Package org.apache.commons.math.dfp

Class DfpDec

java.lang.Object

org.apache.commons.math.dfp.Dfp

org.apache.commons.math.dfp.DfpDec

All Implemented Interfaces:

FieldElement<Dfp>

public class DfpDec
extends Dfp

Subclass of Dfp which hides the radix-10000 artifacts of the superclass. This should give outward appearances of being a decimal number with DIGITS*4-3 decimal digits. This class can be subclassed to appear to be an arbitrary number of decimal digits less than DIGITS*4-3.

Since:

2.2

Version:

$Revision: 1003892 $ $Date: 2010-10-02 23:28:56 +0200 (sam. 02 oct. 2010) $

Field Summary

Fields inherited from class org.apache.commons.math.dfp.Dfp

ERR_SCALE, exp, FINITE, INFINITE, mant, MAX_EXP, MIN_EXP, nans, QNAN, RADIX, sign, SNAN

Constructor Summary

Constructors

Modifier	Constructor	Description
	DfpDec(Dfp d)	Copy constructor.
protected	DfpDec(DfpField factory)	Makes an instance with a value of zero.
protected	DfpDec(DfpField factory, byte x)	Create an instance from a byte value.
protected	DfpDec(DfpField factory, byte sign, byte nans)	Creates an instance with a non-finite value.
protected	DfpDec(DfpField factory, double x)	Create an instance from a double value.
protected	DfpDec(DfpField factory, int x)	Create an instance from an int value.
protected	DfpDec(DfpField factory, long x)	Create an instance from a long value.
protected	DfpDec(DfpField factory, java.lang.String s)	Create an instance from a String representation.

Method Summary

Modifier and Type	Method	Description
protected int	getDecimalDigits()	Get the number of decimal digits this class is going to represent.
Dfp	newInstance()	Create an instance with a value of 0.
Dfp	newInstance(byte x)	Create an instance from a byte value.
Dfp	newInstance(byte sign, byte nans)	Creates an instance with a non-finite value.
Dfp	newInstance(double x)	Create an instance from a double value.
Dfp	newInstance(int x)	Create an instance from an int value.
Dfp	newInstance(long x)	Create an instance from a long value.
Dfp	newInstance(java.lang.String s)	Create an instance from a String representation.
Dfp	newInstance(Dfp d)	Create an instance by copying an existing one.
Dfp	nextAfter(Dfp x)	Returns the next number greater than this one in the direction of x.
protected int	round(int in)	Round this given the next digit n using the current rounding mode.

Methods inherited from class org.apache.commons.math.dfp.Dfp

add, align, ceil, classify, complement, copysign, dfp2sci, dfp2string, divide, divide, dotrap, equals, floor, getField, getOne, getRadixDigits, getTwo, getZero, greaterThan, hashCode, intValue, isInfinite, isNaN, lessThan, log10, log10K, multiply, multiply, negate, power10, power10K, remainder, rint, shiftLeft, shiftRight, sqrt, subtract, toDouble, toSplitDouble, toString, trap, trunc, unequal

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DfpDec

protected DfpDec(DfpField factory)

Makes an instance with a value of zero.

Parameters:

factory - factory linked to this instance

DfpDec

protected DfpDec(DfpField factory,
                 byte x)

Create an instance from a byte value.

Parameters:

factory - factory linked to this instance

x - value to convert to an instance

DfpDec

protected DfpDec(DfpField factory,
                 int x)

Create an instance from an int value.

Parameters:

factory - factory linked to this instance

x - value to convert to an instance

DfpDec

protected DfpDec(DfpField factory,
                 long x)

Create an instance from a long value.

Parameters:

factory - factory linked to this instance

x - value to convert to an instance

DfpDec

protected DfpDec(DfpField factory,
                 double x)

Create an instance from a double value.

Parameters:

factory - factory linked to this instance

x - value to convert to an instance

DfpDec

public DfpDec(Dfp d)

Copy constructor.

Parameters:

d - instance to copy

DfpDec

protected DfpDec(DfpField factory,
                 java.lang.String s)

Create an instance from a String representation.

Parameters:

factory - factory linked to this instance

s - string representation of the instance

DfpDec

protected DfpDec(DfpField factory,
                 byte sign,
                 byte nans)

Creates an instance with a non-finite value.

Parameters:

factory - factory linked to this instance

sign - sign of the Dfp to create

nans - code of the value, must be one of Dfp.INFINITE, Dfp.SNAN, Dfp.QNAN

Method Detail

newInstance

public Dfp newInstance()

Create an instance with a value of 0. Use this internally in preference to constructors to facilitate subclasses

Overrides:

newInstance in class Dfp

Returns:

a new instance with a value of 0

newInstance

public Dfp newInstance(byte x)

Create an instance from a byte value.

Overrides:

newInstance in class Dfp

Parameters:

x - value to convert to an instance

Returns:

a new instance with value x

newInstance

public Dfp newInstance(int x)

Create an instance from an int value.

Overrides:

newInstance in class Dfp

Parameters:

x - value to convert to an instance

Returns:

a new instance with value x

newInstance

public Dfp newInstance(long x)

Create an instance from a long value.

Overrides:

newInstance in class Dfp

Parameters:

x - value to convert to an instance

Returns:

a new instance with value x

newInstance

public Dfp newInstance(double x)

Create an instance from a double value.

Overrides:

newInstance in class Dfp

Parameters:

x - value to convert to an instance

Returns:

a new instance with value x

newInstance

public Dfp newInstance(Dfp d)

Create an instance by copying an existing one. Use this internally in preference to constructors to facilitate subclasses.

Overrides:

newInstance in class Dfp

Parameters:

d - instance to copy

Returns:

a new instance with the same value as d

newInstance

public Dfp newInstance(java.lang.String s)

Create an instance from a String representation. Use this internally in preference to constructors to facilitate subclasses.

Overrides:

newInstance in class Dfp

Parameters:

s - string representation of the instance

Returns:

a new instance parsed from specified string

newInstance

public Dfp newInstance(byte sign,
                       byte nans)

Creates an instance with a non-finite value.

Overrides:

newInstance in class Dfp

Parameters:

sign - sign of the Dfp to create

nans - code of the value, must be one of Dfp.INFINITE, Dfp.SNAN, Dfp.QNAN

Returns:

a new instance with a non-finite value

getDecimalDigits

protected int getDecimalDigits()

Get the number of decimal digits this class is going to represent. Default implementation returns Dfp.getRadixDigits()*4-3. Subclasses can override this to return something less.

Returns:

number of decimal digits this class is going to represent

round

protected int round(int in)

Round this given the next digit n using the current rounding mode.

Overrides:

round in class Dfp

Parameters:

in - ???

Returns:

the IEEE flag if an exception occurred

nextAfter

public Dfp nextAfter(Dfp x)

Returns the next number greater than this one in the direction of x. If this==x then simply returns this.

Overrides:

nextAfter in class Dfp

Parameters:

x - direction where to look at

Returns:

closest number next to instance in the direction of x