org.jboss.dna.common.math
Class DoubleOperations

java.lang.Object
  org.jboss.dna.common.math.DoubleOperations

All Implemented Interfaces:

Comparator<Double>, MathOperations<Double>

@Immutable
public class DoubleOperations
extends Object
implements MathOperations<Double>, Comparator<Double>

The math operations for double numbers.

Constructor Summary

DoubleOperations()

Method Summary

Double	add(Double value1, Double value2) Add the two operands and return the sum.
BigDecimal	asBigDecimal(Double value) Create a BigDecimal representation of the supplied value.
int	compare(Double value1, Double value2) Compare the two operands and return an integer that describes whether the first value is larger, smaller or the same as the second value.
Double	create(double value) Convert the double representation into the natural object representation.
Double	create(int value) Convert the integer representation into the natural object representation.
Double	create(long value) Convert the long representation into the natural object representation.
Double	createZeroValue() Create the object form of the "zero value".
double	divide(Double value1, Double value2) Divide the first operand by the second, and return the result.
double	doubleValue(Double value) Convert the value to a double.
float	floatValue(Double value) Convert the value to a float.
Double	fromBigDecimal(BigDecimal value) Convert the BigDecimal representation into the natural object representation.
Comparator<Double>	getComparator() Return a Comparator for this operand class.
int	getExponentInScientificNotation(Double value) Get the exponent if the number were written in exponential form.
Class<Double>	getOperandClass() Return the class that these operations operate upon.
Double	increment(Double value) Increment the supplied operand by 1.
int	intValue(Double value) Convert the value to an integer.
Double	keepSignificantFigures(Double value, int numSigFigs)
long	longValue(Double value) Convert the value to a long integer.
Double	maximum(Double value1, Double value2) Compare the two operands and return the one that is larger.
Double	minimum(Double value1, Double value2) Compare the two operands and return the one that is smaller.
Double	multiply(Double value1, Double value2) Multiply the two operands and return the product.
Double	negate(Double value) Negate the supplied operand.
Double	random(Double minimum, Double maximum, Random rng) Generate a random instance within the specified range.
Double	roundDown(Double value, int decimalShift) Round down the supplied value to the desired scale.
Double	roundUp(Double value, int decimalShift) Round up the supplied value to the desired scale.
short	shortValue(Double value) Convert the value to a short.
double	sqrt(Double value) Return the square root of the supplied operand.
Double	subtract(Double value1, Double value2) Subtract the second operand from the first, and return the difference.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

DoubleOperations

public DoubleOperations()

Method Detail

getOperandClass

public Class<Double> getOperandClass()

Description copied from interface: MathOperations

Return the class that these operations operate upon.

Specified by:

getOperandClass in interface MathOperations<Double>

Returns:

the class

add

public Double add(Double value1,
                  Double value2)

Description copied from interface: MathOperations

Add the two operands and return the sum. The zero value is used in place of any operand that is null.

Specified by:

add in interface MathOperations<Double>

Parameters:

value1 - the first operand

value2 - the second operand

Returns:

the sum of the two operands.

subtract

public Double subtract(Double value1,
                       Double value2)

Description copied from interface: MathOperations

Subtract the second operand from the first, and return the difference. The zero value is used in place of any operand that is null.

Specified by:

subtract in interface MathOperations<Double>

Parameters:

value1 - the first operand

value2 - the second operand

Returns:

the difference between the two operands.

multiply

public Double multiply(Double value1,
                       Double value2)

Description copied from interface: MathOperations

Multiply the two operands and return the product. The zero value is used in place of any operand that is null.

Specified by:

multiply in interface MathOperations<Double>

Parameters:

value1 - the first operand

value2 - the second operand

Returns:

the product of the two operands.

divide

public double divide(Double value1,
                     Double value2)

Description copied from interface: MathOperations

Divide the first operand by the second, and return the result. The zero value is used in place of any operand that is null.

Specified by:

divide in interface MathOperations<Double>

Parameters:

value1 - the first operand

value2 - the second operand

Returns:

the result of the division

negate

public Double negate(Double value)

Description copied from interface: MathOperations

Negate the supplied operand. The zero value is used in place of any operand that is null.

Specified by:

negate in interface MathOperations<Double>

Parameters:

value - the value that is to be negated

Returns:

the result of the negation

increment

public Double increment(Double value)

Description copied from interface: MathOperations

Increment the supplied operand by 1. (Note, the exact meaning of "1" is dependent upon the particular operand class. The zero value is used in place of any operand that is null.

Specified by:

increment in interface MathOperations<Double>

Parameters:

value - the value that is to be incremented

Returns:

the incremented value

maximum

public Double maximum(Double value1,
                      Double value2)

Description copied from interface: MathOperations

Compare the two operands and return the one that is larger. A null value is considered smaller than non-null values (including 0).

Specified by:

maximum in interface MathOperations<Double>

Parameters:

value1 - the first operand

value2 - the second operand

Returns:

the larger of the two operands

minimum

public Double minimum(Double value1,
                      Double value2)

Description copied from interface: MathOperations

Compare the two operands and return the one that is smaller. A null value is considered larger than non-null values (including 0).

Specified by:

minimum in interface MathOperations<Double>

Parameters:

value1 - the first operand

value2 - the second operand

Returns:

the smaller of the two operands

compare

public int compare(Double value1,
                   Double value2)

Description copied from interface: MathOperations

Compare the two operands and return an integer that describes whether the first value is larger, smaller or the same as the second value. The semantics are identical to those of Comparable. The zero value is used in place of any operand that is null.

