net.sf.saxon.value

Class DecimalValue

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.value.AtomicValue

net.sf.saxon.value.NumericValue

net.sf.saxon.value.DecimalValue

All Implemented Interfaces:

Comparable, Iterable<AtomicValue>, PullEvent, AtomicMatchKey, AtomicSequence, GroundedValue, IdentityComparable, Item, Sequence, ConversionResult

public final class DecimalValue
extends NumericValue

A decimal value

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	DecimalValue.DecimalComparable A Comparable that performs comparison of a DecimalValue either with another DecimalValue or with some other representation of an XPath numeric value

Field Summary

Fields

Modifier and Type	Field and Description
static BigDecimal	BIG_DECIMAL_ONE_MILLION
static int	DIVIDE_PRECISION
static DecimalValue	ONE
static DecimalValue	THREE
static DecimalValue	TWO
static DecimalValue	ZERO

Fields inherited from class net.sf.saxon.value.AtomicValue

NaN_MATCH_KEY, typeLabel

Constructor Summary

Constructors

Constructor and Description
DecimalValue(BigDecimal value) Constructor supplying a BigDecimal
DecimalValue(double in) Constructor supplying a double
DecimalValue(long in) Constructor supplying a long integer

Method Summary

Methods

Modifier and Type	Method and Description
NumericValue	abs() Get the absolute value as defined by the XPath abs() function
static boolean	castableAsDecimal(CharSequence in) Test whether a string is castable to a decimal value
NumericValue	ceiling() Implement the XPath ceiling() function
int	compareTo(long other) Compare the value to a long
int	compareTo(Object other) Compare the value to another numeric value
AtomicValue	copyAsSubType(AtomicType typeLabel) Create a copy of this atomic value, with a difNferent type label
static FastStringBuffer	decimalToString(BigDecimal value, FastStringBuffer fsb) Convert a decimal value to a string, using the XPath rules for formatting
boolean	effectiveBooleanValue() Get the effective boolean value of the value
NumericValue	floor() Implement the XPath floor() function
CharSequence	getCanonicalLexicalRepresentation() Get the canonical lexical representation as defined in XML Schema.
BigDecimal	getDecimalValue() Get the value
double	getDoubleValue() Get the numeric value as a double
float	getFloatValue() Get the numeric value converted to a float
CharSequence	getPrimitiveStringValue() Get the value as a String
BuiltInAtomicType	getPrimitiveType() Determine the primitive type of the value.
Comparable	getSchemaComparable() Get an object that implements XML Schema comparison semantics
int	hashCode() Get the hashCode.
boolean	isIdentical(AtomicValue v) Determine whether two atomic values are identical, as determined by XML Schema rules.
boolean	isWholeNumber() Determine whether the value is a whole number, that is, whether it compares equal to some integer
long	longValue() Return the numeric value as a Java long.
static ConversionResult	makeDecimalValue(CharSequence in, boolean validate) Factory method to construct a DecimalValue from a string
NumericValue	negate() Negate the value
NumericValue	round(int scale) Implement the XPath round() function
NumericValue	roundHalfToEven(int scale) Implement the XPath round-half-to-even() function
int	signum() Determine whether the value is negative, zero, or positive

Methods inherited from class net.sf.saxon.value.NumericValue

equals, getXPathComparable, isInteger, isNegativeZero, parseNumber, toString

Methods inherited from class net.sf.saxon.value.AtomicValue

asAtomic, asMapKey, atomize, checkPermittedContents, getCardinality, getComponent, getItemType, getStringValue, getStringValueCS, getUType, head, identityHashCode, isIdentical, isNaN, itemAt, iterate, iterator, process, setTypeLabel

Methods inherited from class net.sf.saxon.om.AbstractItem

getLength, reduce, subsequence

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.expr.sort.AtomicMatchKey

asAtomic

Methods inherited from interface net.sf.saxon.om.AtomicSequence

getLength

Methods inherited from interface net.sf.saxon.om.GroundedValue

reduce, subsequence

Field Detail

DIVIDE_PRECISION

public static final int DIVIDE_PRECISION

See Also:

