| /* |
| * 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, 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); |
| } |
| } |
| } |
| |