You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.6 KiB
96 lines
2.6 KiB
/*
|
|
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
|
|
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*/
|
|
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;
|
|
}
|
|
}
|