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/*
* Copyright (C) 2009 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.app.backup;
import android.content.Context;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.File;
import java.io.FileDescriptor;
/**
* Base class for the {@link android.app.backup.FileBackupHelper} implementation.
*/
class FileBackupHelperBase {
private static final String TAG = "FileBackupHelperBase";
int mPtr;
Context mContext;
boolean mExceptionLogged;
FileBackupHelperBase(Context context) {
mPtr = ctor();
mContext = context;
}
protected void finalize() throws Throwable {
try {
dtor(mPtr);
} finally {
super.finalize();
}
}
/**
* Check the parameters so the native code doesn't have to throw all the exceptions
* since it's easier to do that from Java.
*/
static void performBackup_checked(ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState, String[] files, String[] keys) {
if (files.length == 0) {
return;
}
// files must be all absolute paths
for (String f: files) {
if (f.charAt(0) != '/') {
throw new RuntimeException("files must have all absolute paths: " + f);
}
}
// the length of files and keys must be the same
if (files.length != keys.length) {
throw new RuntimeException("files.length=" + files.length
+ " keys.length=" + keys.length);
}
// oldStateFd can be null
FileDescriptor oldStateFd = oldState != null ? oldState.getFileDescriptor() : null;
FileDescriptor newStateFd = newState.getFileDescriptor();
if (newStateFd == null) {
throw new NullPointerException();
}
int err = performBackup_native(oldStateFd, data.mBackupWriter, newStateFd, files, keys);
if (err != 0) {
// TODO: more here
throw new RuntimeException("Backup failed 0x" + Integer.toHexString(err));
}
}
boolean writeFile(File f, BackupDataInputStream in) {
int result = -1;
// Create the enclosing directory.
File parent = f.getParentFile();
parent.mkdirs();
result = writeFile_native(mPtr, f.getAbsolutePath(), in.mData.mBackupReader);
if (result != 0) {
// Bail on this entity. Only log one failure per helper object.
if (!mExceptionLogged) {
Log.e(TAG, "Failed restoring file '" + f + "' for app '"
+ mContext.getPackageName() + "\' result=0x"
+ Integer.toHexString(result));
mExceptionLogged = true;
}
}
return (result == 0);
}
public void writeNewStateDescription(ParcelFileDescriptor fd) {
int result = writeSnapshot_native(mPtr, fd.getFileDescriptor());
// TODO: Do something with the error.
}
boolean isKeyInList(String key, String[] list) {
for (String s: list) {
if (s.equals(key)) {
return true;
}
}
return false;
}
private static native int ctor();
private static native void dtor(int ptr);
native private static int performBackup_native(FileDescriptor oldState,
int data, FileDescriptor newState, String[] files, String[] keys);
private static native int writeFile_native(int ptr, String filename, int backupReader);
private static native int writeSnapshot_native(int ptr, FileDescriptor fd);
}
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