freemarker.template.utility

Class NumberUtil

java.lang.Object

freemarker.template.utility.NumberUtil

public class NumberUtil
extends java.lang.Object

Number- and math-related utilities.

Since:

2.3.20

Method Summary

Modifier and Type	Method and Description
static int	getSignum(java.lang.Number num)
static boolean	hasTypeThatIsKnownToNotSupportInfiniteAndNaN(java.lang.Number num) Tells if the type of the parameter number is known to not be able to represent infinite (positive or negative) and NaN.
static boolean	isInfinite(java.lang.Number num)
static boolean	isIntegerBigDecimal(java.math.BigDecimal bd) Tells if a BigDecimal stores a whole number.
static boolean	isNaN(java.lang.Number num)
static int	toIntExact(java.lang.Number num) Converts a Number to int whose mathematical value is exactly the same as of the original number.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isInfinite

public static boolean isInfinite(java.lang.Number num)

isNaN

public static boolean isNaN(java.lang.Number num)

getSignum

public static int getSignum(java.lang.Number num)
                     throws java.lang.ArithmeticException

Returns:

-1 for negative, 0 for zero, 1 for positive.

Throws:

java.lang.ArithmeticException - if the number is NaN

isIntegerBigDecimal

public static boolean isIntegerBigDecimal(java.math.BigDecimal bd)

Tells if a BigDecimal stores a whole number. For example, it returns true for 1.0000, but false for 1.0001.

Since:

2.3.21

hasTypeThatIsKnownToNotSupportInfiniteAndNaN

public static boolean hasTypeThatIsKnownToNotSupportInfiniteAndNaN(java.lang.Number num)

Tells if the type of the parameter number is known to not be able to represent infinite (positive or negative) and NaN. If this returns false, that doesn't mean that it can do that, because it's maybe just that this utility doesn't know that type.

Since:

2.3.28

toIntExact

public static int toIntExact(java.lang.Number num)

Converts a Number to int whose mathematical value is exactly the same as of the original number.

Throws:

java.lang.ArithmeticException - if the conversion to int is not possible without losing precision or overflow/underflow.

Since:

2.3.22