Clarify that `ShuffleOrder` must be consistent in both directions

#minor-release PiperOrigin-RevId: 453622964 (cherry picked from commit 2c2be2da)

Clarify that `ShuffleOrder` must be consistent in both directions
#minor-release PiperOrigin-RevId: 453622964 (cherry picked from commit 2c2be2da)
2e2bbdd7 · ibaker · Marc Baechinger · 68054de4 · 2e2bbdd7
Commit 2e2bbdd7 authored Jun 08, 2022 by ibaker Committed by Marc Baechinger Jun 09, 2022
Showing with 3 additions and 0 deletions
library/core/src/main/java/com/google/android/exoplayer2/source/ShuffleOrder.java
--- 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 {