1 /*
2  * Copyright (C) 2020 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 com.android.settings.network.telephony;
18 
19 import android.util.Log;
20 
21 import com.android.settings.core.BasePreferenceController;
22 import com.android.settingslib.core.AbstractPreferenceController;
23 import com.android.settingslib.utils.ThreadUtils;
24 
25 import java.util.ArrayList;
26 import java.util.Collection;
27 import java.util.concurrent.ExecutionException;
28 import java.util.concurrent.Future;
29 
30 /**
31  * Session for controlling the status of TelephonyPreferenceController(s).
32  *
33  * Within this session, result of {@link BasePreferenceController#availabilityStatus()}
34  * would be under control.
35  */
36 public class TelephonyStatusControlSession implements AutoCloseable {
37 
38     private static final String LOG_TAG = "TelephonyStatusControlSS";
39 
40     private Collection<AbstractPreferenceController> mControllers;
41     private Collection<Future<Boolean>> mResult = new ArrayList<>();
42 
43     /**
44      * Buider of session
45      */
46     public static class Builder {
47         private Collection<AbstractPreferenceController> mControllers;
48 
49         /**
50          * Constructor
51          *
52          * @param controllers is a collection of {@link AbstractPreferenceController}
53          *        which would have {@link BasePreferenceController#availabilityStatus()}
54          *        under control within this session.
55          */
Builder(Collection<AbstractPreferenceController> controllers)56         public Builder(Collection<AbstractPreferenceController> controllers) {
57             mControllers = controllers;
58         }
59 
60         /**
61          * Method to build this session.
62          * @return {@link TelephonyStatusControlSession} session been setup.
63          */
build()64         public TelephonyStatusControlSession build() {
65             return new TelephonyStatusControlSession(mControllers);
66         }
67     }
68 
TelephonyStatusControlSession(Collection<AbstractPreferenceController> controllers)69     private TelephonyStatusControlSession(Collection<AbstractPreferenceController> controllers) {
70         mControllers = controllers;
71         controllers.forEach(prefCtrl -> mResult
72                 .add(ThreadUtils.postOnBackgroundThread(() -> setupAvailabilityStatus(prefCtrl))));
73 
74     }
75 
76     /**
77      * Close the session.
78      *
79      * No longer control the status.
80      */
close()81     public void close() {
82         //check the background thread is finished then unset the status of availability.
83 
84         for (Future<Boolean> result : mResult) {
85             try {
86                 result.get();
87             } catch (ExecutionException | InterruptedException exception) {
88                 Log.e(LOG_TAG, "setup availability status failed!", exception);
89             }
90         }
91         unsetAvailabilityStatus(mControllers);
92     }
93 
setupAvailabilityStatus(AbstractPreferenceController controller)94     private Boolean setupAvailabilityStatus(AbstractPreferenceController controller) {
95         try {
96             if (controller instanceof TelephonyAvailabilityHandler) {
97                 int status = ((BasePreferenceController) controller)
98                         .getAvailabilityStatus();
99                 ((TelephonyAvailabilityHandler) controller).setAvailabilityStatus(status);
100             }
101             return true;
102         } catch (Exception exception) {
103             Log.e(LOG_TAG, "Setup availability status failed!", exception);
104             return false;
105         }
106     }
107 
unsetAvailabilityStatus( Collection<AbstractPreferenceController> controllerLists)108     private void unsetAvailabilityStatus(
109             Collection<AbstractPreferenceController> controllerLists) {
110         controllerLists.stream()
111                 .filter(controller -> controller instanceof TelephonyAvailabilityHandler)
112                 .map(TelephonyAvailabilityHandler.class::cast)
113                 .forEach(controller -> {
114                     controller.unsetAvailabilityStatus();
115                 });
116     }
117 }
118