Specified by:

compare in interface Comparator<Double>

Specified by:

compare in interface MathOperations<Double>

Parameters:

value1 - the first operand

value2 - the second operand

Returns:

-1 if the first value is smaller than the second, 1 if the first value is larger than the second, or 0 if they are equal.

asBigDecimal

public BigDecimal asBigDecimal(Double value)

Description copied from interface: MathOperations

Create a BigDecimal representation of the supplied value.

Specified by:

asBigDecimal in interface MathOperations<Double>

Parameters:

value - the value that is to be converted to a BigDecimal

Returns:

the BigDecimal representation, or null if value is null

fromBigDecimal

public Double fromBigDecimal(BigDecimal value)

Description copied from interface: MathOperations

Convert the BigDecimal representation into the natural object representation. This may result in loss of some data (e.g., converting a decimal to an integer results in the loss of the fractional part of the number).

Specified by:

fromBigDecimal in interface MathOperations<Double>

Parameters:

value - the BigDecimal value

Returns:

the natural representation, or null if value is null

createZeroValue

public Double createZeroValue()

Description copied from interface: MathOperations

Create the object form of the "zero value". This is often used to create an uninitialized object.

Specified by:

createZeroValue in interface MathOperations<Double>

Returns:

the object that represents zero.

create

public Double create(int value)

Description copied from interface: MathOperations

Convert the integer representation into the natural object representation.

Specified by:

create in interface MathOperations<Double>

Parameters:

value - the integer value

Returns:

the object representation of the integer

create

public Double create(long value)

Description copied from interface: MathOperations

Convert the long representation into the natural object representation.

Specified by:

create in interface MathOperations<Double>

Parameters:

value - the long value

Returns:

the object representation of the long integer

create

public Double create(double value)

Description copied from interface: MathOperations

Convert the double representation into the natural object representation.

Specified by:

create in interface MathOperations<Double>

Parameters:

value - the double value

Returns:

the object representation of the floating point number

sqrt

public double sqrt(Double value)

Description copied from interface: MathOperations

Return the square root of the supplied operand.

Specified by:

sqrt in interface MathOperations<Double>

Parameters:

value - the value whose root is to be found; may not be null or 0

Returns:

the square root of the value

getComparator

public Comparator<Double> getComparator()

Description copied from interface: MathOperations

Return a Comparator for this operand class. The implementation is free to return the same comparator instance from multiple invocations of this method.

Specified by:

getComparator in interface MathOperations<Double>

Returns:

a comparator

random

public Double random(Double minimum,
                     Double maximum,
                     Random rng)

Description copied from interface: MathOperations

Generate a random instance within the specified range.

Specified by:

random in interface MathOperations<Double>

Parameters:

minimum - the minimum value, or null if the zero-value should be used for the minimum

maximum - the maximum value, or null if the zero-value should be used for the maximum

rng - the random number generator to use

Returns:

an instance of the operand class placed within the desired range using a random distribution, or null if this class does not support generating random instances

doubleValue

public double doubleValue(Double value)

Description copied from interface: MathOperations

Convert the value to a double. This may result in a loss of information depending upon the operand class.

Specified by:

doubleValue in interface MathOperations<Double>

Parameters:

value - the value

Returns:

the representation as a double

floatValue

public float floatValue(Double value)

Description copied from interface: MathOperations

Convert the value to a float. This may result in a loss of information depending upon the operand class.

Specified by:

floatValue in interface MathOperations<Double>

Parameters:

value - the value

Returns:

the representation as a float

intValue

public int intValue(Double value)

Description copied from interface: MathOperations

Convert the value to an integer. This may result in a loss of information depending upon the operand class.

Specified by:

intValue in interface MathOperations<Double>

Parameters:

value - the value

Returns:

the representation as an integer

longValue

public long longValue(Double value)

Description copied from interface: MathOperations

Convert the value to a long integer. This may result in a loss of information depending upon the operand class.

Specified by:

longValue in interface MathOperations<Double>

Parameters:

value - the value

Returns:

the representation as a long

shortValue

public short shortValue(Double value)

Description copied from interface: MathOperations

Convert the value to a short. This may result in a loss of information depending upon the operand class.

Specified by:

shortValue in interface MathOperations<Double>

Parameters:

value - the value

Returns:

the representation as a short

getExponentInScientificNotation

public int getExponentInScientificNotation(Double value)

Description copied from interface: MathOperations

Get the exponent if the number were written in exponential form.

Specified by:

getExponentInScientificNotation in interface MathOperations<Double>

Parameters:

value - the value

Returns:

the scale

roundUp

public Double roundUp(Double value,
                      int decimalShift)

Description copied from interface: MathOperations

Round up the supplied value to the desired scale. This process works (conceptually) by shifting the decimal point of the value by decimalShift places, rounding, and then shifting the decimal point of the rounded value by -decimalShift

For example, consider the number 10.000354. This can be rounded to 10.0004 by calling this method and supplying the value and an "exponentToKeep" value of -4.

Specified by:

roundUp in interface MathOperations<Double>

Parameters:

value - the value to be rounded

decimalShift - the number of places the decimal point should be shifted before rounding

Returns:

the rounded value

roundDown

public Double roundDown(Double value,
                        int decimalShift)

Description copied from interface: MathOperations

Round down the supplied value to the desired scale. This process works (conceptually) by shifting the decimal point of the value by decimalShift places, rounding, and then shifting the decimal point of the rounded value by -decimalShift

For example, consider the number 10.000354. This can be rounded to 10.0003 by calling this method and supplying the value and an "exponentToKeep" value of -4.

Specified by:

roundDown in interface MathOperations<Double>

Parameters:

value - the value to be rounded

decimalShift - the number of places the decimal point should be shifted before rounding

Returns:

the rounded value

keepSignificantFigures

public Double keepSignificantFigures(Double value,
                                     int numSigFigs)

Specified by:

keepSignificantFigures in interface MathOperations<Double>