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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.util.Log;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.LauncherSettings.Favorites;
import com.android.launcher3.LauncherSettings.WorkspaceScreens;
import java.util.ArrayList;
import java.util.Collection;
/**
* 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 existing screens
ArrayList<Long> screenIds = getScreenIdsFromCursor(db.query(WorkspaceScreens.TABLE_NAME,
null, null, null, null, null, WorkspaceScreens.SCREEN_RANK));
if (screenIds.isEmpty()) {
// No update needed
t.commit();
return true;
}
if (screenIds.get(0) != 0) {
// First screen is not 0, we need to rename screens
if (screenIds.indexOf(0L) > -1) {
// There is already a screen 0. First rename it to a different screen.
long newScreenId = 1;
while (screenIds.indexOf(newScreenId) > -1) newScreenId++;
renameScreen(db, 0, newScreenId);
}
// Rename the first screen to 0.
renameScreen(db, screenIds.get(0), 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, long oldScreen, long newScreen) {
String[] whereParams = new String[] { Long.toString(oldScreen) };
ContentValues values = new ContentValues();
values.put(WorkspaceScreens._ID, newScreen);
db.update(WorkspaceScreens.TABLE_NAME, values, "_id = ?", whereParams);
values.clear();
values.put(Favorites.SCREEN, newScreen);
db.update(Favorites.TABLE_NAME, values, "container = -100 and screen = ?", whereParams);
}
/**
* Parses the cursor containing workspace screens table and returns the list of screen IDs
*/
public static ArrayList<Long> getScreenIdsFromCursor(Cursor sc) {
try {
return iterateCursor(sc,
sc.getColumnIndexOrThrow(WorkspaceScreens._ID),
new ArrayList<Long>());
} finally {
sc.close();
}
}
public static <T extends Collection<Long>> T iterateCursor(Cursor c, int columnIndex, T out) {
while (c.moveToNext()) {
out.add(c.getLong(columnIndex));
}
return out;
}
/**
* Utility class to simplify managing sqlite transactions
*/
public static class SQLiteTransaction 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();
}
}
}
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