Clarify that ShuffleOrder must be consistent in both directions

#minor-release PiperOrigin-RevId: 453622964 (cherry picked from commit 2c2be2da92b5cbefa81e5960d7f39f01979a2a78)
2022-06-08 08:31:29 +00:00 · 2022-06-08 08:31:29 +00:00 · 2e2bbdd7b5
commit 2e2bbdd7b5
parent 68054de481
1 changed files with 3 additions and 0 deletions
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ShuffleOrder.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ShuffleOrder.java
@ -23,6 +23,9 @@ import java.util.Random;
 * Shuffled order of indices.
 *
 * <p>The shuffle order must be immutable to ensure thread safety.
+ *
+ * <p>The order must be consistent when traversed both {@linkplain #getNextIndex(int) forwards} and
+ * {@linkplain #getPreviousIndex(int) backwards}.
 */
 public interface ShuffleOrder {