Method databaseBuilder

app/src/main/java/androidx/room/Room.java:47–58

Creates a RoomDatabase.Builder for a persistent database. Once a database is built, you should keep a reference to it and re-use it. @param context The context for the database. This is usually the Application context. @param klass The abstract class which is annotated with Database and e

(
            @NonNull Context context, @NonNull Class<T> klass, @NonNull String name)

     * @return A {@code RoomDatabaseBuilder<T>} which you can use to create the database.
     */
    @SuppressWarnings("WeakerAccess")
    @NonNull
    public static <T extends RoomDatabase> RoomDatabase.Builder<T> databaseBuilder(
            @NonNull Context context, @NonNull Class<T> klass, @NonNull String name) {
        //noinspection ConstantConditions
        if (name == null || name.trim().length() == 0) {
            throw new IllegalArgumentException("Cannot build a database with null or empty name."
                    + " If you are trying to create an in memory database, use Room"
                    + ".inMemoryDatabaseBuilder");
        }
        return new RoomDatabase.Builder<>(context, klass, name);
    }

    /**
     * Creates a RoomDatabase.Builder for an in memory database. Information stored in an in memory