override fun getFilter(): Filter {
        return object : Filter() {
            override fun performFiltering(constraint: CharSequence?): FilterResults {
                val charString = constraint.toString().toLowerCase()
                items = itemsAll

                val filteredItems = ArrayList<SparesDetailsData>()
                for (sparesData in items) {
                    val tempSpareData = sparesData.copy()
                    tempSpareData.spares = ArrayList()

                    for (spare in sparesData.spares) {
                        if (spare.name.toLowerCase().contains(charString)) {
                            tempSpareData.spares.add(spare)
                        }
                    }
                    filteredItems.add(tempSpareData)
                }
                items = filteredItems
                return FilterResults()
            }

            override fun publishResults(constraint: CharSequence?, results: FilterResults?) {
                notifyDataSetChanged()
            }
        }
    }