java.util.function.IntUnaryOperator Maven / Gradle / Ivy
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/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.util.function;
import java.util.Objects;
/**
* Represents an operation on a single {@code int}-valued operand that produces
* an {@code int}-valued result. This is the primitive type specialization of
* {@link UnaryOperator} for {@code int}.
*
* This is a functional interface
* whose functional method is {@link #applyAsInt(int)}.
*
* @see UnaryOperator
* @since 1.8
*/
@FunctionalInterface
public interface IntUnaryOperator {
/**
* Applies this operator to the given operand.
*
* @param operand the operand
* @return the operator result
*/
int applyAsInt(int 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(IntUnaryOperator)
*/
default IntUnaryOperator compose(IntUnaryOperator before) {
Objects.requireNonNull(before);
return (int v) -> applyAsInt(before.applyAsInt(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(IntUnaryOperator)
*/
default IntUnaryOperator andThen(IntUnaryOperator after) {
Objects.requireNonNull(after);
return (int t) -> after.applyAsInt(applyAsInt(t));
}
/**
* Returns a unary operator that always returns its input argument.
*
* @return a unary operator that always returns its input argument
*/
static IntUnaryOperator identity() {
return t -> t;
}
}