src/java.base/share/classes/java/util/OptionalDouble.java

rev 11381 : 8071670: java.util.Optional: please add a way to specify if-else behavior
Reviewed-by: dfuchs

*** 35,46 ****
   * {@code getAsDouble()} will return the value.
   *
   * <p>Additional methods that depend on the presence or absence of a contained
   * value are provided, such as {@link #orElse(double) orElse()}
   * (return a default value if value not present) and
!  * {@link #ifPresent(java.util.function.DoubleConsumer) ifPresent()} (execute a block
!  * of code if the value is present).
   *
   * <p>This is a <a href="../lang/doc-files/ValueBased.html">value-based</a>
   * class; use of identity-sensitive operations (including reference equality
   * ({@code ==}), identity hash code, or synchronization) on instances of
   * {@code OptionalDouble} may have unpredictable results and should be avoided.
--- 35,46 ----
   * {@code getAsDouble()} will return the value.
   *
   * <p>Additional methods that depend on the presence or absence of a contained
   * value are provided, such as {@link #orElse(double) orElse()}
   * (return a default value if value not present) and
!  * {@link #ifPresent(java.util.function.DoubleConsumer) ifPresent()} (perform an
!  * action if the value is present).
   *
   * <p>This is a <a href="../lang/doc-files/ValueBased.html">value-based</a>
   * class; use of identity-sensitive operations (including reference equality
   * ({@code ==}), identity hash code, or synchronization) on instances of
   * {@code OptionalDouble} may have unpredictable results and should be avoided.
*** 129,148 ****
      public boolean isPresent() {
          return isPresent;
      }
  
      /**
!      * Have the specified consumer accept the value if a value is present,
       * otherwise do nothing.
       *
!      * @param consumer block to be executed if a value is present
!      * @throws NullPointerException if value is present and {@code consumer} is
       * null
       */
!     public void ifPresent(DoubleConsumer consumer) {
          if (isPresent) {
!             consumer.accept(value);
          }
      }
  
      /**
       * If a value is present return a sequential {@link DoubleStream} containing
--- 129,167 ----
      public boolean isPresent() {
          return isPresent;
      }
  
      /**
!      * If a value is present, perform the given action with the value,
       * otherwise do nothing.
       *
!      * @param action the action to be performed if a value is present
!      * @throws NullPointerException if a value is present and {@code action} is
       * null
       */
!     public void ifPresent(DoubleConsumer action) {
          if (isPresent) {
!             action.accept(value);
!         }
!     }
! 
!     /**
!      * If a value is present, perform the given action with the value,
!      * otherwise perform the given empty-based action.
!      *
!      * @param action the action to be performed if a value is present
!      * @param emptyAction the empty-based action to be performed if a value is
!      * not present
!      * @throws NullPointerException if a value is present and {@code action} is
!      * null, or a value is not present and {@code emptyAction} is null.
!      * @since 1.9
!      */
!     public void ifPresentOrElse(DoubleConsumer action, Runnable emptyAction) {
!         if (isPresent) {
!             action.accept(value);
!         } else {
!             emptyAction.run();
          }
      }
  
      /**
       * If a value is present return a sequential {@link DoubleStream} containing