java.lang.Object
- net.sf.saxon.value.Value
- - net.sf.saxon.value.AtomicValue
  - - net.sf.saxon.value.NumericValue
    - - net.sf.saxon.value.DoubleValue

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable, PullEvent, SequenceIterable, GroundedValue, Item, ValueRepresentation, ConversionResult
```
public final class DoubleValue
extends NumericValue
```
A numeric (double precision floating point) value

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static DoubleValue NaN

static DoubleValue NEGATIVE_ZERO

static DoubleValue ONE

static DoubleValue ZERO
- Fields inherited from class net.sf.saxon.value.AtomicValue
  typeLabel
- 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

Constructor Summary

Constructors
Constructor	Description
`DoubleValue(double value)`	Constructor supplying a double
`DoubleValue(double value, AtomicType type)`	Constructor supplying a double and an AtomicType, for creating a value that belongs to a user-defined subtype of xs:double.
`DoubleValue(java.lang.CharSequence val)`	Constructor supplying a string

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`NumericValue`	`ceiling()`	Implement the XPath ceiling() function
`int`	`compareTo(long other)`	Compare the value to a long.
`ConversionResult`	`convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context)`	Convert to target data type
`AtomicValue`	`copyAsSubType(AtomicType typeLabel)`	Create a copy of this atomic value, with a different type label
`static java.lang.CharSequence`	`doubleToString(double value)`	Internal method used for conversion of a double to a string
`boolean`	`effectiveBooleanValue()`	Get the effective boolean value
`NumericValue`	`floor()`	Implement the XPath floor() function
`java.lang.CharSequence`	`getCanonicalLexicalRepresentation()`	Get the canonical lexical representation as defined in XML Schema.
`double`	`getDoubleValue()`	Return this numeric value as a double
`BuiltInAtomicType`	`getPrimitiveType()`	Determine the primitive type of the value.
`java.lang.Comparable`	`getSchemaComparable()`	Get an object that implements XML Schema comparison semantics
`java.lang.String`	`getStringValue()`	Convert the double to a string according to the XPath 2.0 rules
`java.lang.CharSequence`	`getStringValueCS()`	Convert the double to a string according to the XPath 2.0 rules
`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
`static void`	`printInternalForm(double d)`	Diagnostic method: print the sign, exponent, and significand
`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
compareTo, equals, getDecimalValue, getFloatValue, 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, convertToJava, fromItem, getIterator, iterate, makeQNameValue, reduce, stringToNumber

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - ZERO
```
public static final DoubleValue ZERO
```
  - NEGATIVE_ZERO
```
public static final DoubleValue NEGATIVE_ZERO
```
  - ONE
```
public static final DoubleValue ONE
```
  - NaN
```
public static final DoubleValue NaN
```
- Constructor Detail
  - DoubleValue
```
public DoubleValue(java.lang.CharSequence val)
            throws ValidationException
```
    Constructor supplying a string
    
    Parameters:
    
    val - the string representation of the double value, conforming to the XML Schema lexical representation of xs:double, with leading and trailing spaces permitted
    
    Throws:
    
    ValidationException - if the string does not have the correct lexical form for a double. Note that the error will contain no error code or context information.
  - DoubleValue
```
public DoubleValue(double value)
```
    Constructor supplying a double
    
    Parameters:
    
    value - the value of the NumericValue
  - DoubleValue
```
public DoubleValue(double value,
                   AtomicType type)
```
    Constructor supplying a double and an AtomicType, for creating a value that belongs to a user-defined subtype of xs:double. 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:double, and the value must conform to this type. The methosd 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
  - getDoubleValue
```
public double getDoubleValue()
```
    Return this numeric value as a double
    
    Overrides:
    
    getDoubleValue in class NumericValue
    
    Returns:
    
    the value as a double
  - 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:
    
    the effective boolean value (true unless the value is zero or NaN)
  - convertPrimitive
```
public ConversionResult convertPrimitive(BuiltInAtomicType requiredType,
                                         boolean validate,
                                         XPathContext context)
```
    Convert to target data type
    
    Specified by:
    
    convertPrimitive in class AtomicValue
    
    Parameters:
    
    requiredType - an integer identifying the required atomic type
    
    validate - true if the supplied value must be validated, false if the caller warrants that it is valid
    
    context - the XPath dynamic context
    
    Returns:
    
    an AtomicValue, a value of the required type
  - getStringValue
```
public java.lang.String getStringValue()
```
    Convert the double to a string according to the XPath 2.0 rules
    
    Specified by:
    
    getStringValue in interface Item
    
    Specified by:
    
    getStringValue in interface ValueRepresentation
    
    Specified by:
    
    getStringValue in class AtomicValue
    
    Returns:
    
    the string value
    
    See Also:
    
    Item.getStringValueCS()
  - getStringValueCS
```
public java.lang.CharSequence getStringValueCS()
```
    Convert the double to a string according to the XPath 2.0 rules
    
    Specified by:
    
    getStringValueCS in interface Item
    
    Specified by:
    
    getStringValueCS in interface ValueRepresentation
    
    Overrides:
    
    getStringValueCS in class AtomicValue
    
    Returns:
    
    the string value
    
    See Also:
    
    Item.getStringValue()
  - getCanonicalLexicalRepresentation
```
public java.lang.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:double, 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
  - doubleToString
```
public static java.lang.CharSequence doubleToString(double value)
```
    Internal method used for conversion of a double to a string
    
    Parameters:
    
    value - the actual value
    
    Returns:
    
    the value converted to a string, according to the XPath casting 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(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 java.lang.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
  - printInternalForm
```
public static void printInternalForm(double d)
```
    Diagnostic method: print the sign, exponent, and significand
    
    Parameters:
    
    d - the double to be diagnosed

Modifier and Type	Field	Description
`static DoubleValue`	`NaN`
`static DoubleValue`	`NEGATIVE_ZERO`
`static DoubleValue`	`ONE`
`static DoubleValue`	`ZERO`

Class DoubleValue

Field Summary

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

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

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

Constructor Summary

Method Summary

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

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

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

Methods inherited from class java.lang.Object

Field Detail

ZERO

NEGATIVE_ZERO

ONE

NaN

Constructor Detail

DoubleValue

DoubleValue

DoubleValue

Method Detail

copyAsSubType

getPrimitiveType

getDoubleValue

hashCode

isNaN

effectiveBooleanValue

convertPrimitive

getStringValue

getStringValueCS

getCanonicalLexicalRepresentation

doubleToString

negate

floor

ceiling

round

roundHalfToEven

signum

isWholeNumber

compareTo

getSchemaComparable

printInternalForm