| /* |
| * Copyright (C) 2008 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 android.util; |
| |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * Utility methods for Backup/Restore |
| * @hide |
| */ |
| public class BackupUtils { |
| |
| public static final int NULL = 0; |
| public static final int NOT_NULL = 1; |
| |
| /** |
| * Thrown when there is a backup version mismatch |
| * between the data received and what the system can handle |
| */ |
| public static class BadVersionException extends Exception { |
| public BadVersionException(String message) { |
| super(message); |
| } |
| } |
| |
| public static String readString(DataInputStream in) throws IOException { |
| return (in.readByte() == NOT_NULL) ? in.readUTF() : null; |
| } |
| |
| public static void writeString(DataOutputStream out, String val) throws IOException { |
| if (val != null) { |
| out.writeByte(NOT_NULL); |
| out.writeUTF(val); |
| } else { |
| out.writeByte(NULL); |
| } |
| } |
| } |