Set context description for autoplay stations

Author: devgianlu

core/src/main/java/xyz/gianlu/librespot/player/Player.java

@@ -533,18 +533,22 @@ private void loadAutoplay() {
             return;
         }
 
+        String contextDesc = state.getContextMetadata("context_description");
+
         try {
             MercuryClient.Response resp = session.mercury().sendSync(MercuryRequests.autoplayQuery(context));
             if (resp.statusCode == 200) {
                 String newContext = resp.payload.readIntoString(0);
                 state.loadContext(newContext);
+                state.setContextMetadata("context_description", contextDesc);
 
                 loadTrack(true, PushToMixerReason.None);
 
                 LOGGER.debug(String.format("Loading context for autoplay, uri: %s", newContext));
             } else if (resp.statusCode == 204) {
                 MercuryRequests.StationsWrapper station = session.mercury().sendSync(MercuryRequests.getStationFor(context));
                 state.loadContextWithTracks(station.uri(), station.tracks());
+                state.setContextMetadata("context_description", contextDesc);
 
                 loadTrack(true, PushToMixerReason.None);
 

core/src/main/java/xyz/gianlu/librespot/player/StateWrapper.java

@@ -289,6 +289,10 @@ synchronized int getVolume() {
         return device.getVolume();
     }
 
+    void setVolume(int val) {
+        device.setVolume(val);
+    }
+
     synchronized void enrichWithMetadata(@NotNull Metadata.Track track) {
         if (state.getTrack() == null) throw new IllegalStateException();
         if (!state.getTrack().getUri().equals(PlayableId.from(track).toSpotifyUri())) {
@@ -664,8 +668,14 @@ private synchronized void performCollectionUpdate(@NotNull List<String> uris, bo
             tracksKeeper.updateMetadataFor(uri, "collection.in_collection", String.valueOf(inCollection));
     }
 
-    void setVolume(int val) {
-        device.setVolume(val);
+    @Nullable
+    public String getContextMetadata(@NotNull String key) {
+        return state.getContextMetadataOrDefault(key, null);
+    }
+
+    public void setContextMetadata(@NotNull String key, @Nullable String value) {
+        if (value == null) state.removeContextMetadata(key);
+        else state.putContextMetadata(key, value);
     }
 
     public enum PreviousPlayable {