AccountStorage.java

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/*
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 * Copyright (C) 2013 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.cardemulation;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.preference.PreferenceManager;
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import android.util.Log;
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/**
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 * Utility class for persisting account numbers to disk.
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 *
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 * <p>The default SharedPreferences instance is used as the backing storage. Values are cached
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 * in memory for performance.
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 *
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 * <p>This class is thread-safe.
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 */
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public class AccountStorage {
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    private static final String PREF_ACCOUNT_NUMBER = "account_number";
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    private static final String DEFAULT_ACCOUNT_NUMBER = "00000000";
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    private static final String TAG = "AccountStorage";
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    private static String sAccount = null;
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    private static final Object sAccountLock = new Object();
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    public static void SetAccount(Context c, String s) {
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        synchronized(sAccountLock) {
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            Log.i(TAG, "Setting account number: " + s);
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            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);
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            prefs.edit().putString(PREF_ACCOUNT_NUMBER, s).commit();
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            sAccount = s;
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        }
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    }
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    public static String GetAccount(Context c) {
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        synchronized (sAccountLock) {
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            if (sAccount == null) {
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                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);
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                String account = prefs.getString(PREF_ACCOUNT_NUMBER, DEFAULT_ACCOUNT_NUMBER);
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                sAccount = account;
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            }
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            return sAccount;
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        }
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    }
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}