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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.backup;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.IOException;
import java.util.TreeMap;
import java.util.Map;
/** @hide */
public class BackupHelperDispatcher {
private static final String TAG = "BackupHelperDispatcher";
TreeMap<String,BackupHelper> mHelpers = new TreeMap<String,BackupHelper>();
public BackupHelperDispatcher() {
}
public void addHelper(String keyPrefix, BackupHelper helper) {
mHelpers.put(keyPrefix, helper);
}
/** TODO: Make this save and restore the key prefix. */
public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState) {
// Write out the state files -- mHelpers is a TreeMap, so the order is well defined.
for (Map.Entry<String,BackupHelper> entry: mHelpers.entrySet()) {
data.setKeyPrefix(entry.getKey());
entry.getValue().performBackup(oldState, data, newState);
}
}
public void performRestore(BackupDataInput input, int appVersionCode,
ParcelFileDescriptor newState)
throws IOException {
boolean alreadyComplained = false;
BackupDataInputStream stream = new BackupDataInputStream(input);
while (input.readNextHeader()) {
String rawKey = input.getKey();
int pos = rawKey.indexOf(':');
if (pos > 0) {
String prefix = rawKey.substring(0, pos);
BackupHelper helper = mHelpers.get(prefix);
if (helper != null) {
stream.dataSize = input.getDataSize();
stream.key = rawKey.substring(pos+1);
helper.restoreEntity(stream);
} else {
if (!alreadyComplained) {
Log.w(TAG, "Couldn't find helper for: '" + rawKey + "'");
alreadyComplained = true;
}
}
} else {
if (!alreadyComplained) {
Log.w(TAG, "Entity with no prefix: '" + rawKey + "'");
alreadyComplained = true;
}
}
input.skipEntityData(); // In case they didn't consume the data.
}
// Write out the state files -- mHelpers is a TreeMap, so the order is well defined.
for (BackupHelper helper: mHelpers.values()) {
helper.writeRestoreSnapshot(newState);
}
}
}
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