1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3.provider; 18 19 import android.content.ContentValues; 20 import android.content.Context; 21 import android.database.Cursor; 22 import android.database.sqlite.SQLiteDatabase; 23 24 import com.android.launcher3.LauncherAppWidgetInfo; 25 import com.android.launcher3.LauncherProvider.DatabaseHelper; 26 import com.android.launcher3.LauncherSettings.Favorites; 27 import com.android.launcher3.ShortcutInfo; 28 import com.android.launcher3.Utilities; 29 import com.android.launcher3.logging.FileLog; 30 import com.android.launcher3.util.LogConfig; 31 32 import java.io.InvalidObjectException; 33 34 /** 35 * Utility class to update DB schema after it has been restored. 36 * 37 * This task is executed when Launcher starts for the first time and not immediately after restore. 38 * This helps keep the model consistent if the launcher updates between restore and first startup. 39 */ 40 public class RestoreDbTask { 41 42 private static final String TAG = "RestoreDbTask"; 43 private static final String RESTORE_TASK_PENDING = "restore_task_pending"; 44 45 private static final String INFO_COLUMN_NAME = "name"; 46 private static final String INFO_COLUMN_DEFAULT_VALUE = "dflt_value"; 47 48 public static boolean performRestore(DatabaseHelper helper) { 49 SQLiteDatabase db = helper.getWritableDatabase(); 50 db.beginTransaction(); 51 try { 52 new RestoreDbTask().sanitizeDB(helper, db); 53 db.setTransactionSuccessful(); 54 return true; 55 } catch (Exception e) { 56 FileLog.e(TAG, "Failed to verify db", e); 57 return false; 58 } finally { 59 db.endTransaction(); 60 } 61 } 62 63 /** 64 * Makes the following changes in the provider DB. 65 * 1. Removes all entries belonging to a managed profile as managed profiles 66 * cannot be restored. 67 * 2. Marks all entries as restored. The flags are updated during first load or as 68 * the restored apps get installed. 69 * 3. If the user serial for primary profile is different than that of the previous device, 70 * update the entries to the new profile id. 71 */ 72 private void sanitizeDB(DatabaseHelper helper, SQLiteDatabase db) throws Exception { 73 long oldProfileId = getDefaultProfileId(db); 74 // Delete all entries which do not belong to the main user 75 int itemsDeleted = db.delete( 76 Favorites.TABLE_NAME, "profileId != ?", new String[]{Long.toString(oldProfileId)}); 77 if (itemsDeleted > 0) { 78 FileLog.d(TAG, itemsDeleted + " items belonging to a managed profile, were deleted"); 79 } 80 81 // Mark all items as restored. 82 boolean keepAllIcons = Utilities.isPropertyEnabled(LogConfig.KEEP_ALL_ICONS); 83 ContentValues values = new ContentValues(); 84 values.put(Favorites.RESTORED, ShortcutInfo.FLAG_RESTORED_ICON 85 | (keepAllIcons ? ShortcutInfo.FLAG_RESTORE_STARTED : 0)); 86 db.update(Favorites.TABLE_NAME, values, null, null); 87 88 // Mark widgets with appropriate restore flag 89 values.put(Favorites.RESTORED, LauncherAppWidgetInfo.FLAG_ID_NOT_VALID | 90 LauncherAppWidgetInfo.FLAG_PROVIDER_NOT_READY | 91 LauncherAppWidgetInfo.FLAG_UI_NOT_READY | 92 (keepAllIcons ? LauncherAppWidgetInfo.FLAG_RESTORE_STARTED : 0)); 93 db.update(Favorites.TABLE_NAME, values, "itemType = ?", 94 new String[]{Integer.toString(Favorites.ITEM_TYPE_APPWIDGET)}); 95 96 long myProfileId = helper.getDefaultUserSerial(); 97 if (Utilities.longCompare(oldProfileId, myProfileId) != 0) { 98 FileLog.d(TAG, "Changing primary user id from " + oldProfileId + " to " + myProfileId); 99 migrateProfileId(db, myProfileId); 100 } 101 } 102 103 /** 104 * Updates profile id of all entries and changes the default value for the column. 105 */ 106 protected void migrateProfileId(SQLiteDatabase db, long newProfileId) { 107 // Update existing entries. 108 ContentValues values = new ContentValues(); 109 values.put(Favorites.PROFILE_ID, newProfileId); 110 db.update(Favorites.TABLE_NAME, values, null, null); 111 112 // Change default value of the column. 113 db.execSQL("ALTER TABLE favorites RENAME TO favorites_old;"); 114 Favorites.addTableToDb(db, newProfileId, false); 115 db.execSQL("INSERT INTO favorites SELECT * FROM favorites_old;"); 116 db.execSQL("DROP TABLE favorites_old;"); 117 } 118 119 /** 120 * Returns the profile id used in the favorites table of the provided db. 121 */ 122 protected long getDefaultProfileId(SQLiteDatabase db) throws Exception { 123 try (Cursor c = db.rawQuery("PRAGMA table_info (favorites)", null)){ 124 int nameIndex = c.getColumnIndex(INFO_COLUMN_NAME); 125 while (c.moveToNext()) { 126 if (Favorites.PROFILE_ID.equals(c.getString(nameIndex))) { 127 return c.getLong(c.getColumnIndex(INFO_COLUMN_DEFAULT_VALUE)); 128 } 129 } 130 throw new InvalidObjectException("Table does not have a profile id column"); 131 } 132 } 133 134 public static boolean isPending(Context context) { 135 return Utilities.getPrefs(context).getBoolean(RESTORE_TASK_PENDING, false); 136 } 137 138 public static void setPending(Context context, boolean isPending) { 139 FileLog.d(TAG, "Restore data received through full backup"); 140 Utilities.getPrefs(context).edit().putBoolean(RESTORE_TASK_PENDING, isPending).commit(); 141 } 142 } 143
