RxSharedPreferencesMigration

abstract @NonNull Single<@NonNull T> migrate(
    @NonNull <Error class: unknown class> sharedPreferencesView,
    @NonNull T currentData
)

Maps SharedPreferences into T. Implementations should be idempotent since this may be called multiple times. See DataMigration.migrate for more information. The method accepts a SharedPreferencesView which is the view of the SharedPreferences to migrate from (limited to keysToMigrate and a T which represent the current data. The function must return the migrated data.

If SharedPreferences is empty or does not contain any keys which you specified, this callback will not run.

default @NonNull Single<@NonNull Boolean> shouldMigrate(@NonNull T currentData)

Whether or not the migration should be run. This can be used to skip a read from the SharedPreferences.