Remove more classes from nullness blacklist

PiperOrigin-RevId: 249431027

library/core/src/main/java/com/google/android/exoplayer2/scheduler/Requirements.java

@@ -27,6 +27,7 @@ import android.os.Parcel;
 import android.os.Parcelable;
 import android.os.PowerManager;
 import androidx.annotation.IntDef;
+import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.util.Util;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
@@ -179,7 +180,7 @@ public final class Requirements implements Parcelable {
   }
 
   @Override
-  public boolean equals(Object o) {
+  public boolean equals(@Nullable Object o) {
     if (this == o) {
       return true;
     }

library/core/src/main/java/com/google/android/exoplayer2/scheduler/RequirementsWatcher.java

@@ -27,7 +27,9 @@ import android.net.NetworkRequest;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.PowerManager;
+import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
+import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
 
 /**
@@ -57,10 +59,10 @@ public final class RequirementsWatcher {
   private final Requirements requirements;
   private final Handler handler;
 
-  private DeviceStatusChangeReceiver receiver;
+  @Nullable private DeviceStatusChangeReceiver receiver;
 
   @Requirements.RequirementFlags private int notMetRequirements;
-  private CapabilityValidatedCallback networkCallback;
+  @Nullable private CapabilityValidatedCallback networkCallback;
 
   /**
    * @param context Any context.
@@ -111,7 +113,7 @@ public final class RequirementsWatcher {
 
   /** Stops watching for changes. */
   public void stop() {
-    context.unregisterReceiver(receiver);
+    context.unregisterReceiver(Assertions.checkNotNull(receiver));
     receiver = null;
     if (networkCallback != null) {
       unregisterNetworkCallback();
@@ -139,7 +141,7 @@ public final class RequirementsWatcher {
     if (Util.SDK_INT >= 21) {
       ConnectivityManager connectivityManager =
           (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
-      connectivityManager.unregisterNetworkCallback(networkCallback);
+      connectivityManager.unregisterNetworkCallback(Assertions.checkNotNull(networkCallback));
       networkCallback = null;
     }
   }

library/core/src/main/java/com/google/android/exoplayer2/text/CaptionStyleCompat.java

@@ -19,6 +19,7 @@ import android.annotation.TargetApi;
 import android.graphics.Color;
 import android.graphics.Typeface;
 import androidx.annotation.IntDef;
+import androidx.annotation.Nullable;
 import android.view.accessibility.CaptioningManager;
 import android.view.accessibility.CaptioningManager.CaptionStyle;
 import com.google.android.exoplayer2.util.Util;
@@ -72,11 +73,15 @@ public final class CaptionStyleCompat {
    */
   public static final int USE_TRACK_COLOR_SETTINGS = 1;
 
-  /**
-   * Default caption style.
-   */
-  public static final CaptionStyleCompat DEFAULT = new CaptionStyleCompat(
-      Color.WHITE, Color.BLACK, Color.TRANSPARENT, EDGE_TYPE_NONE, Color.WHITE, null);
+  /** Default caption style. */
+  public static final CaptionStyleCompat DEFAULT =
+      new CaptionStyleCompat(
+          Color.WHITE,
+          Color.BLACK,
+          Color.TRANSPARENT,
+          EDGE_TYPE_NONE,
+          Color.WHITE,
+          /* typeface= */ null);
 
   /**
    * The preferred foreground color.
@@ -110,10 +115,8 @@ public final class CaptionStyleCompat {
    */
   public final int edgeColor;
 
-  /**
-   * The preferred typeface.
-   */
-  public final Typeface typeface;
+  /** The preferred typeface, or {@code null} if unspecified. */
+  @Nullable public final Typeface typeface;
 
   /**
    * Creates a {@link CaptionStyleCompat} equivalent to a provided {@link CaptionStyle}.
@@ -141,8 +144,13 @@ public final class CaptionStyleCompat {
    * @param edgeColor See {@link #edgeColor}.
    * @param typeface See {@link #typeface}.
    */
-  public CaptionStyleCompat(int foregroundColor, int backgroundColor, int windowColor,
-      @EdgeType int edgeType, int edgeColor, Typeface typeface) {
+  public CaptionStyleCompat(
+      int foregroundColor,
+      int backgroundColor,
+      int windowColor,
+      @EdgeType int edgeType,
+      int edgeColor,
+      @Nullable Typeface typeface) {
     this.foregroundColor = foregroundColor;
     this.backgroundColor = backgroundColor;
     this.windowColor = windowColor;

library/core/src/main/java/com/google/android/exoplayer2/text/Cue.java

@@ -18,6 +18,7 @@ package com.google.android.exoplayer2.text;
 import android.graphics.Bitmap;
 import android.graphics.Color;
 import androidx.annotation.IntDef;
+import androidx.annotation.Nullable;
 import android.text.Layout.Alignment;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
@@ -111,17 +112,13 @@ public class Cue {
    * The cue text, or null if this is an image cue. Note the {@link CharSequence} may be decorated
    * with styling spans.
    */
-  public final CharSequence text;
+  @Nullable public final CharSequence text;
 
-  /**
-   * The alignment of the cue text within the cue box, or null if the alignment is undefined.
-   */
-  public final Alignment textAlignment;
+  /** The alignment of the cue text within the cue box, or null if the alignment is undefined. */
+  @Nullable public final Alignment textAlignment;
 
-  /**
-   * The cue image, or null if this is a text cue.
-   */
-  public final Bitmap bitmap;
+  /** The cue image, or null if this is a text cue. */
+  @Nullable public final Bitmap bitmap;
 
