com.landawn.abacus.util.IEEE754rUtil Maven / Gradle / Ivy
/*
* 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 com.landawn.abacus.util;
/**
*
* Note: it's copied from Apache Commons Lang developed at The Apache Software Foundation (http://www.apache.org/), or
* under the Apache License 2.0. The methods copied from other products/frameworks may be modified in this class.
*
*
*
* Provides IEEE-754r variants of NumberUtils methods.
*
*
*
* See: http://en.wikipedia.org/wiki/IEEE_754r
*
*
* @since 2.4
* @version $Id: IEEE754rUtils.java 1436768 2013-01-22 07:07:42Z ggregory $
*/
public final class IEEE754rUtil {
private IEEE754rUtil() {
// singleton.
}
/**
*
* Gets the minimum of two float values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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;
} else if (Float.isNaN(b)) {
return a;
} else {
return Math.min(a, b);
}
}
/**
*
* Gets the minimum of three float values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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);
}
/**
*
* 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 IllegalArgumentException
* if array is null
* @throws IllegalArgumentException
* if array is empty
*/
@SafeVarargs
public static float min(final float... array) {
// Validates input
if (N.isNullOrEmpty(array)) {
throw new IllegalArgumentException("Array cannot be null or 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 double values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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;
} else if (Double.isNaN(b)) {
return a;
} else {
return Math.min(a, b);
}
}
/**
*
* Gets the minimum of three double values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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 IllegalArgumentException
* if array is null
* @throws IllegalArgumentException
* if array is empty
*/
@SafeVarargs
public static double min(final double... array) {
// Validates input
if (N.isNullOrEmpty(array)) {
throw new IllegalArgumentException("Array cannot be null or 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 maximum of two float values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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;
} else if (Float.isNaN(b)) {
return a;
} else {
return Math.max(a, b);
}
}
/**
*
* Gets the maximum of three float values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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 maximum value in an array.
*
*
* @param array
* an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException
* if array is null
* @throws IllegalArgumentException
* if array is empty
*/
@SafeVarargs
public static float max(final float... array) {
// Validates input
if (N.isNullOrEmpty(array)) {
throw new IllegalArgumentException("Array cannot be null or 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 double values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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;
} else if (Double.isNaN(b)) {
return a;
} else {
return Math.max(a, b);
}
}
/**
*
* Gets the maximum of three double values.
*
*
*
* NaN is only returned if all numbers are NaN as per IEEE-754r.
*
*
* @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 IllegalArgumentException
* if array is null
* @throws IllegalArgumentException
* if array is empty
*/
@SafeVarargs
public static double max(final double... array) {
// Validates input
if (N.isNullOrEmpty(array)) {
throw new IllegalArgumentException("Array cannot be null or empty.");
}
// Finds and returns max
double max = array[0];
for (int j = 1; j < array.length; j++) {
max = max(array[j], max);
}
return max;
}
}