net.sf.saxon.value
Class FloatValue

java.lang.Object
  extended by net.sf.saxon.value.Value
      extended by net.sf.saxon.value.AtomicValue
          extended by net.sf.saxon.value.NumericValue
              extended by 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.AtomicValue
typeLabel
 
Fields inherited from class net.sf.saxon.value.Value
INDETERMINATE_ORDERING
 
Fields inherited from interface net.sf.saxon.om.ValueRepresentation
EMPTY_VALUE_ARRAY
 
Constructor Summary
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 abs()
          Get the absolute value as defined by the XPath abs() function
 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, ConversionRules rules)
          Convert to target data type
 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
 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(Value v)
          Determine whether two atomic values are identical, as determined by XML Schema rules.
 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(int scale)
          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, toString
 
Methods inherited from class net.sf.saxon.value.AtomicValue
asAtomic, checkPermittedContents, convert, convert, convert, getCardinality, getComponent, getItemType, getLength, getStringValue, getStringValueCS, getTypedValue, getTypeLabel, itemAt, iterate, process, setTypeLabel, subsequence
 
Methods inherited from class net.sf.saxon.value.Value
asItem, asItem, asIterator, asValue, convertToJava, fromItem, getIterator, iterate, reduce
 
Methods inherited from class java.lang.Object
clone, finalize, 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(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 or precisionDecimal 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,
                                         ConversionRules rules)
Convert to target data type

Specified by:
convertPrimitive in class AtomicValue
Parameters:
requiredType - an integer identifying the required atomic type
rules -
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

getPrimitiveStringValue

public CharSequence getPrimitiveStringValue()
Get the value as a String

Specified by:
getPrimitiveStringValue in class AtomicValue
Returns:
a String representation of the value

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(int scale)
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

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)
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

isIdentical

public boolean isIdentical(Value 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.


Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.