriGameFactory>> factories_for_mime_type;
+
+       construct {
+               factories_for_mime_type = new HashTable<string, Array<UriGameFactory>> (str_hash, str_equal);
+       }
+
+       public void add_source (UriSource source) {
+               sources += source;
+       }
+
+       public void add_factory (UriGameFactory factory) {
+               factories += factory;
+
+               foreach (var mime_type in factory.get_mime_types ()) {
+                       if (!factories_for_mime_type.contains (mime_type))
+                               factories_for_mime_type[mime_type] = new Array<UriGameFactory> ();
+                       factories_for_mime_type[mime_type].append_val (factory);
+               }
+       }
+
+       public async void each_game (GameCallback callback) {
+               foreach (var source in sources)
+                       foreach (var uri in source)
+                               yield add_uri (uri);
+
+               foreach (var factory in factories)
+                       yield factory.foreach_game (callback);
+       }
+
+       private async void add_uri (string uri) {
+               Idle.add (add_uri.callback);
+               yield;
+
+               if (uri.has_prefix ("file:")) {
+                       try {
+                               yield add_file (uri);
+                       }
+                       catch (Error e) {
+                               debug (e.message);
+                       }
+
+                       return;
+               }
+               // TODO Add support for URN and other schemes.
+       }
+
+       private async void add_file (string uri) throws Error {
+               var file = File.new_for_uri (uri);
+               if (!file.query_exists ())
+                       return;
+
+               var file_info = file.query_info (FileAttribute.STANDARD_CONTENT_TYPE, 
FileQueryInfoFlags.NONE);
+               var mime_type = file_info.get_content_type ();
+               if (!factories_for_mime_type.contains (mime_type))
+                       return;
+
+               foreach (var factory in factories_for_mime_type[mime_type].data)
+                       yield add_uri_to_factory (factory, uri);
+       }
+
+       private async void add_uri_to_factory (UriGameFactory factory, string uri) {
+               if (factory.is_uri_valid (uri))
+                       factory.add_uri (uri);
+
+               Idle.add (add_uri_to_factory.callback);
+               yield;
+       }
+}