Constant Field Values

BIG_DECIMAL_ONE_MILLION

public static final BigDecimal BIG_DECIMAL_ONE_MILLION

ZERO

public static final DecimalValue ZERO

ONE

public static final DecimalValue ONE

TWO

public static final DecimalValue TWO

THREE

public static final DecimalValue THREE

Constructor Detail

DecimalValue

public DecimalValue(BigDecimal value)

Constructor supplying a BigDecimal

Parameters:

value - the value of the DecimalValue

DecimalValue

public DecimalValue(double in)
             throws ValidationException

Constructor supplying a double

Parameters:

in - the value of the DecimalValue

Throws:

ValidationException - if the supplied value cannot be converted, typically because it is INF or NaN.

DecimalValue

public DecimalValue(long in)

Constructor supplying a long integer

Parameters:

in - the value of the DecimalValue

Method Detail

makeDecimalValue

public static ConversionResult makeDecimalValue(CharSequence in,
                                boolean validate)

Factory method to construct a DecimalValue from a string

Parameters:

in - the value of the DecimalValue

validate - true if validation is required; false if the caller knows that the value is valid

Returns:

the required DecimalValue if the input is valid, or a ValidationFailure encapsulating the error message if not.

castableAsDecimal

public static boolean castableAsDecimal(CharSequence in)

Test whether a string is castable to a decimal value

Parameters:

in - the string to be tested

Returns:

true if the string has the correct format for a decimal

copyAsSubType

public AtomicValue copyAsSubType(AtomicType typeLabel)

Create a copy of this atomic value, with a difNferent type label

Specified by:

copyAsSubType in class AtomicValue

Parameters:

typeLabel - the type label of the new copy. The caller is responsible for checking that the value actually conforms to this type.

Returns:

the copied value

getPrimitiveType

public BuiltInAtomicType getPrimitiveType()

Determine the primitive type of the value. This delivers the same answer as getItemType().getPrimitiveItemType(). The primitive types are the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration, and xs:untypedAtomic. For external objects, the result is AnyAtomicType.

Specified by:

getPrimitiveType in class AtomicValue

Returns:

the primitive type

getDoubleValue

public double getDoubleValue()

Get the numeric value as a double

Specified by:

getDoubleValue in class NumericValue

Returns:

A double representing this numeric value; NaN if it cannot be converted

getFloatValue

public float getFloatValue()

Get the numeric value converted to a float

Specified by:

getFloatValue in class NumericValue

Returns:

a float representing this numeric value; NaN if it cannot be converted

longValue

public long longValue()
               throws XPathException

Return the numeric value as a Java long.

Specified by:

longValue in class NumericValue

Returns:

the numeric value as a Java long. This performs truncation towards zero.

Throws:

XPathException - if the value cannot be converted

getDecimalValue

public BigDecimal getDecimalValue()

Get the value

Specified by:

getDecimalValue in class NumericValue

Returns:

a decimal representing this numeric value;

hashCode

public int hashCode()

Get the hashCode. This must conform to the rules for other NumericValue hashcodes

Specified by:

hashCode in class NumericValue

Returns:

the hash code of the numeric value

See Also:

NumericValue.hashCode()

effectiveBooleanValue

public boolean effectiveBooleanValue()

Description copied from class: AtomicValue

Get the effective boolean value of the value

Specified by:

effectiveBooleanValue in interface GroundedValue

Overrides:

effectiveBooleanValue in class AtomicValue

Returns:

true, unless the value is boolean false, numeric zero, or zero-length string

getCanonicalLexicalRepresentation

public CharSequence getCanonicalLexicalRepresentation()

Get the canonical lexical representation as defined in XML Schema. This is not always the same as the result of casting to a string according to the XPath rules. For xs:decimal, the canonical representation always contains a decimal point.

