Proactively check listener arguments are non-null

PiperOrigin-RevId: 322143359

demos/main/src/main/java/com/google/android/exoplayer2/demo/DownloadTracker.java

@@ -76,6 +76,7 @@ public class DownloadTracker {
   }
 
   public void addListener(Listener listener) {
+    checkNotNull(listener);
     listeners.add(listener);
   }
 

extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java

@@ -291,6 +291,7 @@ public final class CastPlayer extends BasePlayer {
 
   @Override
   public void addListener(EventListener listener) {
+    Assertions.checkNotNull(listener);
     listeners.addIfAbsent(new ListenerHolder(listener));
   }
 

extensions/media2/src/main/java/com/google/android/exoplayer2/ext/media2/SettableFuture.java

@@ -51,6 +51,8 @@ import java.util.concurrent.atomic.AtomicReference;
 
   @Override
   public void addListener(Runnable listener, Executor executor) {
+    Assertions.checkNotNull(listener);
+    Assertions.checkNotNull(executor);
     future.addListener(listener, executor);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java

@@ -254,6 +254,7 @@ import java.util.concurrent.TimeoutException;
 
   @Override
   public void addListener(Player.EventListener listener) {
+    Assertions.checkNotNull(listener);
     listeners.addIfAbsent(new ListenerHolder(listener));
   }
 

library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java

@@ -820,6 +820,7 @@ public class SimpleExoPlayer extends BasePlayer
   @Override
   public void addAudioListener(AudioListener listener) {
     // Don't verify application thread. We allow calls to this method from any thread.
+    Assertions.checkNotNull(listener);
     audioListeners.add(listener);
   }
 
@@ -970,6 +971,7 @@ public class SimpleExoPlayer extends BasePlayer
    */
   public void addAnalyticsListener(AnalyticsListener listener) {
     // Don't verify application thread. We allow calls to this method from any thread.
+    Assertions.checkNotNull(listener);
     analyticsCollector.addListener(listener);
   }
 
@@ -1068,6 +1070,7 @@ public class SimpleExoPlayer extends BasePlayer
   @Override
   public void addVideoListener(com.google.android.exoplayer2.video.VideoListener listener) {
     // Don't verify application thread. We allow calls to this method from any thread.
+    Assertions.checkNotNull(listener);
     videoListeners.add(listener);
   }
 
@@ -1121,7 +1124,7 @@ public class SimpleExoPlayer extends BasePlayer
    */
   @Deprecated
   @SuppressWarnings("deprecation")
-  public void setVideoListener(VideoListener listener) {
+  public void setVideoListener(@Nullable VideoListener listener) {
     videoListeners.clear();
     if (listener != null) {
       addVideoListener(listener);
@@ -1144,6 +1147,7 @@ public class SimpleExoPlayer extends BasePlayer
   @Override
   public void addTextOutput(TextOutput listener) {
     // Don't verify application thread. We allow calls to this method from any thread.
+    Assertions.checkNotNull(listener);
     textOutputs.add(listener);
   }
 
@@ -1187,6 +1191,7 @@ public class SimpleExoPlayer extends BasePlayer
   @Override
   public void addMetadataOutput(MetadataOutput listener) {
     // Don't verify application thread. We allow calls to this method from any thread.
+    Assertions.checkNotNull(listener);
     metadataOutputs.add(listener);
   }
 
@@ -1227,7 +1232,7 @@ public class SimpleExoPlayer extends BasePlayer
    */
   @Deprecated
   @SuppressWarnings("deprecation")
-  public void setVideoDebugListener(VideoRendererEventListener listener) {
+  public void setVideoDebugListener(@Nullable VideoRendererEventListener listener) {
     videoDebugListeners.retainAll(Collections.singleton(analyticsCollector));
     if (listener != null) {
       addVideoDebugListener(listener);
@@ -1240,6 +1245,7 @@ public class SimpleExoPlayer extends BasePlayer
    */
   @Deprecated
   public void addVideoDebugListener(VideoRendererEventListener listener) {
+    Assertions.checkNotNull(listener);
     videoDebugListeners.add(listener);
   }
 