   /**
    * The position of the {@link #lineAnchor} of the cue box within the viewport in the direction
@@ -298,7 +295,7 @@ public class Cue {
    */
   public Cue(
       CharSequence text,
-      Alignment textAlignment,
+      @Nullable Alignment textAlignment,
       float line,
       @LineType int lineType,
       @AnchorType int lineAnchor,
@@ -376,7 +373,7 @@ public class Cue {
    */
   public Cue(
       CharSequence text,
-      Alignment textAlignment,
+      @Nullable Alignment textAlignment,
       float line,
       @LineType int lineType,
       @AnchorType int lineAnchor,
@@ -403,9 +400,9 @@ public class Cue {
   }
 
   private Cue(
-      CharSequence text,
-      Alignment textAlignment,
-      Bitmap bitmap,
+      @Nullable CharSequence text,
+      @Nullable Alignment textAlignment,
+      @Nullable Bitmap bitmap,
       float line,
       @LineType int lineType,
       @AnchorType int lineAnchor,

library/core/src/main/java/com/google/android/exoplayer2/text/SubtitleOutputBuffer.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.text;
 
+import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.decoder.OutputBuffer;
 import java.util.List;
@@ -24,7 +25,7 @@ import java.util.List;
  */
 public abstract class SubtitleOutputBuffer extends OutputBuffer implements Subtitle {
 
-  private Subtitle subtitle;
+  @Nullable private Subtitle subtitle;
   private long subsampleOffsetUs;
 
   /**

library/core/src/main/java/com/google/android/exoplayer2/text/webvtt/CssParser.java

@@ -15,11 +15,11 @@
  */
 package com.google.android.exoplayer2.text.webvtt;
 
+import androidx.annotation.Nullable;
 import android.text.TextUtils;
 import com.google.android.exoplayer2.util.ColorParser;
 import com.google.android.exoplayer2.util.ParsableByteArray;
 import com.google.android.exoplayer2.util.Util;
-import java.util.Arrays;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -52,13 +52,15 @@ import java.util.regex.Pattern;
   }
 
   /**
-   * Takes a CSS style block and consumes up to the first empty line found. Attempts to parse the
-   * contents of the style block and returns a {@link WebvttCssStyle} instance if successful, or
-   * {@code null} otherwise.
+   * Takes a CSS style block and consumes up to the first empty line. Attempts to parse the contents
+   * of the style block and returns a {@link WebvttCssStyle} instance if successful, or {@code null}
+   * otherwise.
    *
    * @param input The input from which the style block should be read.
-   * @return A {@link WebvttCssStyle} that represents the parsed block.
+   * @return A {@link WebvttCssStyle} that represents the parsed block, or {@code null} if parsing
+   *     failed.
    */
+  @Nullable
   public WebvttCssStyle parseBlock(ParsableByteArray input) {
     stringBuilder.setLength(0);
     int initialInputPosition = input.getPosition();
@@ -86,13 +88,14 @@ import java.util.regex.Pattern;
   }
 
   /**
-   * Returns a string containing the selector. The input is expected to have the form
-   * {@code ::cue(tag#id.class1.class2[voice="someone"]}, where every element is optional.
+   * Returns a string containing the selector. The input is expected to have the form {@code
+   * ::cue(tag#id.class1.class2[voice="someone"]}, where every element is optional.
    *
    * @param input From which the selector is obtained.
-   * @return A string containing the target, empty string if the selector is universal
-   *     (targets all cues) or null if an error was encountered.
+   * @return A string containing the target, empty string if the selector is universal (targets all
+   *     cues) or null if an error was encountered.
    */
+  @Nullable
   private static String parseSelector(ParsableByteArray input, StringBuilder stringBuilder) {
     skipWhitespaceAndComments(input);
     if (input.bytesLeft() < 5) {
@@ -116,7 +119,7 @@ import java.util.regex.Pattern;
       target = readCueTarget(input);
     }
     token = parseNextToken(input, stringBuilder);
-    if (!")".equals(token) || token == null) {
+    if (!")".equals(token)) {
       return null;
     }
     return target;
@@ -196,6 +199,7 @@ import java.util.regex.Pattern;
   }
 
   // Visible for testing.
+  @Nullable
   /* package */ static String parseNextToken(ParsableByteArray input, StringBuilder stringBuilder) {
     skipWhitespaceAndComments(input);
     if (input.bytesLeft() == 0) {
@@ -237,6 +241,7 @@ import java.util.regex.Pattern;
     return (char) input.data[position];
   }
 
+  @Nullable
   private static String parsePropertyValue(ParsableByteArray input, StringBuilder stringBuilder) {
     StringBuilder expressionBuilder = new StringBuilder();
     String token;
@@ -325,7 +330,7 @@ import java.util.regex.Pattern;
       style.setTargetTagName(tagAndIdDivision);
     }
     if (classDivision.length > 1) {
-      style.setTargetClasses(Arrays.copyOfRange(classDivision, 1, classDivision.length));
+      style.setTargetClasses(Util.nullSafeArrayCopyOfRange(classDivision, 1, classDivision.length));
     }
   }
 

library/core/src/main/java/com/google/android/exoplayer2/util/Util.java

@@ -315,6 +315,21 @@ public final class Util {
     return Arrays.copyOf(input, length);
   }
 
+  /**
+   * Copies a subset of an array.
+   *
+   * @param input The input array.
+   * @param from The start the range to be copied, inclusive
+   * @param to The end of the range to be copied, exclusive.
+   * @return The copied array.
+   */
+  @SuppressWarnings({"nullness:argument.type.incompatible", "nullness:return.type.incompatible"})
+  public static <T> T[] nullSafeArrayCopyOfRange(T[] input, int from, int to) {
+    Assertions.checkArgument(0 <= from);
+    Assertions.checkArgument(to <= input.length);
+    return Arrays.copyOfRange(input, from, to);
+  }
+
   /**
    * Concatenates two non-null type arrays.
    *