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:
java.lang.Comparable, Expression, Item, java.io.Serializable

public final class FloatValue
extends NumericValue

A numeric (single precision floating point) value

See Also:
Serialized Form

Field Summary
 
Fields inherited from interface net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
 
Constructor Summary
FloatValue(java.lang.CharSequence val)
          Constructor supplying a string
FloatValue(float value)
          Constructor supplying a float
 
Method Summary
 NumericValue arithmetic(int operator, NumericValue other, XPathContext context)
          Evaluate a binary arithmetic operator.
 NumericValue ceiling()
          Implement the XPath ceiling() function
 AtomicValue convert(int requiredType, XPathContext context)
          Convert to target data type
 java.lang.Object convertToJava(java.lang.Class target, Configuration config, XPathContext context)
          Convert to Java object (for passing to external functions)
 boolean effectiveBooleanValue(XPathContext context)
          Get the effective boolean value
 NumericValue floor()
          Implement the XPath floor() function
 double getDoubleValue()
          Get the numeric value as a double
 ItemType getItemType()
          Determine the data type of the expression
 java.lang.String getStringValue()
          Get the value as a String
 float getValue()
          Get the value
 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 roundToHalfEven(int scale)
          Implement the XPath round-to-half-even() function
 
Methods inherited from class net.sf.saxon.value.NumericValue
compareTo, equals, isInteger, longValue, parseNumber, promote, toString
 
Methods inherited from class net.sf.saxon.value.AtomicValue
convert, display, evaluateAsString, evaluateItem, getCardinality, getComponent, getImplementationMethod, getPrimitiveValue, getTypedValue, iterate, process
 
Methods inherited from class net.sf.saxon.value.Value
analyze, asItem, asValue, collapseWhitespace, convertJavaObjectToXPath, getDependencies, getParentExpression, getSpecialProperties, inverse, iterateSubExpressions, normalizeWhitespace, promote, simplify, stringToNumber, trimWhitespace
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

FloatValue

public FloatValue(java.lang.CharSequence val)
           throws DynamicError
Constructor supplying a string


FloatValue

public FloatValue(float value)
Constructor supplying a float

Parameters:
value - the value of the float
Method Detail

getValue

public float getValue()
Get the value


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 NumericValue

effectiveBooleanValue

public boolean effectiveBooleanValue(XPathContext context)
Get the effective boolean value

Specified by:
effectiveBooleanValue in interface Expression
Overrides:
effectiveBooleanValue in class AtomicValue
Parameters:
context -
Returns:
true unless the value is zero or NaN

convert

public AtomicValue convert(int requiredType,
                           XPathContext context)
                    throws XPathException
Convert to target data type

Specified by:
convert in class AtomicValue
Parameters:
requiredType - an integer identifying the required atomic type
context - the evaluation context. Used primarily for error reporting, since nearly all type conversions are context-independent. The value may be null if the context is not known.
Returns:
an AtomicValue, a value of the required type
Throws:
XPathException - if the conversion is not possible

getStringValue

public java.lang.String getStringValue()
Get the value as a String

Specified by:
getStringValue in interface Item
Specified by:
getStringValue in class AtomicValue
Returns:
a String representation of the value

getItemType

public ItemType getItemType()
Determine the data type of the expression

Returns:
Type.DOUBLE

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)

roundToHalfEven

public NumericValue roundToHalfEven(int scale)
Implement the XPath round-to-half-even() function

Specified by:
roundToHalfEven 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

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

arithmetic

public NumericValue arithmetic(int operator,
                               NumericValue other,
                               XPathContext context)
                        throws XPathException
Evaluate a binary arithmetic operator.

Specified by:
arithmetic in class NumericValue
Parameters:
operator - the binary arithmetic operation to be performed. Uses the constants defined in the Tokenizer class
other - the other operand
Returns:
the result of the arithmetic operation
Throws:
XPathException - if an arithmetic error occurs
See Also:
Tokenizer

convertToJava

public java.lang.Object convertToJava(java.lang.Class target,
                                      Configuration config,
                                      XPathContext context)
                               throws XPathException
Convert to Java object (for passing to external functions)

Overrides:
convertToJava in class AtomicValue
Parameters:
target - The class required by the external function
config - The configuration (needed for access to schema information)
Returns:
an object of the target class
XPathException