@@ -1258,7 +1264,7 @@ public class SimpleExoPlayer extends BasePlayer
    */
   @Deprecated
   @SuppressWarnings("deprecation")
-  public void setAudioDebugListener(AudioRendererEventListener listener) {
+  public void setAudioDebugListener(@Nullable AudioRendererEventListener listener) {
     audioDebugListeners.retainAll(Collections.singleton(analyticsCollector));
     if (listener != null) {
       addAudioDebugListener(listener);
@@ -1271,6 +1277,7 @@ public class SimpleExoPlayer extends BasePlayer
    */
   @Deprecated
   public void addAudioDebugListener(AudioRendererEventListener listener) {
+    Assertions.checkNotNull(listener);
     audioDebugListeners.add(listener);
   }
 
@@ -1298,6 +1305,7 @@ public class SimpleExoPlayer extends BasePlayer
   @Override
   public void addListener(Player.EventListener listener) {
     // Don't verify application thread. We allow calls to this method from any thread.
+    Assertions.checkNotNull(listener);
     player.addListener(listener);
   }
 
@@ -1866,6 +1874,7 @@ public class SimpleExoPlayer extends BasePlayer
   @Override
   public void addDeviceListener(DeviceListener listener) {
     // Don't verify application thread. We allow calls to this method from any thread.
+    Assertions.checkNotNull(listener);
     deviceListeners.add(listener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/analytics/AnalyticsCollector.java

@@ -101,6 +101,7 @@ public class AnalyticsCollector
    * @param listener The listener to add.
    */
   public void addListener(AnalyticsListener listener) {
+    Assertions.checkNotNull(listener);
     listeners.add(listener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadManager.java

@@ -324,6 +324,7 @@ public final class DownloadManager {
    * @param listener The listener to be added.
    */
   public void addListener(Listener listener) {
+    Assertions.checkNotNull(listener);
     listeners.add(listener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/source/BaseMediaSource.java

@@ -162,6 +162,8 @@ public abstract class BaseMediaSource implements MediaSource {
 
   @Override
   public final void addEventListener(Handler handler, MediaSourceEventListener eventListener) {
+    Assertions.checkNotNull(handler);
+    Assertions.checkNotNull(eventListener);
     eventDispatcher.addEventListener(handler, eventListener);
   }
 
@@ -172,6 +174,8 @@ public abstract class BaseMediaSource implements MediaSource {
 
   @Override
   public final void addDrmEventListener(Handler handler, DrmSessionEventListener eventListener) {
+    Assertions.checkNotNull(handler);
+    Assertions.checkNotNull(eventListener);
     drmEventDispatcher.addEventListener(handler, eventListener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/source/IcyDataSource.java

@@ -67,6 +67,7 @@ import java.util.Map;
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    Assertions.checkNotNull(transferListener);
     upstream.addTransferListener(transferListener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/upstream/BandwidthMeter.java

@@ -56,10 +56,11 @@ public interface BandwidthMeter {
       }
 
       /** Adds a listener to the event dispatcher. */
-      public void addListener(Handler handler, BandwidthMeter.EventListener eventListener) {
-        Assertions.checkArgument(handler != null && eventListener != null);
+      public void addListener(Handler eventHandler, BandwidthMeter.EventListener eventListener) {
+        Assertions.checkNotNull(eventHandler);
+        Assertions.checkNotNull(eventListener);
         removeListener(eventListener);
-        listeners.add(new HandlerAndListener(handler, eventListener));
+        listeners.add(new HandlerAndListener(eventHandler, eventListener));
       }
 
       /** Removes a listener from the event dispatcher. */

library/core/src/main/java/com/google/android/exoplayer2/upstream/BaseDataSource.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.upstream;
 
+import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Util.castNonNull;
 
 import androidx.annotation.Nullable;
@@ -47,6 +48,7 @@ public abstract class BaseDataSource implements DataSource {
 
   @Override
   public final void addTransferListener(TransferListener transferListener) {
+    checkNotNull(transferListener);
     if (!listeners.contains(transferListener)) {
       listeners.add(transferListener);
       listenerCount++;

library/core/src/main/java/com/google/android/exoplayer2/upstream/DefaultBandwidthMeter.java

@@ -332,6 +332,8 @@ public final class DefaultBandwidthMeter implements BandwidthMeter, TransferList
 
   @Override
   public void addEventListener(Handler eventHandler, EventListener eventListener) {
+    Assertions.checkNotNull(eventHandler);
+    Assertions.checkNotNull(eventListener);
     eventDispatcher.addListener(eventHandler, eventListener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/upstream/DefaultDataSource.java

