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/*
* Copyright (C) 2018 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 com.android.launcher3.model;
import static com.android.launcher3.LauncherSettings.Favorites.BACKUP_TABLE_NAME;
import static com.android.launcher3.provider.LauncherDbUtils.dropTable;
import static com.android.launcher3.provider.LauncherDbUtils.tableExists;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Point;
import android.os.Process;
import android.util.Log;
import com.android.launcher3.LauncherSettings.Favorites;
import com.android.launcher3.LauncherSettings.Settings;
import com.android.launcher3.compat.UserManagerCompat;
/**
* Helper class to backup and restore Favorites table into a separate table
* within the same data base.
*/
public class GridBackupTable {
private static final String TAG = "GridBackupTable";
private static final int ID_PROPERTY = -1;
private static final String KEY_HOTSEAT_SIZE = Favorites.SCREEN;
private static final String KEY_GRID_X_SIZE = Favorites.SPANX;
private static final String KEY_GRID_Y_SIZE = Favorites.SPANY;
private static final String KEY_DB_VERSION = Favorites.RANK;
private final Context mContext;
private final SQLiteDatabase mDb;
private final int mOldHotseatSize;
private final int mOldGridX;
private final int mOldGridY;
private int mRestoredHotseatSize;
private int mRestoredGridX;
private int mRestoredGridY;
public GridBackupTable(Context context, SQLiteDatabase db,
int hotseatSize, int gridX, int gridY) {
mContext = context;
mDb = db;
mOldHotseatSize = hotseatSize;
mOldGridX = gridX;
mOldGridY = gridY;
}
public boolean backupOrRestoreAsNeeded() {
// Check if backup table exists
if (!tableExists(mDb, BACKUP_TABLE_NAME)) {
if (Settings.call(mContext.getContentResolver(), Settings.METHOD_WAS_EMPTY_DB_CREATED)
.getBoolean(Settings.EXTRA_VALUE, false)) {
// No need to copy if empty DB was created.
return false;
}
copyTable(Favorites.TABLE_NAME, BACKUP_TABLE_NAME);
encodeDBProperties();
return false;
}
if (!loadDbProperties()) {
return false;
}
copyTable(BACKUP_TABLE_NAME, Favorites.TABLE_NAME);
Log.d(TAG, "Backup table found");
return true;
}
public int getRestoreHotseatAndGridSize(Point outGridSize) {
outGridSize.set(mRestoredGridX, mRestoredGridY);
return mRestoredHotseatSize;
}
private void copyTable(String from, String to) {
long userSerial = UserManagerCompat.getInstance(mContext).getSerialNumberForUser(
Process.myUserHandle());
dropTable(mDb, to);
Favorites.addTableToDb(mDb, userSerial, false, to);
mDb.execSQL("INSERT INTO " + to + " SELECT * FROM " + from + " where _id > " + ID_PROPERTY);
}
private void encodeDBProperties() {
ContentValues values = new ContentValues();
values.put(Favorites._ID, ID_PROPERTY);
values.put(KEY_DB_VERSION, mDb.getVersion());
values.put(KEY_GRID_X_SIZE, mOldGridX);
values.put(KEY_GRID_Y_SIZE, mOldGridY);
values.put(KEY_HOTSEAT_SIZE, mOldHotseatSize);
mDb.insert(BACKUP_TABLE_NAME, null, values);
}
private boolean loadDbProperties() {
try (Cursor c = mDb.query(BACKUP_TABLE_NAME, new String[] {
KEY_DB_VERSION, // 0
KEY_GRID_X_SIZE, // 1
KEY_GRID_Y_SIZE, // 2
KEY_HOTSEAT_SIZE}, // 3
"_id=" + ID_PROPERTY, null, null, null, null)) {
if (!c.moveToNext()) {
Log.e(TAG, "Meta data not found in backup table");
return false;
}
if (mDb.getVersion() != c.getInt(0)) {
return false;
}
mRestoredGridX = c.getInt(1);
mRestoredGridY = c.getInt(2);
mRestoredHotseatSize = c.getInt(3);
return true;
}
}
}
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