package org.embulk.input.facebook_ads_insights; import com.google.gson.Gson; import org.embulk.spi.unit.ToStringMap; import java.util.List; import java.util.stream.Collectors; public class Util { private Util() {} public static String stringifyToStringMaps(List value) { Gson gson = new Gson(); return "[" + value.stream().map(gson::toJson).collect(Collectors.joining(",")) + "]"; } }