/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.model;
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import static com.android.launcher3.LauncherSettings.Favorites.BACKUP_TABLE_NAME;
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import static com.android.launcher3.provider.LauncherDbUtils.dropTable;
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import static com.android.launcher3.provider.LauncherDbUtils.tableExists;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.graphics.Point;
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import android.os.Process;
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import android.util.Log;
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import com.android.launcher3.LauncherSettings.Favorites;
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import com.android.launcher3.LauncherSettings.Settings;
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import com.android.launcher3.compat.UserManagerCompat;
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/**
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* Helper class to backup and restore Favorites table into a separate table
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* within the same data base.
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*/
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public class GridBackupTable {
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private static final String TAG = "GridBackupTable";
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private static final int ID_PROPERTY = -1;
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private static final String KEY_HOTSEAT_SIZE = Favorites.SCREEN;
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private static final String KEY_GRID_X_SIZE = Favorites.SPANX;
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private static final String KEY_GRID_Y_SIZE = Favorites.SPANY;
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private static final String KEY_DB_VERSION = Favorites.RANK;
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private final Context mContext;
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private final SQLiteDatabase mDb;
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private final int mOldHotseatSize;
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private final int mOldGridX;
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private final int mOldGridY;
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private int mRestoredHotseatSize;
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private int mRestoredGridX;
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private int mRestoredGridY;
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public GridBackupTable(Context context, SQLiteDatabase db,
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int hotseatSize, int gridX, int gridY) {
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mContext = context;
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mDb = db;
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mOldHotseatSize = hotseatSize;
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mOldGridX = gridX;
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mOldGridY = gridY;
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}
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public boolean backupOrRestoreAsNeeded() {
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// Check if backup table exists
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if (!tableExists(mDb, BACKUP_TABLE_NAME)) {
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if (Settings.call(mContext.getContentResolver(), Settings.METHOD_WAS_EMPTY_DB_CREATED)
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.getBoolean(Settings.EXTRA_VALUE, false)) {
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// No need to copy if empty DB was created.
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return false;
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}
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copyTable(Favorites.TABLE_NAME, BACKUP_TABLE_NAME);
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encodeDBProperties();
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return false;
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}
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if (!loadDbProperties()) {
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return false;
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}
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copyTable(BACKUP_TABLE_NAME, Favorites.TABLE_NAME);
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Log.d(TAG, "Backup table found");
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return true;
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}
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public int getRestoreHotseatAndGridSize(Point outGridSize) {
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outGridSize.set(mRestoredGridX, mRestoredGridY);
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return mRestoredHotseatSize;
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}
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private void copyTable(String from, String to) {
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long userSerial = UserManagerCompat.getInstance(mContext).getSerialNumberForUser(
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Process.myUserHandle());
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dropTable(mDb, to);
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Favorites.addTableToDb(mDb, userSerial, false, to);
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mDb.execSQL("INSERT INTO " + to + " SELECT * FROM " + from + " where _id > " + ID_PROPERTY);
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}
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private void encodeDBProperties() {
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ContentValues values = new ContentValues();
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values.put(Favorites._ID, ID_PROPERTY);
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values.put(KEY_DB_VERSION, mDb.getVersion());
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values.put(KEY_GRID_X_SIZE, mOldGridX);
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values.put(KEY_GRID_Y_SIZE, mOldGridY);
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values.put(KEY_HOTSEAT_SIZE, mOldHotseatSize);
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mDb.insert(BACKUP_TABLE_NAME, null, values);
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}
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private boolean loadDbProperties() {
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try (Cursor c = mDb.query(BACKUP_TABLE_NAME, new String[] {
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KEY_DB_VERSION, // 0
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KEY_GRID_X_SIZE, // 1
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KEY_GRID_Y_SIZE, // 2
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KEY_HOTSEAT_SIZE}, // 3
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"_id=" + ID_PROPERTY, null, null, null, null)) {
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if (!c.moveToNext()) {
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Log.e(TAG, "Meta data not found in backup table");
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return false;
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}
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if (mDb.getVersion() != c.getInt(0)) {
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return false;
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}
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mRestoredGridX = c.getInt(1);
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mRestoredGridY = c.getInt(2);
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mRestoredHotseatSize = c.getInt(3);
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return true;
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}
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}
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}
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