Package com.helger.commons.math

Class RoundHelper

java.lang.Object

com.helger.commons.math.RoundHelper

@Immutable
public final class RoundHelper
extends Object

Helper class for rounding numeric values in a flexible way.

Author:

Philip Helger

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RoundHelper.EDecimalType

Method Summary

Modifier and Type	Method	Description
static String	getFormatted(double dValue, int nScale, RoundHelper.EDecimalType eType, Locale aLocale)	Source: http://www.luschny.de/java/doubleformat.html
static String	getFormattedExp(double dValue, int nScale, Locale aLocale)
static String	getFormattedExp2(double dValue, Locale aLocale)
static String	getFormattedFix(double dValue, int nScale, Locale aLocale)
static String	getFormattedFix2(double dValue, Locale aLocale)
static double	getRounded(double dValue, int nScale, RoundingMode eMode, RoundHelper.EDecimalType eType)	Source: http://www.luschny.de/java/doubleformat.html
static double	getRoundedEvenExp(double dValue, int nScale)	Round using the RoundingMode.HALF_EVEN mode and exponential representation
static double	getRoundedEvenExp2(double dValue)	Round using the RoundingMode.HALF_EVEN mode, exponential representation and a precision scale of 2.
static double	getRoundedUpFix(double dValue, int nScale)	Round using the RoundingMode.HALF_UP mode and fix representation
static double	getRoundedUpFix2(double dValue)	Round using the RoundingMode.HALF_UP mode, fix representation and a precision scale of 2.

Methods inherited from class java.lang.Object

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

Method Detail

getRounded

public static double getRounded(double dValue,
                                @Nonnegative
                                int nScale,
                                @Nonnull
                                RoundingMode eMode,
                                @Nonnull
                                RoundHelper.EDecimalType eType)

Source: http://www.luschny.de/java/doubleformat.html

Parameters:

dValue - The value to be rounded

nScale - The precision of the decimal scale. If type is RoundHelper.EDecimalType.FIX the decimal scale, else the (carrying scale - 1). Should be ≥ 0.

eType - The formatting type. May not be null.

eMode - The rounding mode to be used. May not be null.

Returns:

the rounded value according to the specified rules. For NaN and infinite values, the input value is returned as is.

getRoundedUpFix

public static double getRoundedUpFix(double dValue,
                                     @Nonnegative
                                     int nScale)

Round using the RoundingMode.HALF_UP mode and fix representation

Parameters:

dValue - The value to be rounded

nScale - The precision scale

Returns:

the rounded value

getRoundedUpFix2

public static double getRoundedUpFix2(double dValue)

Round using the RoundingMode.HALF_UP mode, fix representation and a precision scale of 2.

Parameters:

dValue - The value to be rounded

Returns:

the rounded value

getRoundedEvenExp

public static double getRoundedEvenExp(double dValue,
                                       @Nonnegative
                                       int nScale)

Round using the RoundingMode.HALF_EVEN mode and exponential representation

Parameters:

dValue - The value to be rounded

nScale - The precision scale

Returns:

the rounded value

getRoundedEvenExp2

public static double getRoundedEvenExp2(double dValue)

Round using the RoundingMode.HALF_EVEN mode, exponential representation and a precision scale of 2.

Parameters:

dValue - The value to be rounded

Returns:

the rounded value

getFormatted

@Nonnull
public static String getFormatted(double dValue,
                                  @Nonnegative
                                  int nScale,
                                  @Nonnull
                                  RoundHelper.EDecimalType eType,
                                  @Nonnull
                                  Locale aLocale)

Source: http://www.luschny.de/java/doubleformat.html

Parameters:

dValue - the value to be formatted

nScale - The precision of the decimal scale. If type is RoundHelper.EDecimalType.FIX the decimal scale, else the (carrying scale - 1). Should be ≥ 0.

eType - The formatting type. May not be null.

aLocale - The locale to be used for the decimal symbols. May not be null.

Returns:

the string representation of the double value. For NaN and infinite values, the return of Double.toString() is returned.

getFormattedFix

@Nonnull
public static String getFormattedFix(double dValue,
                                     @Nonnegative
                                     int nScale,
                                     Locale aLocale)

getFormattedFix2

@Nonnull
public static String getFormattedFix2(double dValue,
                                      Locale aLocale)

getFormattedExp

@Nonnull
public static String getFormattedExp(double dValue,
                                     @Nonnegative
                                     int nScale,
                                     Locale aLocale)

getFormattedExp2

@Nonnull
public static String getFormattedExp2(double dValue,
                                      Locale aLocale)