60 lines
1.8 KiB
Java
60 lines
1.8 KiB
Java
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/*
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* Copyright (C) 2008 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 android.util;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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/**
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* Utility methods for Backup/Restore
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* @hide
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*/
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// Exported to Mainline modules; cannot use annotations
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// @android.ravenwood.annotation.RavenwoodKeepWholeClass
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public class BackupUtils {
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public static final int NULL = 0;
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public static final int NOT_NULL = 1;
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/**
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* Thrown when there is a backup version mismatch
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* between the data received and what the system can handle
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*/
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public static class BadVersionException extends Exception {
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public BadVersionException(String message) {
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super(message);
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}
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public BadVersionException(String message, Throwable throwable) {
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super(message, throwable);
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}
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}
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public static String readString(DataInputStream in) throws IOException {
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return (in.readByte() == NOT_NULL) ? in.readUTF() : null;
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}
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public static void writeString(DataOutputStream out, String val) throws IOException {
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if (val != null) {
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out.writeByte(NOT_NULL);
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out.writeUTF(val);
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} else {
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out.writeByte(NULL);
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}
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}
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}
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