src/share/classes/java/util/function/DoubleUnaryOperator.java

rev 7675 : 8019840: Spec updates for java.util.function
Reviewed-by: mduigou
Contributed-by: brian.goetz@oracle.com

*** 25,89 ****
  package java.util.function;
  
  import java.util.Objects;
  
  /**
!  * An operation on a {@code double} operand yielding a {@code double}
!  * result. This is the primitive type specialization of {@link UnaryOperator}
!  * for {@code double}.
   *
   * @see UnaryOperator
   * @since 1.8
   */
  @FunctionalInterface
  public interface DoubleUnaryOperator {
  
      /**
!      * Returns the {@code double} result of the operation upon the
!      * {@code double} operand.
       *
!      * @param operand the operand value
!      * @return the operation result value
       */
      double applyAsDouble(double operand);
  
      /**
!      * Compose a new function which applies the provided function followed by
!      * this function.  If either function throws an exception, it is relayed
!      * to the caller.
!      *
!      * @param before An additional function to be applied before this function
!      * is applied
!      * @return A function which performs the provided function followed by this
!      * function
       * @throws NullPointerException if before is null
       */
      default DoubleUnaryOperator compose(DoubleUnaryOperator before) {
          Objects.requireNonNull(before);
          return (double v) -> applyAsDouble(before.applyAsDouble(v));
      }
  
      /**
!      * Compose a new function which applies this function followed by the
!      * provided function.  If either function throws an exception, it is relayed
!      * to the caller.
!      *
!      * @param after An additional function to be applied after this function is
!      * applied
!      * @return A function which performs this function followed by the provided
!      * function followed
       * @throws NullPointerException if after is null
       */
      default DoubleUnaryOperator andThen(DoubleUnaryOperator after) {
          Objects.requireNonNull(after);
          return (double t) -> after.applyAsDouble(applyAsDouble(t));
      }
  
      /**
!      * Returns a unary operator that provides its input value as the result.
       *
!      * @return a unary operator that provides its input value as the result
       */
      static DoubleUnaryOperator identity() {
          return t -> t;
      }
  }
--- 25,95 ----
  package java.util.function;
  
  import java.util.Objects;
  
  /**
!  * Represents an operation on a single {@code double}-valued operand that produces
!  * a {@code double}-valued result.  This is the primitive type specialization of
!  * {@link UnaryOperator} for {@code double}.
!  *
!  * <p>This is a <a href="package-summary.html">functional interface</a>
!  * whose functional method is {@link #applyAsDouble(double)}.
   *
   * @see UnaryOperator
   * @since 1.8
   */
  @FunctionalInterface
  public interface DoubleUnaryOperator {
  
      /**
!      * Applies this operator to the given operand.
       *
!      * @param operand the operand
!      * @return the operator result
       */
      double applyAsDouble(double operand);
  
      /**
!      * Returns a composed operator that first applies the {@code before}
!      * operator to its input, and then applies this operator to the result.
!      * If evaluation of either operator throws an exception, it is relayed to
!      * the caller of the composed operator.
!      *
!      * @param before the operator to apply before this operator is applied
!      * @return a composed operator that first applies the {@code before}
!      * operator and then applies this operator
       * @throws NullPointerException if before is null
+      *
+      * @see #andThen(DoubleUnaryOperator)
       */
      default DoubleUnaryOperator compose(DoubleUnaryOperator before) {
          Objects.requireNonNull(before);
          return (double v) -> applyAsDouble(before.applyAsDouble(v));
      }
  
      /**
!      * Returns a composed operator that first applies this operator to
!      * its input, and then applies the {@code after} operator to the result.
!      * If evaluation of either operator throws an exception, it is relayed to
!      * the caller of the composed operator.
!      *
!      * @param after the operator to apply after this operator is applied
!      * @return a composed operator that first applies this operator and then
!      * applies the {@code after} operator
       * @throws NullPointerException if after is null
+      * 
+      * @see #compose(DoubleUnaryOperator)
       */
      default DoubleUnaryOperator andThen(DoubleUnaryOperator after) {
          Objects.requireNonNull(after);
          return (double t) -> after.applyAsDouble(applyAsDouble(t));
      }
  
      /**
!      * Returns a unary operator that always returns its input argument.
       *
!      * @return a unary operator that always returns its input argument
       */
      static DoubleUnaryOperator identity() {
          return t -> t;
      }
  }