| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.backup.encryption; |
| |
| import java.io.IOException; |
| |
| /** Interface for classes which will provide backup data */ |
| public abstract class FullRestoreDownloader { |
| /** Enum to provide information on why a download finished */ |
| public enum FinishType { |
| UNKNOWN_FINISH(0), |
| // Finish the downloading and successfully write data to Android OS. |
| FINISHED(1), |
| // Download failed with any kind of exception. |
| TRANSFER_FAILURE(2), |
| // Download failed due to auth failure on the device. |
| AUTH_FAILURE(3), |
| // Aborted by Android Framework. |
| FRAMEWORK_ABORTED(4); |
| |
| private int mValue; |
| |
| FinishType(int value) { |
| mValue = value; |
| } |
| } |
| |
| /** Get the next data chunk from the backing store */ |
| public abstract int readNextChunk(byte[] buffer) throws IOException; |
| |
| /** Called when we've finished restoring the data */ |
| public abstract void finish(FinishType finishType); |
| } |