1 /*
2  * Copyright (C) 2024 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.app.appsearch;
18 
19 import android.annotation.NonNull;
20 
21 import com.android.internal.annotations.VisibleForTesting;
22 
23 /**
24  * This is a factory class for implementations needed based on environment for framework code.
25  *
26  * @hide
27  */
28 public class AppSearchEnvironmentFactory {
29     private static volatile AppSearchEnvironment mEnvironmentInstance;
30 
31     /** Returns the singleton instance of {@link AppSearchEnvironment}. */
32     @NonNull
getEnvironmentInstance()33     public static AppSearchEnvironment getEnvironmentInstance() {
34         AppSearchEnvironment localRef = mEnvironmentInstance;
35         if (localRef == null) {
36             synchronized (AppSearchEnvironmentFactory.class) {
37                 localRef = mEnvironmentInstance;
38                 if (localRef == null) {
39                     mEnvironmentInstance = localRef = new FrameworkAppSearchEnvironment();
40                 }
41             }
42         }
43         return localRef;
44     }
45 
46     /** Sets an instance of {@link AppSearchEnvironment}. for testing. */
47     @VisibleForTesting
setEnvironmentInstanceForTest( @onNull AppSearchEnvironment appSearchEnvironment)48     public static void setEnvironmentInstanceForTest(
49             @NonNull AppSearchEnvironment appSearchEnvironment) {
50         synchronized (AppSearchEnvironmentFactory.class) {
51             mEnvironmentInstance = appSearchEnvironment;
52         }
53     }
54 
AppSearchEnvironmentFactory()55     private AppSearchEnvironmentFactory() {}
56 }
57