Package com.atlassian.confluence.impl.util

Class OptionalUtils

java.lang.Object
com.atlassian.confluence.impl.util.OptionalUtils
public final class OptionalUtils extends Object
Utility methods relating to Optionals.
Since:
6.7.0

  • Method Details

    • zip

      public static <A, B> Optional<io.atlassian.fugue.Pair<A,B>> zip(Optional<A> o1, Optional<B> o2)
      Zips the two given optionals into an optional of a pair. This method can be deleted once we're on Fugue 4.6.0 or later, when its Pair type will contain this method.
      Type Parameters:
      A - the first type
      B - the second type
      Parameters:
      o1 - the first optional
      o2 - the second optional
      Returns:
      empty if either or both optionals are empty

    • first

      @SafeVarargs public static <T, U> Optional<U> first(Optional<T> maybeT, Function<? super T,Optional<U>>... mappers)
      Returns the first non-empty value obtained by separately applying the given mappers to the given Optional.
      Type Parameters:
      T - the input type
      U - the output type
      Parameters:
      maybeT - the optional to which to apply the mappers
      mappers - the mappers to apply one by one
      Returns:
      empty if the given Optional is empty or all the given mappers return an empty

    • firstNonEmpty

      @SafeVarargs public static <T> Optional<T> firstNonEmpty(Supplier<Optional<T>>... lazyOptionals)
      Returns the first of the given Optionals that is non-empty.
      Type Parameters:
      T - the type of value
      Parameters:
      lazyOptionals - the optionals to inspect
      Returns:
      empty if all of the given optionals are empty