1 /*
2  * Copyright (C) 2014 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.systemui.qs;
18 
19 import android.app.ActivityManager;
20 import android.database.ContentObserver;
21 import android.os.Handler;
22 
23 import com.android.systemui.statusbar.policy.Listenable;
24 import com.android.systemui.util.settings.SecureSettings;
25 
26 /** Helper for managing a secure setting. **/
27 public abstract class SecureSetting extends ContentObserver implements Listenable {
28     private final SecureSettings mSecureSettings;
29     private final String mSettingName;
30     private final int mDefaultValue;
31 
32     private boolean mListening;
33     private int mUserId;
34     private int mObservedValue;
35 
handleValueChanged(int value, boolean observedChange)36     protected abstract void handleValueChanged(int value, boolean observedChange);
37 
SecureSetting(SecureSettings secureSettings, Handler handler, String settingName, int userId)38     public SecureSetting(SecureSettings secureSettings, Handler handler, String settingName,
39             int userId) {
40         this(secureSettings, handler, settingName, userId, 0);
41     }
42 
SecureSetting(SecureSettings secureSetting, Handler handler, String settingName)43     public SecureSetting(SecureSettings secureSetting, Handler handler, String settingName) {
44         this(secureSetting, handler, settingName, ActivityManager.getCurrentUser());
45     }
46 
SecureSetting(SecureSettings secureSettings, Handler handler, String settingName, int userId, int defaultValue)47     public SecureSetting(SecureSettings secureSettings, Handler handler, String settingName,
48             int userId, int defaultValue) {
49         super(handler);
50         mSecureSettings = secureSettings;
51         mSettingName = settingName;
52         mObservedValue = mDefaultValue = defaultValue;
53         mUserId = userId;
54     }
55 
getValue()56     public int getValue() {
57         return mListening ? mObservedValue : getValueFromProvider();
58     }
59 
setValue(int value)60     public void setValue(int value) {
61         mSecureSettings.putIntForUser(mSettingName, value, mUserId);
62     }
63 
getValueFromProvider()64     private int getValueFromProvider() {
65         return mSecureSettings.getIntForUser(mSettingName, mDefaultValue, mUserId);
66     }
67 
68     @Override
setListening(boolean listening)69     public void setListening(boolean listening) {
70         if (listening == mListening) return;
71         mListening = listening;
72         if (listening) {
73             mObservedValue = getValueFromProvider();
74             mSecureSettings.registerContentObserverForUser(
75                     mSecureSettings.getUriFor(mSettingName), false, this, mUserId);
76         } else {
77             mSecureSettings.unregisterContentObserver(this);
78             mObservedValue = mDefaultValue;
79         }
80     }
81 
82     @Override
onChange(boolean selfChange)83     public void onChange(boolean selfChange) {
84         final int value = getValueFromProvider();
85         final boolean changed = value != mObservedValue;
86         mObservedValue = value;
87         handleValueChanged(value, changed);
88     }
89 
setUserId(int userId)90     public void setUserId(int userId) {
91         mUserId = userId;
92         if (mListening) {
93             setListening(false);
94             setListening(true);
95         }
96     }
97 
getCurrentUser()98     public int getCurrentUser() {
99         return mUserId;
100     }
101 
getKey()102     public String getKey() {
103         return mSettingName;
104     }
105 
isListening()106     public boolean isListening() {
107         return mListening;
108     }
109 }
110