fix(playlist): allow to extend the has-total interface

dargmuesli · dargmuesli · commit 57276ddd270b · 2026-04-29T07:58:30.000+02:00
diff --git a/src/main/java/se/michaelthelin/spotify/model_objects/interfaces/IPlaylist.java b/src/main/java/se/michaelthelin/spotify/model_objects/interfaces/IPlaylist.java
@@ -12,8 +12,13 @@
  *
  * <p>This interface provides a common base for {@link Playlist} and
  * {@link PlaylistSimplified} objects.
+ *
+ * @param <T> The concrete type of the items/tracks metadata object. {@link Playlist} uses
+ *            {@link se.michaelthelin.spotify.model_objects.specification.Paging} and
+ *            {@link PlaylistSimplified} uses
+ *            {@link se.michaelthelin.spotify.model_objects.miscellaneous.PlaylistTracksInformation}.
  */
-public interface IPlaylist {
+public interface IPlaylist<T extends IHasTotal> {
   /**
    * Check whether the owner allows other users to modify the playlist.
    *
@@ -93,7 +98,7 @@ public interface IPlaylist {
    *
    * @return Item information containing total count.
    */
-  IHasTotal getItems();
+  T getItems();
 
   /**
    * Get the snapshot ID, the version identifier for the current playlist. Can be supplied in other requests to target
diff --git a/src/main/java/se/michaelthelin/spotify/model_objects/specification/Playlist.java b/src/main/java/se/michaelthelin/spotify/model_objects/specification/Playlist.java
@@ -15,7 +15,7 @@
  * Playlist objects</a> by building instances from this class.
  */
 @JsonDeserialize(builder = Playlist.Builder.class)
-public class Playlist extends AbstractModelObject implements IPlaylist {
+public class Playlist extends AbstractModelObject implements IPlaylist<Paging<PlaylistTrack>> {
   /** Whether the playlist is collaborative. */
   private final Boolean collaborative;
   /** The description of the playlist. */
diff --git a/src/main/java/se/michaelthelin/spotify/model_objects/specification/PlaylistSimplified.java b/src/main/java/se/michaelthelin/spotify/model_objects/specification/PlaylistSimplified.java
@@ -17,7 +17,7 @@
  * simplified Playlist objects</a> by building instances from this class.
  */
 @JsonDeserialize(builder = PlaylistSimplified.Builder.class)
-public class PlaylistSimplified extends AbstractModelObject implements ISearchModelObject, IPlaylist {
+public class PlaylistSimplified extends AbstractModelObject implements ISearchModelObject, IPlaylist<PlaylistTracksInformation> {
   /** Whether the playlist is collaborative. */
   private final Boolean collaborative;
   /** The description of the playlist. */
