IEEE754rUtils.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3.math;
import java.util.Objects;
import org.apache.commons.lang3.Validate;
/**
* Provides IEEE-754r variants of NumberUtils methods.
*
* <p>See: <a href="https://en.wikipedia.org/wiki/IEEE_754r">https://en.wikipedia.org/wiki/IEEE_754r</a></p>
*
* @since 2.4
*/
public class IEEE754rUtils {
/**
* Returns the maximum value in an array.
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws NullPointerException if {@code array} is {@code null}
* @throws IllegalArgumentException if {@code array} is empty
* @since 3.4 Changed signature from max(double[]) to max(double...)
*/
public static double max(final double... array) {
Objects.requireNonNull(array, "array");
Validate.isTrue(array.length != 0, "Array cannot be empty.");
// Finds and returns max
double max = array[0];
for (int j = 1; j < array.length; j++) {
max = max(array[j], max);
}
return max;
}
/**
* Gets the maximum of two {@code double} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @return the largest of the values
*/
public static double max(final double a, final double b) {
if (Double.isNaN(a)) {
return b;
}
if (Double.isNaN(b)) {
return a;
}
return Math.max(a, b);
}
/**
* Gets the maximum of three {@code double} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static double max(final double a, final double b, final double c) {
return max(max(a, b), c);
}
/**
* Returns the maximum value in an array.
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws NullPointerException if {@code array} is {@code null}
* @throws IllegalArgumentException if {@code array} is empty
* @since 3.4 Changed signature from max(float[]) to max(float...)
*/
public static float max(final float... array) {
Objects.requireNonNull(array, "array");
Validate.isTrue(array.length != 0, "Array cannot be empty.");
// Finds and returns max
float max = array[0];
for (int j = 1; j < array.length; j++) {
max = max(array[j], max);
}
return max;
}
/**
* Gets the maximum of two {@code float} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @return the largest of the values
*/
public static float max(final float a, final float b) {
if (Float.isNaN(a)) {
return b;
}
if (Float.isNaN(b)) {
return a;
}
return Math.max(a, b);
}
/**
* Gets the maximum of three {@code float} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static float max(final float a, final float b, final float c) {
return max(max(a, b), c);
}
/**
* Returns the minimum value in an array.
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws NullPointerException if {@code array} is {@code null}
* @throws IllegalArgumentException if {@code array} is empty
* @since 3.4 Changed signature from min(double[]) to min(double...)
*/
public static double min(final double... array) {
Objects.requireNonNull(array, "array");
Validate.isTrue(array.length != 0, "Array cannot be empty.");
// Finds and returns min
double min = array[0];
for (int i = 1; i < array.length; i++) {
min = min(array[i], min);
}
return min;
}
/**
* Gets the minimum of two {@code double} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @return the smallest of the values
*/
public static double min(final double a, final double b) {
if (Double.isNaN(a)) {
return b;
}
if (Double.isNaN(b)) {
return a;
}
return Math.min(a, b);
}
/**
* Gets the minimum of three {@code double} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static double min(final double a, final double b, final double c) {
return min(min(a, b), c);
}
/**
* Returns the minimum value in an array.
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws NullPointerException if {@code array} is {@code null}
* @throws IllegalArgumentException if {@code array} is empty
* @since 3.4 Changed signature from min(float[]) to min(float...)
*/
public static float min(final float... array) {
Objects.requireNonNull(array, "array");
Validate.isTrue(array.length != 0, "Array cannot be empty.");
// Finds and returns min
float min = array[0];
for (int i = 1; i < array.length; i++) {
min = min(array[i], min);
}
return min;
}
/**
* Gets the minimum of two {@code float} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @return the smallest of the values
*/
public static float min(final float a, final float b) {
if (Float.isNaN(a)) {
return b;
}
if (Float.isNaN(b)) {
return a;
}
return Math.min(a, b);
}
/**
* Gets the minimum of three {@code float} values.
*
* <p>NaN is only returned if all numbers are NaN as per IEEE-754r.</p>
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static float min(final float a, final float b, final float c) {
return min(min(a, b), c);
}
/**
* Make private in 4.0.
*
* @deprecated TODO Make private in 4.0.
*/
@Deprecated
public IEEE754rUtils() {
// empty
}
}