@@ -135,6 +135,7 @@ public final class DefaultDataSource implements DataSource {
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    Assertions.checkNotNull(transferListener);
     baseDataSource.addTransferListener(transferListener);
     transferListeners.add(transferListener);
     maybeAddListenerToDataSource(fileDataSource, transferListener);

library/core/src/main/java/com/google/android/exoplayer2/upstream/PriorityDataSource.java

@@ -55,6 +55,7 @@ public final class PriorityDataSource implements DataSource {
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    Assertions.checkNotNull(transferListener);
     upstream.addTransferListener(transferListener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/upstream/ResolvingDataSource.java

@@ -15,6 +15,8 @@
  */
 package com.google.android.exoplayer2.upstream;
 
+import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
+
 import android.net.Uri;
 import androidx.annotation.Nullable;
 import java.io.IOException;
@@ -95,6 +97,7 @@ public final class ResolvingDataSource implements DataSource {
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    checkNotNull(transferListener);
     upstreamDataSource.addTransferListener(transferListener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/upstream/StatsDataSource.java

@@ -72,6 +72,7 @@ public final class StatsDataSource implements DataSource {
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    Assertions.checkNotNull(transferListener);
     dataSource.addTransferListener(transferListener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/upstream/TeeDataSource.java

@@ -45,6 +45,7 @@ public final class TeeDataSource implements DataSource {
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    Assertions.checkNotNull(transferListener);
     upstream.addTransferListener(transferListener);
   }
 

library/core/src/main/java/com/google/android/exoplayer2/upstream/cache/CacheDataSource.java

@@ -541,6 +541,7 @@ public final class CacheDataSource implements DataSource {
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    Assertions.checkNotNull(transferListener);
     cacheReadDataSource.addTransferListener(transferListener);
     upstreamDataSource.addTransferListener(transferListener);
   }

library/core/src/main/java/com/google/android/exoplayer2/upstream/cache/SimpleCache.java

@@ -309,6 +309,8 @@ public final class SimpleCache implements Cache {
   @Override
   public synchronized NavigableSet<CacheSpan> addListener(String key, Listener listener) {
     Assertions.checkState(!released);
+    Assertions.checkNotNull(key);
+    Assertions.checkNotNull(listener);
     ArrayList<Listener> listenersForKey = listeners.get(key);
     if (listenersForKey == null) {
       listenersForKey = new ArrayList<>();

library/core/src/main/java/com/google/android/exoplayer2/upstream/crypto/AesCipherDataSource.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.upstream.crypto;
 
+import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Util.castNonNull;
 
 import android.net.Uri;
@@ -45,6 +46,7 @@ public final class AesCipherDataSource implements DataSource {
 
   @Override
   public void addTransferListener(TransferListener transferListener) {
+    checkNotNull(transferListener);
     upstream.addTransferListener(transferListener);
   }
 

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/Aes128DataSource.java

@@ -66,6 +66,7 @@ import javax.crypto.spec.SecretKeySpec;
 
   @Override
   public final void addTransferListener(TransferListener transferListener) {
+    Assertions.checkNotNull(transferListener);
     upstream.addTransferListener(transferListener);
   }
 

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/playlist/DefaultHlsPlaylistTracker.java

@@ -161,6 +161,7 @@ public final class DefaultHlsPlaylistTracker
 
   @Override
   public void addListener(PlaylistEventListener listener) {
+    Assertions.checkNotNull(listener);
     listeners.add(listener);
   }
 

library/ui/src/main/java/com/google/android/exoplayer2/ui/DefaultTimeBar.java

@@ -450,6 +450,7 @@ public class DefaultTimeBar extends View implements TimeBar {
 
   @Override
   public void addListener(OnScrubListener listener) {
+    Assertions.checkNotNull(listener);
     listeners.add(listener);
   }
 

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerControlView.java

@@ -586,6 +586,7 @@ public class PlayerControlView extends FrameLayout {
    * @param listener The listener to be notified about visibility changes.
    */
   public void addVisibilityListener(VisibilityListener listener) {
+    Assertions.checkNotNull(listener);
     visibilityListeners.add(listener);
   }
 

library/ui/src/main/java/com/google/android/exoplayer2/ui/StyledPlayerControlView.java

@@ -790,6 +790,7 @@ public class StyledPlayerControlView extends FrameLayout {
    * @param listener The listener to be notified about visibility changes.
    */
   public void addVisibilityListener(VisibilityListener listener) {
+    Assertions.checkNotNull(listener);
     visibilityListeners.add(listener);
   }