content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.google.android.exoplayer2.source.chunk;
  
  import android.util.Log;
  import com.google.android.exoplayer2.trackselection.TrackSelection;
  import com.google.android.exoplayer2.upstream.HttpDataSource.InvalidResponseCodeException;
  
  /**
   * Helper class for blacklisting tracks in a {@link TrackSelection} when 404 (Not Found) and 410
   * (Gone) HTTP response codes are encountered.
   */
  public final class ChunkedTrackBlacklistUtil {
  
    /**
     * The default duration for which a track is blacklisted in milliseconds.
     */
    public static final long DEFAULT_TRACK_BLACKLIST_MS = 60000;
  
    private static final String TAG = "ChunkedTrackBlacklist";
  
    /**
     * Blacklists {@code trackSelectionIndex} in {@code trackSelection} for
     * {@link #DEFAULT_TRACK_BLACKLIST_MS} if {@code e} is an {@link InvalidResponseCodeException}
     * with {@link InvalidResponseCodeException#responseCode} equal to 404 or 410. Else does nothing.
     * Note that blacklisting will fail if the track is the only non-blacklisted track in the
     * selection.
     *
     * @param trackSelection The track selection.
     * @param trackSelectionIndex The index in the selection to consider blacklisting.
     * @param e The error to inspect.
     * @return Whether the track was blacklisted in the selection.
     */
    public static boolean maybeBlacklistTrack(TrackSelection trackSelection, int trackSelectionIndex,
        Exception e) {
      return maybeBlacklistTrack(trackSelection, trackSelectionIndex, e, DEFAULT_TRACK_BLACKLIST_MS);
    }
  
    /**
     * Blacklists {@code trackSelectionIndex} in {@code trackSelection} for
     * {@code blacklistDurationMs} if calling {@link #shouldBlacklist(Exception)} for {@code e}
     * returns true. Else does nothing. Note that blacklisting will fail if the track is the only
     * non-blacklisted track in the selection.
     *
     * @param trackSelection The track selection.
     * @param trackSelectionIndex The index in the selection to consider blacklisting.
     * @param e The error to inspect.
     * @param blacklistDurationMs The duration to blacklist the track for, if it is blacklisted.
     * @return Whether the track was blacklisted.
     */
    public static boolean maybeBlacklistTrack(TrackSelection trackSelection, int trackSelectionIndex,
        Exception e, long blacklistDurationMs) {
      if (shouldBlacklist(e)) {
        boolean blacklisted = trackSelection.blacklist(trackSelectionIndex, blacklistDurationMs);
        int responseCode = ((InvalidResponseCodeException) e).responseCode;
        if (blacklisted) {
          Log.w(TAG, "Blacklisted: duration=" + blacklistDurationMs + ", responseCode="
              + responseCode + ", format=" + trackSelection.getFormat(trackSelectionIndex));
        } else {
          Log.w(TAG, "Blacklisting failed (cannot blacklist last enabled track): responseCode="
              + responseCode + ", format=" + trackSelection.getFormat(trackSelectionIndex));
        }
        return blacklisted;
      }
      return false;
    }
  
    /**
     * Returns whether a loading error is an {@link InvalidResponseCodeException} with
     * {@link InvalidResponseCodeException#responseCode} equal to 404 or 410.
     *
     * @param e The loading error.
     * @return Wheter the loading error is an {@link InvalidResponseCodeException} with
     *     {@link InvalidResponseCodeException#responseCode} equal to 404 or 410.
     */
    public static boolean shouldBlacklist(Exception e) {
      if (e instanceof InvalidResponseCodeException) {
        int responseCode = ((InvalidResponseCodeException) e).responseCode;
        return responseCode == 404 || responseCode == 410;
      }
      return false;
    }
  
    private ChunkedTrackBlacklistUtil() {}
  
  }
  