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.deskclock.data
18 
19 import android.content.SharedPreferences
20 
21 /**
22  * This class encapsulates the transfer of data between widget objects and their permanent storage
23  * in [SharedPreferences].
24  */
25 internal object WidgetDAO {
26     /** Suffix for a key to a preference that stores the instance count for a given widget type.  */
27     private const val WIDGET_COUNT = "_widget_count"
28 
29     /**
30      * @param widgetProviderClass indicates the type of widget being counted
31      * @param count the number of widgets of the given type
32      * @return the delta between the new count and the old count
33      */
updateWidgetCountnull34     fun updateWidgetCount(
35         prefs: SharedPreferences,
36         widgetProviderClass: Class<*>,
37         count: Int
38     ): Int {
39         val key = widgetProviderClass.simpleName + WIDGET_COUNT
40         val oldCount: Int = prefs.getInt(key, 0)
41         if (count == 0) {
42             prefs.edit().remove(key).apply()
43         } else {
44             prefs.edit().putInt(key, count).apply()
45         }
46         return count - oldCount
47     }
48 }