abstract class BaseRecyclerSearchable(private val mOriginal: MutableList<out TempSearchable>) : RecyclerView.Adapter<BaseRecyclerSearchable.BaseHolder>() {

    private var mAdapterList: MutableList<out TempSearchable>? = null

    init {
        mAdapterList = mOriginal
    }

    private var searchQuery: String? = null
    fun filter(text: String) {
        searchQuery = text
        var text = text
        mAdapterList?.clear()
        if (text.isEmpty()) {
            mAdapterList?.addAll(mOriginal)// error here
        } else {
            text = text.toLowerCase()
            mOriginal.forEach {
                if (it.searchable.toLowerCase().contains(text)) {
                    mAdapterList?.add(it) //error here
                }
            }
        }
        notifyDataSetChanged()
    }

    abstract class BaseHolder(v: View) : RecyclerView.ViewHolder(v)
}