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 package com.android.server.wifi.util;
17 
18 import android.annotation.Nullable;
19 import android.content.Context;
20 import android.net.wifi.WifiMigration;
21 
22 /**
23  * Holder for storing the migration settings data retrieved from
24  * {@link android.net.wifi.WifiMigration#loadFromSettings(Context)} to avoid invoking the method
25  * multiple times.
26  */
27 public class SettingsMigrationDataHolder {
28     private final Context mContext;
29     private WifiMigration.SettingsMigrationData mData = null;
30     private boolean mRetrieved = false;
31 
SettingsMigrationDataHolder(Context context)32     public SettingsMigrationDataHolder(Context context) {
33         mContext = context;
34     }
35 
retrieveDataIfNecessary()36     private void retrieveDataIfNecessary() {
37         if (mRetrieved) return;
38         mData = WifiMigration.loadFromSettings(mContext);
39         mRetrieved = true;
40     }
41 
42     /**
43      * Retrieve the cached data returned from {@link WifiMigration#loadFromSettings(Context)}.
44      */
45     @Nullable
retrieveData()46     public WifiMigration.SettingsMigrationData retrieveData() {
47         retrieveDataIfNecessary();
48         return mData;
49     }
50 }
51