1 /*
2  * Copyright (C) 2013 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.example.android.cardemulation;
18 
19 import android.content.Context;
20 import android.content.SharedPreferences;
21 import android.preference.PreferenceManager;
22 import android.util.Log;
23 
24 /**
25  * Utility class for persisting account numbers to disk.
26  *
27  * <p>The default SharedPreferences instance is used as the backing storage. Values are cached
28  * in memory for performance.
29  *
30  * <p>This class is thread-safe.
31  */
32 public class AccountStorage {
33     private static final String PREF_ACCOUNT_NUMBER = "account_number";
34     private static final String DEFAULT_ACCOUNT_NUMBER = "00000000";
35     private static final String TAG = "AccountStorage";
36     private static String sAccount = null;
37     private static final Object sAccountLock = new Object();
38 
SetAccount(Context c, String s)39     public static void SetAccount(Context c, String s) {
40         synchronized(sAccountLock) {
41             Log.i(TAG, "Setting account number: " + s);
42             SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);
43             prefs.edit().putString(PREF_ACCOUNT_NUMBER, s).commit();
44             sAccount = s;
45         }
46     }
47 
GetAccount(Context c)48     public static String GetAccount(Context c) {
49         synchronized (sAccountLock) {
50             if (sAccount == null) {
51                 SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);
52                 String account = prefs.getString(PREF_ACCOUNT_NUMBER, DEFAULT_ACCOUNT_NUMBER);
53                 sAccount = account;
54             }
55             return sAccount;
56         }
57     }
58 }
59