Specified by:

getCanonicalLexicalRepresentation in interface AtomicSequence

Overrides:

getCanonicalLexicalRepresentation in class AtomicValue

Returns:

the canonical lexical representation if defined in XML Schema; otherwise, the result of casting to string according to the XPath 2.0 rules

getPrimitiveStringValue

public CharSequence getPrimitiveStringValue()

Get the value as a String

Specified by:

getPrimitiveStringValue in class AtomicValue

Returns:

a String representation of the value

decimalToString

public static FastStringBuffer decimalToString(BigDecimal value,
                               FastStringBuffer fsb)

Convert a decimal value to a string, using the XPath rules for formatting

Parameters:

value - the decimal value to be converted

fsb - the FastStringBuffer to which the value is to be appended

Returns:

the supplied FastStringBuffer, suitably populated

negate

public NumericValue negate()

Negate the value

Specified by:

negate in class NumericValue

Returns:

a value, of the same type as the original, with its sign inverted

floor

public NumericValue floor()

Implement the XPath floor() function

Specified by:

floor in class NumericValue

Returns:

a value, of the same type as that supplied, rounded towards minus infinity

ceiling

public NumericValue ceiling()

Implement the XPath ceiling() function

Specified by:

ceiling in class NumericValue

Returns:

a value, of the same type as that supplied, rounded towards plus infinity

round

public NumericValue round(int scale)

Implement the XPath round() function

Specified by:

round in class NumericValue

Parameters:

scale - the number of decimal places required in the result (supply 0 for rounding to an integer)

Returns:

a value, of the same type as that supplied, rounded towards the nearest whole number (0.5 rounded up)

roundHalfToEven

public NumericValue roundHalfToEven(int scale)

Implement the XPath round-half-to-even() function

Specified by:

roundHalfToEven in class NumericValue

Parameters:

scale - the decimal position for rounding: e.g. 2 rounds to a multiple of 0.01, while -2 rounds to a multiple of 100

Returns:

a value, of the same type as the original, rounded towards the nearest multiple of 10**(-scale), with rounding towards the nearest even number if two values are equally near

signum

public int signum()

Determine whether the value is negative, zero, or positive

Specified by:

signum in class NumericValue

Returns:

-1 if negative, 0 if zero, +1 if positive, NaN if NaN

isWholeNumber

public boolean isWholeNumber()

Determine whether the value is a whole number, that is, whether it compares equal to some integer

Specified by:

isWholeNumber in class NumericValue

Returns:

true if the value is a whole number

abs

public NumericValue abs()

Get the absolute value as defined by the XPath abs() function

Specified by:

abs in class NumericValue

Returns:

the absolute value

Since:

9.2

compareTo

public int compareTo(Object other)

Compare the value to another numeric value

Specified by:

compareTo in interface Comparable

Overrides:

compareTo in class NumericValue

Parameters:

other - The other numeric value

Returns:

-1 if this one is the lower, 0 if they are numerically equal, +1 if this one is the higher, or if either value is NaN. Where NaN values are involved, they should be handled by the caller before invoking this method.

compareTo

public int compareTo(long other)

Compare the value to a long

Specified by:

compareTo in class NumericValue

Parameters:

other - the value to be compared with

Returns:

-1 if this is less, 0 if this is equal, +1 if this is greater or if this is NaN

getSchemaComparable

public Comparable getSchemaComparable()

Get an object that implements XML Schema comparison semantics

Specified by:

getSchemaComparable in interface AtomicSequence

Specified by:

getSchemaComparable in class AtomicValue

Returns:

a Comparable that follows XML Schema comparison rules

isIdentical

public boolean isIdentical(AtomicValue v)

Determine whether two atomic values are identical, as determined by XML Schema rules. This is a stronger test than equality (even schema-equality); for example two dateTime values are not identical unless they are in the same timezone.

Note that even this check ignores the type annotation of the value. The integer 3 and the short 3 are considered identical, even though they are not fully interchangeable. "Identical" means the same point in the value space, regardless of type annotation.

NaN is identical to itself.

Overrides:

isIdentical in class AtomicValue

Parameters:

v - the other value to be compared with this one

Returns:

true if the two values are identical, false otherwise.