1 /*
2  * Copyright (C) 2019 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 package android.app.admin;
17 
18 import com.android.server.LocalServices;
19 
20 /**
21  * Stores a copy of the set of device state maintained by {@link DevicePolicyManager} which
22  * is not directly related to admin policies. This lives in its own class so that the state
23  * can be accessed from any place without risking dead locks.
24  *
25  * @hide
26  */
27 public abstract class DeviceStateCache {
DeviceStateCache()28     protected DeviceStateCache() {
29     }
30 
31     /**
32      * @return the instance.
33      */
getInstance()34     public static DeviceStateCache getInstance() {
35         final DevicePolicyManagerInternal dpmi =
36                 LocalServices.getService(DevicePolicyManagerInternal.class);
37         return (dpmi != null) ? dpmi.getDeviceStateCache() : EmptyDeviceStateCache.INSTANCE;
38     }
39 
40     /**
41      * See {@link DevicePolicyManager#isDeviceProvisioned}
42      */
isDeviceProvisioned()43     public abstract boolean isDeviceProvisioned();
44 
45     /**
46      * Empty implementation.
47      */
48     private static class EmptyDeviceStateCache extends DeviceStateCache {
49         private static final EmptyDeviceStateCache INSTANCE = new EmptyDeviceStateCache();
50 
51         @Override
isDeviceProvisioned()52         public boolean isDeviceProvisioned() {
53             return false;
54         }
55     }
56 }
57