Remove TrackSelection.Factory from SelectionOverride

Issue: #3915

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=193045534

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

@@ -361,7 +361,7 @@ public class PlayerActivity extends Activity
           new DefaultRenderersFactory(this, extensionRendererMode);
 
       trackSelector = new DefaultTrackSelector(trackSelectionFactory);
-      trackSelectionHelper = new TrackSelectionHelper(trackSelector, trackSelectionFactory);
+      trackSelectionHelper = new TrackSelectionHelper(trackSelector);
       lastSeenTrackGroupArray = null;
 
       player =

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

@@ -32,7 +32,6 @@ import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector.SelectionOverride;
 import com.google.android.exoplayer2.trackselection.MappingTrackSelector.MappedTrackInfo;
-import com.google.android.exoplayer2.trackselection.TrackSelection;
 import java.util.Arrays;
 
 /**
@@ -42,7 +41,6 @@ import java.util.Arrays;
     DialogInterface.OnClickListener {
 
   private final DefaultTrackSelector selector;
-  private final TrackSelection.Factory trackSelectionFactory;
 
   private MappedTrackInfo trackInfo;
   private int rendererIndex;
@@ -55,14 +53,9 @@ import java.util.Arrays;
   private CheckedTextView defaultView;
   private CheckedTextView[][] trackViews;
 
-  /**
+  /** @param selector The track selector. */
-   * @param selector The track selector.
+  public TrackSelectionHelper(DefaultTrackSelector selector) {
-   * @param trackSelectionFactory A factory for overriding {@link TrackSelection}s.
-   */
-  public TrackSelectionHelper(
-      DefaultTrackSelector selector, TrackSelection.Factory trackSelectionFactory) {
     this.selector = selector;
-    this.trackSelectionFactory = trackSelectionFactory;
   }
 
   /**
@@ -228,7 +221,7 @@ import java.util.Arrays;
   }
 
   private void setOverride(int group, int... tracks) {
-    override = new SelectionOverride(trackSelectionFactory, group, tracks);
+    override = new SelectionOverride(group, tracks);
   }
 
   // Track array manipulation.

library/core/src/main/java/com/google/android/exoplayer2/trackselection/DefaultTrackSelector.java

@@ -632,33 +632,20 @@ public class DefaultTrackSelector extends MappingTrackSelector {
   /** A track selection override. */
   public static class SelectionOverride {
 
-    public final TrackSelection.Factory factory;
     public final int groupIndex;
     public final int[] tracks;
     public final int length;
 
     /**
-     * @param factory A factory for creating selections from this override.
      * @param groupIndex The overriding track group index.
      * @param tracks The overriding track indices within the track group.
      */
-    public SelectionOverride(TrackSelection.Factory factory, int groupIndex, int... tracks) {
+    public SelectionOverride(int groupIndex, int... tracks) {
-      this.factory = factory;
       this.groupIndex = groupIndex;
       this.tracks = tracks;
       this.length = tracks.length;
     }
 
-    /**
-     * Creates an selection from this override.
-     *
-     * @param groups The track groups whose selection is being overridden.
-     * @return The selection.
-     */
-    public TrackSelection createTrackSelection(TrackGroupArray groups) {
-      return factory.createTrackSelection(groups.get(groupIndex), tracks);
-    }
-
     /** Returns whether this override contains the specified track index. */
     public boolean containsTrack(int track) {
       for (int overrideTrack : tracks) {
@@ -905,8 +892,17 @@ public class DefaultTrackSelector extends MappingTrackSelector {
         TrackGroupArray rendererTrackGroup = mappedTrackInfo.getTrackGroups(i);
         if (hasSelectionOverride(i, rendererTrackGroup)) {
           SelectionOverride override = selectionOverrides.get(i).get(rendererTrackGroup);
-          rendererTrackSelections[i] =
+          if (override == null) {
-              override == null ? null : override.createTrackSelection(rendererTrackGroup);
+            rendererTrackSelections[i] = null;
+          } else if (override.length == 1) {
+            rendererTrackSelections[i] =
+                new FixedTrackSelection(
+                    rendererTrackGroup.get(override.groupIndex), override.tracks[0]);
+          } else {
+            rendererTrackSelections[i] =
+                adaptiveTrackSelectionFactory.createTrackSelection(
+                    rendererTrackGroup.get(override.groupIndex), override.tracks);
+          }
         }
       }
     }

library/core/src/main/java/com/google/android/exoplayer2/trackselection/MappingTrackSelector.java

@@ -264,17 +264,6 @@ public abstract class MappingTrackSelector extends TrackSelector {
 
   }
 
-  // TODO: Make DefaultTrackSelector.SelectionOverride final when this is removed.
-  /** @deprecated Use {@link DefaultTrackSelector.SelectionOverride} */
-  @Deprecated
-  public static final class SelectionOverride extends DefaultTrackSelector.SelectionOverride {
-
-    public SelectionOverride(TrackSelection.Factory factory, int groupIndex, int... tracks) {
-      super(factory, groupIndex, tracks);
-    }
-
-  }
-
   private MappedTrackInfo currentMappedTrackInfo;
 
   /**