content: /*
   * Copyright (C) 2017 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 androidx.leanback.leanbackshowcase.app.room.network;
  
  import android.app.DownloadManager;
  
  import androidx.lifecycle.LifecycleObserver;
  
  import android.content.BroadcastReceiver;
  import android.content.Context;
  import android.content.Intent;
  import android.database.Cursor;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class DownloadCompleteBroadcastReceiver extends BroadcastReceiver
          implements LifecycleObserver{
  
      // singleton design pattern
      private static DownloadCompleteBroadcastReceiver sReceiver;
  
      private List<DownloadCompleteListener> downloadingCompletionListener;
  
      public interface DownloadCompleteListener {
          void onDownloadingCompleted(DownloadingTaskDescription desc);
      }
  
      public void registerListener(DownloadCompleteListener listener) {
          downloadingCompletionListener.add(listener);
      }
  
      @Override
      public void onReceive(Context context, Intent intent) {
          final DownloadManager dm = (DownloadManager) context.getSystemService(
                  Context.DOWNLOAD_SERVICE);
          Long downloadingTaskId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1L);
          if (NetworkManagerUtil.downloadingTaskQueue.containsKey(downloadingTaskId)) {
              DownloadManager.Query query = new DownloadManager.Query();
              query.setFilterById(downloadingTaskId);
              Cursor cursor = dm.query(query);
  
              // retrieve downloaded content's information through download manager.
              if (!cursor.moveToFirst()) {
                  return;
              }
  
              if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))
                      != DownloadManager.STATUS_SUCCESSFUL) {
                  return;
              }
  
              String path = cursor.getString(
                      cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
  
              final DownloadingTaskDescription desc =
                      NetworkManagerUtil.downloadingTaskQueue.get(downloadingTaskId);
  
              // update local storage path
              desc.setStoragePath(path);
  
              for (final DownloadCompleteListener listener: downloadingCompletionListener) {
                          listener.onDownloadingCompleted(desc);
              }
          }
      }
  
      public static DownloadCompleteBroadcastReceiver getInstance() {
          if (sReceiver == null) {
              sReceiver = new DownloadCompleteBroadcastReceiver();
          }
          return sReceiver;
      }
  
      private DownloadCompleteBroadcastReceiver() {
          downloadingCompletionListener = new ArrayList<>();
      }
  }
  