gt:         if (holder instanceof PlayQueueItemHolder) {
context: package org.schabi.newpipe.player.playqueue;
  
  import android.content.Context;
  import android.util.Log;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  import androidx.annotation.NonNull;
  import androidx.recyclerview.widget.RecyclerView;
  
  import org.schabi.newpipe.R;
  import org.schabi.newpipe.player.playqueue.events.AppendEvent;
  import org.schabi.newpipe.player.playqueue.events.ErrorEvent;
  import org.schabi.newpipe.player.playqueue.events.MoveEvent;
  import org.schabi.newpipe.player.playqueue.events.PlayQueueEvent;
  import org.schabi.newpipe.player.playqueue.events.RemoveEvent;
  import org.schabi.newpipe.player.playqueue.events.SelectEvent;
  import org.schabi.newpipe.util.FallbackViewHolder;
  
  import java.util.List;
  
  import io.reactivex.rxjava3.core.Observer;
  import io.reactivex.rxjava3.disposables.Disposable;
  
  /**
   * Created by Christian Schabesberger on 01.08.16.
   * <p>
   * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
   * InfoListAdapter.java is part of NewPipe.
   * </p>
   * <p>
   * NewPipe is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   * </p>
   * <p>
   * NewPipe is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * </p>
   * <p>
   * You should have received a copy of the GNU General Public License
   * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
   * </p>
   */
  
  public class PlayQueueAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
      private static final String TAG = PlayQueueAdapter.class.toString();
  
      private static final int ITEM_VIEW_TYPE_ID = 0;
      private static final int FOOTER_VIEW_TYPE_ID = 1;
  
      private final PlayQueueItemBuilder playQueueItemBuilder;
      private final PlayQueue playQueue;
      private boolean showFooter = false;
      private View footer = null;
  
      private Disposable playQueueReactor;
  
      public PlayQueueAdapter(final Context context, final PlayQueue playQueue) {
          if (playQueue.getBroadcastReceiver() == null) {
              throw new IllegalStateException("Play Queue has not been initialized.");
          }
  
          this.playQueueItemBuilder = new PlayQueueItemBuilder(context);
          this.playQueue = playQueue;
  
          playQueue.getBroadcastReceiver().toObservable().subscribe(getReactor());
      }
  
      private Observer<PlayQueueEvent> getReactor() {
          return new Observer<PlayQueueEvent>() {
              @Override
              public void onSubscribe(@NonNull final Disposable d) {
                  if (playQueueReactor != null) {
                      playQueueReactor.dispose();
                  }
                  playQueueReactor = d;
              }
  
              @Override
              public void onNext(@NonNull final PlayQueueEvent playQueueMessage) {
                  if (playQueueReactor != null) {
                      onPlayQueueChanged(playQueueMessage);
                  }
              }
  
              @Override
              public void onError(@NonNull final Throwable e) { }
  
              @Override
              public void onComplete() {
                  dispose();
              }
          };
  
      }
  
      private void onPlayQueueChanged(final PlayQueueEvent message) {
          switch (message.type()) {
              case RECOVERY:
                  // Do nothing.
                  break;
              case SELECT:
                  final SelectEvent selectEvent = (SelectEvent) message;
                  notifyItemChanged(selectEvent.getOldIndex());
                  notifyItemChanged(selectEvent.getNewIndex());
                  break;
              case APPEND:
                  final AppendEvent appendEvent = (AppendEvent) message;
                  notifyItemRangeInserted(playQueue.size(), appendEvent.getAmount());
                  break;
              case ERROR:
                  final ErrorEvent errorEvent = (ErrorEvent) message;
                  notifyItemChanged(errorEvent.getErrorIndex());
                  notifyItemChanged(errorEvent.getQueueIndex());
                  break;
              case REMOVE:
                  final RemoveEvent removeEvent = (RemoveEvent) message;
                  notifyItemRemoved(removeEvent.getRemoveIndex());
                  notifyItemChanged(removeEvent.getQueueIndex());
                  break;
              case MOVE:
                  final MoveEvent moveEvent = (MoveEvent) message;
                  notifyItemMoved(moveEvent.getFromIndex(), moveEvent.getToIndex());
                  break;
              case INIT:
              case REORDER:
              default:
                  notifyDataSetChanged();
                  break;
          }
      }
  
      public void dispose() {
          if (playQueueReactor != null) {
              playQueueReactor.dispose();
          }
          playQueueReactor = null;
      }
  
      public void setSelectedListener(final PlayQueueItemBuilder.OnSelectedListener listener) {
          playQueueItemBuilder.setOnSelectedListener(listener);
      }
  
      public void unsetSelectedListener() {
          playQueueItemBuilder.setOnSelectedListener(null);
      }
  
      public void setFooter(final View footer) {
          this.footer = footer;
          notifyItemChanged(playQueue.size());
      }
  
      public void showFooter(final boolean show) {
          showFooter = show;
          notifyItemChanged(playQueue.size());
      }
  
      public List<PlayQueueItem> getItems() {
          return playQueue.getStreams();
      }
  
      @Override
      public int getItemCount() {
          int count = playQueue.getStreams().size();
          if (footer != null && showFooter) {
              count++;
          }
          return count;
      }
  
      @Override
      public int getItemViewType(final int position) {
          if (footer != null && position == playQueue.getStreams().size() && showFooter) {
              return FOOTER_VIEW_TYPE_ID;
          }
  
          return ITEM_VIEW_TYPE_ID;
      }
  
      @Override
      public RecyclerView.ViewHolder onCreateViewHolder(final ViewGroup parent, final int type) {
          switch (type) {
              case FOOTER_VIEW_TYPE_ID:
                  return new HFHolder(footer);
              case ITEM_VIEW_TYPE_ID:
                  return new PlayQueueItemHolder(LayoutInflater.from(parent.getContext())
                          .inflate(R.layout.play_queue_item, parent, false));
              default:
                  Log.e(TAG, "Attempting to create view holder with undefined type: " + type);
                  return new FallbackViewHolder(new View(parent.getContext()));
          }
      }
  
      @Override
      public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
  