package at.gv.egiz.moazs.util; import java.util.Optional; import static java.util.Optional.ofNullable; /** * Helper function for coalescing nullables value without cluttering code with if-else cascades * @author les2 * @source https://stackoverflow.com/questions/2768054/how-to-get-the-first-non-null-value-in-java */ public class NullCoalesce { /** * @return the first not-null value * @param a * @param b * @param * @return a if a != null, otherwise b. */ public static Optional coalesce(T a, T b) { return a != null ? ofNullable(a) : ofNullable(b); } public static Optional coalesce(T a, T b, T c) { return a != null ? ofNullable(a) : coalesce(b,c); } public static Optional coalesce(T a, T b, T c, T d) { return a != null ? ofNullable(a) : coalesce(b,c,d); } }