net.sf.saxon.value
Class FloatValue

java.lang.Object
  net.sf.saxon.value.Value
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.NumericValue
              net.sf.saxon.value.FloatValue

All Implemented Interfaces:

Serializable, Comparable, PullEvent, SequenceIterable, GroundedValue, Item, ValueRepresentation, ConversionResult

public final class FloatValue
extends NumericValue

A numeric (single precision floating point) value

See Also:

Serialized Form

Field Summary

static FloatValue	NaN
static FloatValue	NEGATIVE_ZERO
static FloatValue	ONE
static FloatValue	ZERO

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

EMPTY_CLASS_ARRAY, INDETERMINATE_ORDERING

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Constructor Summary

FloatValue(CharSequence val)
Constructor supplying a string

FloatValue(float value)
Constructor supplying a float

FloatValue(float value, AtomicType type)
Constructor supplying a float and an AtomicType, for creating a value that belongs to a user-defined subtype of xs:float.

Method Summary

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
ConversionResult	convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context) Convert to target data type
Object	convertToJava(Class target, XPathContext context) Convert to Java object (for passing to external functions)
AtomicValue	copyAsSubType(AtomicType typeLabel) Create a copy of this atomic value, with a different type label
boolean	effectiveBooleanValue() Get the effective boolean value
NumericValue	floor() Implement the XPath floor() function
CharSequence	getCanonicalLexicalRepresentation() Get the canonical lexical representation as defined in XML Schema.
double	getDoubleValue() Get the numeric value as a double
float	getFloatValue() Get the value
BuiltInAtomicType	getPrimitiveType() Determine the primitive type of the value.
Comparable	getSchemaComparable() Get an object that implements XML Schema comparison semantics
String	getStringValue() Get the value as a String
CharSequence	getStringValueCS() Get the value as a String
int	hashCode() Get the hashCode.
boolean	isNaN() Test whether the value is the double/float value NaN
boolean	isWholeNumber() Determine whether the value is a whole number, that is, whether it compares equal to some integer
NumericValue	negate() Negate the value
NumericValue	round() Implement the XPath round() function
NumericValue	roundHalfToEven(int scale) Implement the XPath round-to-half-even() function
double	signum() Determine whether the value is negative, zero, or positive

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

equals, getDecimalValue, getXPathComparable, isInteger, longValue, parseNumber, promote, toString

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

asAtomic, checkPermittedContents, convert, convert, getCardinality, getComponent, getItemType, getLength, getTypedValue, getTypeLabel, itemAt, iterate, process, setTypeLabel, subsequence

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

asItem, asItem, asIterator, asValue, convertJavaObjectToXPath, convertToJava, fromItem, getIterator, iterate, makeQNameValue, reduce, stringToNumber

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

ZERO

public static final FloatValue ZERO

NEGATIVE_ZERO

public static final FloatValue NEGATIVE_ZERO

ONE

public static final FloatValue ONE

NaN

public static final FloatValue NaN

Constructor Detail

FloatValue

public FloatValue(CharSequence val)
           throws ValidationException

Constructor supplying a string

Throws:

ValidationException

FloatValue

public FloatValue(float value)

Constructor supplying a float

Parameters:

value - the value of the float

FloatValue

public FloatValue(float value,
                  AtomicType type)

Constructor supplying a float and an AtomicType, for creating a value that belongs to a user-defined subtype of xs:float. It is the caller's responsibility to ensure that the supplied value conforms to the supplied type.

Parameters:

value - the value of the NumericValue

type - the type of the value. This must be a subtype of xs:float, and the value must conform to this type. The method does not check these conditions.

Method Detail

copyAsSubType

public AtomicValue copyAsSubType(AtomicType typeLabel)

Create a copy of this atomic value, with a different 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

getFloatValue

public float getFloatValue()

Get the value

Overrides:

getFloatValue in class NumericValue

Returns:

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

getDoubleValue

public double getDoubleValue()

Description copied from class: NumericValue

Get the numeric value as a double

Overrides:

getDoubleValue in class NumericValue

Returns:

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

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()

isNaN

public boolean isNaN()

Test whether the value is the double/float value NaN

Overrides:

isNaN in class AtomicValue

Returns:

true if the value is float NaN or double NaN; otherwise false

effectiveBooleanValue

public boolean effectiveBooleanValue()

Get the effective boolean value

Overrides:

effectiveBooleanValue in class AtomicValue

Returns:

true unless the value is zero or NaN

convertPrimitive

public ConversionResult convertPrimitive(BuiltInAtomicType requiredType,
                                         boolean validate,
                                         XPathContext context)

Convert to target data type

Parameters:

requiredType - an integer identifying the required atomic type

context - XPath dynamic context. Not used when converting from float

validate - true if validation is required. If set to false, the caller guarantees that the value is valid for the target data type, and that further validation is therefore not required. Note that a validation failure may be reported even if validation was not requested.

Returns:

an AtomicValue, a value of the required type; or an ErrorValue

getStringValue

public String getStringValue()

Get the value as a String

Specified by:

getStringValue in interface Item

Specified by:

getStringValue in interface ValueRepresentation

Specified by:

getStringValue in class AtomicValue

Returns:

a String representation of the value

See Also:

Item.getStringValueCS()

getStringValueCS

public CharSequence getStringValueCS()

Get the value as a String

Specified by:

getStringValueCS in interface Item

Specified by:

getStringValueCS in interface ValueRepresentation

Overrides:

getStringValueCS in class AtomicValue

Returns:

a String representation of the value

See Also:

Item.getStringValue()

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:float, the canonical representation always uses exponential notation.

Overrides:

getCanonicalLexicalRepresentation in class Value

Returns:

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

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()

Implement the XPath round() function

Specified by:

round in class NumericValue

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-to-half-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 double signum()

Determine whether the value is negative, zero, or positive

Specified by:

signum in class NumericValue

Returns:

-1 if negative, 0 if zero (including negative 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

compareTo

public int compareTo(Object other)

Description copied from class: NumericValue

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 class AtomicValue

Returns:

a Comparable that follows XML Schema comparison rules

convertToJava

public Object convertToJava(Class target,
                            XPathContext context)
                     throws XPathException

Convert to Java object (for passing to external functions)

Overrides:

convertToJava in class Value

Parameters:

target - the required target class

context - the XPath dynamic evaluation context

Returns:

the (boxed) Java object that best represents the XPath value

Throws:

XPathException