From 2e2bbdd7b5814a5dfbf9f80baa57f7d88e5e9024 Mon Sep 17 00:00:00 2001
From: ibaker <ibaker@google.com>
Date: Wed, 8 Jun 2022 08:31:29 +0000
Subject: [PATCH] Clarify that `ShuffleOrder` must be consistent in both
 directions

#minor-release

PiperOrigin-RevId: 453622964
(cherry picked from commit 2c2be2da92b5cbefa81e5960d7f39f01979a2a78)
---
 .../com/google/android/exoplayer2/source/ShuffleOrder.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git 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
index e8f804fbe0..9c4e502dad 100644
--- 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 {