content: /*
   * Copyright (C) 2014 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.android.server;
  
  import android.annotation.Nullable;
  
  import java.util.List;
  
  /**
   * Runtime bridge between the Backup Manager Service and the App Widget Service,
   * since those two modules are intentionally decoupled for modularity.
   *
   * @hide
   */
  public class AppWidgetBackupBridge {
      private static WidgetBackupProvider sAppWidgetService;
  
      public static void register(WidgetBackupProvider instance) {
          sAppWidgetService = instance;
      }
  
      public static List<String> getWidgetParticipants(int userId) {
          return (sAppWidgetService != null)
                  ? sAppWidgetService.getWidgetParticipants(userId)
                  : null;
      }
  
      /** Returns a byte array of widget data for the specified package or {@code null}. */
      @Nullable
      public static byte[] getWidgetState(String packageName, int userId) {
          return (sAppWidgetService != null)
                  ? sAppWidgetService.getWidgetState(packageName, userId)
                  : null;
      }
  
      public static void restoreStarting(int userId) {
          if (sAppWidgetService != null) {
              sAppWidgetService.restoreStarting(userId);
          }
      }
  
      public static void restoreWidgetState(String packageName, byte[] restoredState, int userId) {
          if (sAppWidgetService != null) {
              sAppWidgetService.restoreWidgetState(packageName, restoredState, userId);
          }
      }
  
      public static void restoreFinished(int userId) {
          if (sAppWidgetService != null) {
              sAppWidgetService.restoreFinished(userId);
          }
      }
  }
  