1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 package ohos.devtools.views.user; 17 18 import model.AbstractSdk; 19 20 import java.util.Optional; 21 22 /** 23 * Sdk Manager 24 * 25 * @since 2021/11/22 26 */ 27 public class UserManager { 28 private static volatile UserManager userManager; 29 UserManager()30 private UserManager() { 31 } 32 33 /** 34 * Get an instance 35 * 36 * @return UserDataDao 37 */ getInstance()38 public static UserManager getInstance() { 39 if (userManager == null) { 40 synchronized (UserManager.class) { 41 if (userManager == null) { 42 userManager = new UserManager(); 43 } 44 } 45 } 46 return userManager; 47 } 48 49 /** 50 * getSdkImpl 51 * 52 * @return Optional<AbstractSdk> 53 */ getSdkImpl()54 public Optional<AbstractSdk> getSdkImpl() { 55 return Optional.ofNullable(null); 56 } 57 } 58