Package org.apfloat.spi

Interface ApfloatImpl

All Superinterfaces:

Serializable

All Known Implementing Classes:

DoubleApfloatImpl, FloatApfloatImpl, IntApfloatImpl, LongApfloatImpl

public interface ApfloatImpl
extends Serializable

Interface for apfloat implementations. An ApfloatImpl implements all of the low-level functionality that is needed behind the high-level apfloat API.

A class implementing ApfloatImpl is not required to accept any other ApfloatImpl class as the argument than the same implementing class.

Version:

1.7.0

Author:

Mikko Tommila

Method Summary

Modifier and Type	Method	Description
ApfloatImpl	absCeil()	Returns this ApfloatImpl rounded away from zero.
ApfloatImpl	absFloor()	Returns this ApfloatImpl rounded towards zero.
ApfloatImpl	addOrSubtract(ApfloatImpl x, boolean subtract)	Add or subtract an ApfloatImpl to this object.
int	compareTo(ApfloatImpl x)	Compare this ApfloatImpl and another number.
ApfloatImpl	divideShort(ApfloatImpl x)	Divide this ApfloatImpl by an ApfloatImpl that is "short".
double	doubleValue()	Returns the value of the this number as a double.
long	equalDigits(ApfloatImpl x)	The number of equal digits in this ApfloatImpl and another number.
ApfloatImpl	frac()	Returns the fractional part of this ApfloatImpl.
int	hashCode()	Returns the hash code for this ApfloatImpl.
boolean	isOne()	Tests if this number is equal to 1.
boolean	isShort()	Returns if this ApfloatImpl is "short".
long	longValue()	Returns the value of the this number as a long.
ApfloatImpl	multiply(ApfloatImpl x)	Multiply this object by an ApfloatImpl.
ApfloatImpl	negate()	Returns this ApfloatImpl negated.
long	precision()	Returns the precision of this ApfloatImpl.
ApfloatImpl	precision(long precision)	Returns this ApfloatImpl with the specified precision.
int	radix()	Returns the radix of this ApfloatImpl.
long	scale()	Returns the scale of this ApfloatImpl.
int	signum()	Returns the signum of this ApfloatImpl.
long	size()	Returns the size of the mantissa of this ApfloatImpl.
String	toString(boolean pretty)	Convert this ApfloatImpl to String.
void	writeTo(Writer out, boolean pretty)	Print this ApfloatImpl to a stream.

Method Details

addOrSubtract

ApfloatImpl addOrSubtract(ApfloatImpl x,
 boolean subtract)
                   throws ApfloatRuntimeException

Add or subtract an ApfloatImpl to this object.

Parameters:

x - The number to be added or subtracted to this ApfloatImpl.

subtract - true if the numbers are to be subtracted, false if added.

Returns:

this + x or this - x depending on the subtract argument.

Throws:

ApfloatRuntimeException

multiply

ApfloatImpl multiply(ApfloatImpl x)
              throws ApfloatRuntimeException

Multiply this object by an ApfloatImpl.

Parameters:

x - The number to be multiplied by this ApfloatImpl.

Returns:

this * x.

Throws:

ApfloatRuntimeException

isShort

boolean isShort()
         throws ApfloatRuntimeException

Returns if this ApfloatImpl is "short". Typically ApfloatImpl is "short" if its mantissa fits in one machine word. If the apfloat is "short", some algorithms can be performed faster.

The return value of this method is highly implementation dependent.

Returns:

true if the ApfloatImpl is "short", false if not.

Throws:

ApfloatRuntimeException

See Also:

• Apfloat.isShort()

divideShort

ApfloatImpl divideShort(ApfloatImpl x)
                 throws ApfloatRuntimeException

Divide this ApfloatImpl by an ApfloatImpl that is "short".

Parameters:

x - The number by which this ApfloatImpl is to be divided.

Returns:

this / x.

Throws:

ApfloatRuntimeException

absFloor

ApfloatImpl absFloor()
              throws ApfloatRuntimeException

Returns this ApfloatImpl rounded towards zero.

Returns:

This ApfloatImpl rounded towards zero.

Throws:

ApfloatRuntimeException

absCeil

ApfloatImpl absCeil()
             throws ApfloatRuntimeException

Returns this ApfloatImpl rounded away from zero.

