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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 org.mozilla.thirdparty.com.google.android.exoplayer2.database;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Log;
/**
* An {@link SQLiteOpenHelper} that provides instances of a standalone ExoPlayer database.
*
* <p>Suitable for use by applications that do not already have their own database, or that would
* prefer to keep ExoPlayer tables isolated in their own database. Other applications should prefer
* to use {@link DefaultDatabaseProvider} with their own {@link SQLiteOpenHelper}.
*/
public final class ExoDatabaseProvider extends SQLiteOpenHelper implements DatabaseProvider {
/** The file name used for the standalone ExoPlayer database. */
public static final String DATABASE_NAME = "exoplayer_internal.db";
private static final int VERSION = 1;
private static final String TAG = "ExoDatabaseProvider";
/**
* Provides instances of the database located by passing {@link #DATABASE_NAME} to {@link
* Context#getDatabasePath(String)}.
*
* @param context Any context.
*/
public ExoDatabaseProvider(Context context) {
super(context.getApplicationContext(), DATABASE_NAME, /* factory= */ null, VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// Features create their own tables.
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Features handle their own upgrades.
}
@Override
public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
wipeDatabase(db);
}
/**
* Makes a best effort to wipe the existing database. The wipe may be incomplete if the database
* contains foreign key constraints.
*/
private static void wipeDatabase(SQLiteDatabase db) {
String[] columns = {"type", "name"};
try (Cursor cursor =
db.query(
"sqlite_master",
columns,
/* selection= */ null,
/* selectionArgs= */ null,
/* groupBy= */ null,
/* having= */ null,
/* orderBy= */ null)) {
while (cursor.moveToNext()) {
String type = cursor.getString(0);
String name = cursor.getString(1);
if (!"sqlite_sequence".equals(name)) {
// If it's not an SQL-controlled entity, drop it
String sql = "DROP " + type + " IF EXISTS " + name;
try {
db.execSQL(sql);
} catch (SQLException e) {
Log.e(TAG, "Error executing " + sql, e);
}
}
}
}
}
}
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