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/*
* Copyright (C) 2016 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.provider;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.database.sqlite.SQLiteDatabase;
import android.os.Binder;
import android.util.Log;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.LauncherSettings.Favorites;
import com.android.launcher3.util.IntArray;
import java.util.Locale;
/**
* A set of utility methods for Launcher DB used for DB updates and migration.
*/
public class LauncherDbUtils {
private static final String TAG = "LauncherDbUtils";
/**
* Makes the first screen as screen 0 (if screen 0 already exists,
* renames it to some other number).
* If the first row of screen 0 is non empty, runs a 'lossy' GridMigrationTask to clear
* the first row. The items in the first screen are moved and resized but the carry-forward
* items are simply deleted.
*/
public static boolean prepareScreenZeroToHostQsb(Context context, SQLiteDatabase db) {
try (SQLiteTransaction t = new SQLiteTransaction(db)) {
// Get the first screen
final int firstScreenId;
try (Cursor c = db.rawQuery(String.format(Locale.ENGLISH,
"SELECT MIN(%1$s) from %2$s where %3$s = %4$d",
Favorites.SCREEN, Favorites.TABLE_NAME, Favorites.CONTAINER,
Favorites.CONTAINER_DESKTOP), null)) {
if (!c.moveToNext()) {
// No update needed
t.commit();
return true;
}
firstScreenId = c.getInt(0);
}
if (firstScreenId != 0) {
// Rename the first screen to 0.
renameScreen(db, firstScreenId, 0);
}
// Check if the first row is empty
if (DatabaseUtils.queryNumEntries(db, Favorites.TABLE_NAME,
"container = -100 and screen = 0 and cellY = 0") == 0) {
// First row is empty, no need to migrate.
t.commit();
return true;
}
new LossyScreenMigrationTask(context, LauncherAppState.getIDP(context), db)
.migrateScreen0();
t.commit();
return true;
} catch (Exception e) {
Log.e(TAG, "Failed to update workspace size", e);
return false;
}
}
private static void renameScreen(SQLiteDatabase db, int oldScreen, int newScreen) {
String[] whereParams = new String[] { Integer.toString(oldScreen) };
ContentValues values = new ContentValues();
values.put(Favorites.SCREEN, newScreen);
db.update(Favorites.TABLE_NAME, values, "container = -100 and screen = ?", whereParams);
}
public static IntArray queryIntArray(SQLiteDatabase db, String tableName, String columnName,
String selection, String groupBy, String orderBy) {
IntArray out = new IntArray();
try (Cursor c = db.query(tableName, new String[] { columnName }, selection, null,
groupBy, null, orderBy)) {
while (c.moveToNext()) {
out.add(c.getInt(0));
}
}
return out;
}
public static boolean tableExists(SQLiteDatabase db, String tableName) {
try (Cursor c = db.query(true, "sqlite_master", new String[] {"tbl_name"},
"tbl_name = ?", new String[] {tableName},
null, null, null, null, null)) {
return c.getCount() > 0;
}
}
public static void dropTable(SQLiteDatabase db, String tableName) {
db.execSQL("DROP TABLE IF EXISTS " + tableName);
}
/**
* Utility class to simplify managing sqlite transactions
*/
public static class SQLiteTransaction extends Binder implements AutoCloseable {
private final SQLiteDatabase mDb;
public SQLiteTransaction(SQLiteDatabase db) {
mDb = db;
db.beginTransaction();
}
public void commit() {
mDb.setTransactionSuccessful();
}
@Override
public void close() {
mDb.endTransaction();
}
public SQLiteDatabase getDb() {
return mDb;
}
}
}
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