Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 *  Copyright 2013-2016 Amazon.com,
 *  Inc. or its affiliates. All Rights Reserved.
 *
 *  Licensed under the Amazon Software License (the "License").
 *  You may not use this file except in compliance with the
 *  License. A copy of the License is located at
 *
 *      http://aws.amazon.com/asl/
 *
 *  or in the "license" file accompanying this file. This file is
 *  distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 *  CONDITIONS OF ANY KIND, express or implied. See the License
 *  for the specific language governing permissions and
 *  limitations under the License.
 */

import android.content.Context;
import android.content.SharedPreferences;

import android.util.Log;

public class Main {
    final static private String TAG = "CognitoDeviceHelper";
    final static private String COGNITO_DEVICE_CACHE = "CognitoIdentityProviderDeviceCache";
    final static private String COGNITO_DEVICE_KEY = "DeviceKey";

    /**
     * Returns the cached key for this device. Device keys are stored in SharedPreferences and are
     * used to track devices. Returns null if no device key was cached.
     *
     * @param username          REQUIRED: The current user.
     * @param userPoolId        REQUIRED: Client ID of the application.
     * @param context           REQUIRED: Application context.
     * @return device key as String, null if the device-key is not available.
     */
    public static String getDeviceKey(String username, String userPoolId, Context context) {
        try {
            SharedPreferences cipCachedDeviceDetails = context
                    .getSharedPreferences(getDeviceDetailsCacheForUser(username, userPoolId), 0);
            if (cipCachedDeviceDetails != null && cipCachedDeviceDetails.contains(COGNITO_DEVICE_KEY)) {
                return cipCachedDeviceDetails.getString(COGNITO_DEVICE_KEY, null);
            }
        } catch (Exception e) {
            Log.e(TAG, "Error accessing SharedPreferences" + e.getMessage());
        }
        return null;
    }

    /**
     * Generates and returns the key to access device details from shared preferences.
     *
     * @param username          REQUIRED: The current user.
     * @param userPoolId        REQUIRED: Client ID of the device.
     * @return a string which is a key to access the device key from SharedPreferences.
     */
    private static String getDeviceDetailsCacheForUser(String username, String userPoolId) {
        return COGNITO_DEVICE_CACHE + "." + userPoolId + "." + username;
    }
}