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LocalUserDataSource.java
/* * 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; import android.content.Context; import android.support.annotation.NonNull; import android.support.annotation.VisibleForTesting; /** * Concrete implementation of the {@link LocalUserDataSource} that works with Room. */ public class LocalUserDataSource implements UserDataSource { private static volatile LocalUserDataSource INSTANCE; private UserDao mUserDao; @VisibleForTesting LocalUserDataSource(UserDao userDao) { mUserDao = userDao; } public static LocalUserDataSource getInstance(@NonNull Context context) { if (INSTANCE == null) { synchronized (LocalUserDataSource.class) { if (INSTANCE == null) { UsersDatabase database = UsersDatabase.getInstance(context); INSTANCE = new LocalUserDataSource(database.userDao()); } } } return INSTANCE; } @Override public User getUser() { return mUserDao.getUser(); } @Override public void insertOrUpdateUser(User user) { mUserDao.insertUser(user); } @Override public void deleteAllUsers() { mUserDao.deleteAllUsers(); } }