Returns:

This ApfloatImpl rounded away from zero.

Throws:

ApfloatRuntimeException

frac

ApfloatImpl frac()
          throws ApfloatRuntimeException

Returns the fractional part of this ApfloatImpl.

Returns:

The fractional part of this ApfloatImpl.

Throws:

ApfloatRuntimeException

Since:

1.7.0

radix

int radix()

Returns the radix of this ApfloatImpl.

Returns:

The radix of this ApfloatImpl.

precision

long precision()

Returns the precision of this ApfloatImpl.

Returns:

The precision of this ApfloatImpl.

size

long size()
   throws ApfloatRuntimeException

Returns the size of the mantissa of this ApfloatImpl.

Returns:

The size of the mantissa of this ApfloatImpl.

Throws:

ApfloatRuntimeException

Since:

1.2

precision

ApfloatImpl precision(long precision)
               throws ApfloatRuntimeException

Returns this ApfloatImpl with the specified precision.

Parameters:

precision - The precision.

Returns:

This ApfloatImpl with the specified precision.

Throws:

ApfloatRuntimeException

scale

long scale()
    throws ApfloatRuntimeException

Returns the scale of this ApfloatImpl.

Returns:

The scale of this ApfloatImpl.

Throws:

ApfloatRuntimeException

See Also:

• Apfloat.scale()

signum

int signum()

Returns the signum of this ApfloatImpl.

Returns:

The signum of this ApfloatImpl.

See Also:

• Apfloat.signum()

negate

ApfloatImpl negate()
            throws ApfloatRuntimeException

Returns this ApfloatImpl negated.

Returns:

-this.

Throws:

ApfloatRuntimeException

doubleValue

double doubleValue()

Returns the value of the this number as a double. If the number is greater than Double.MAX_VALUE, then Double.POSITIVE_INFINITY is returned.

If the number is less than Double.MIN_VALUE, then Double.NEGATIVE_INFINITY is returned.

If the number is very small in magnitude, underflow may happen and zero is returned.

Returns:

The numeric value represented by this object after conversion to type double.

longValue

long longValue()

Returns the value of the this number as a long. The fractional part is truncated towards zero.

If the number is greater than Long.MAX_VALUE, then Long.MAX_VALUE is returned.

If the number is less than Long.MIN_VALUE, then Long.MIN_VALUE is returned.

Returns:

The numeric value represented by this object after conversion to type long.

isOne

boolean isOne()
       throws ApfloatRuntimeException

Tests if this number is equal to 1.

Returns:

true if this number is equal to one, otherwise false.

Throws:

ApfloatRuntimeException

equalDigits

long equalDigits(ApfloatImpl x)
          throws ApfloatRuntimeException

The number of equal digits in this ApfloatImpl and another number.

Parameters:

x - The number to compare with.

Returns:

The number of equal digits in this ApfloatImpl and x.

Throws:

ApfloatRuntimeException

See Also:

• Apfloat.equalDigits(org.apfloat.Apfloat)

compareTo

int compareTo(ApfloatImpl x)
       throws ApfloatRuntimeException

Compare this ApfloatImpl and another number.

Parameters:

x - The number to compare with.

Returns:

Zero, less than zero or greater than zero depending on the result of the comparison.

Throws:

ApfloatRuntimeException

See Also:

• Apfloat.compareTo(org.apfloat.Apfloat)

hashCode

int hashCode()

Returns the hash code for this ApfloatImpl.

Overrides:

hashCode in class Object

Returns:

The hash code for this ApfloatImpl.

toString

String toString(boolean pretty)
         throws ApfloatRuntimeException

Convert this ApfloatImpl to String.

Parameters:

pretty - Flag for formatting.

Returns:

String representation of this ApfloatImpl.

Throws:

ApfloatRuntimeException

See Also:

• Apfloat.toString(boolean)

writeTo

void writeTo(Writer out,
 boolean pretty)
      throws IOException,
ApfloatRuntimeException

Print this ApfloatImpl to a stream.

Parameters:

out - The stream to write to.

pretty - Flag for formatting.

Throws:

IOException - In case of I/O error writing to the stream.

ApfloatRuntimeException

See Also:

• Apfloat.writeTo(Writer,boolean)