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 com.example.android.persistence.migrations;
  
  /**
   * Access point for accessing user data.
   */
  public interface UserDataSource {
  
      /**
       * Gets all the users from the data source.
       *
       * @return all the users from the data source.
       */
      User getUser();
  
      /**
       * Inserts the user in the data source, or, if this is an existing user, it updates it.
       *
       * @param user the user to be inserted or updated.
       */
      void insertOrUpdateUser(User user);
  
      /**
       * Deletes all users from the data source.
       */
      void deleteAllUsers();
  }
  