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java.lang.Object | +--net.sf.saxon.value.Value | +--net.sf.saxon.value.AtomicValue | +--net.sf.saxon.value.NumericValue | +--net.sf.saxon.value.DoubleValue
A numeric (double precision floating point) value
Field Summary | |
static DoubleValue |
NaN
|
static DoubleValue |
ZERO
|
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
DoubleValue(java.lang.CharSequence val)
Constructor supplying a string |
|
DoubleValue(double value)
Constructor supplying a double |
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()
Return this numeric value as a double |
ItemType |
getItemType()
Determine the data type of the expression |
java.lang.String |
getStringValue()
Convert the value to a string, using the serialization 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 |
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 |
Field Detail |
public static final DoubleValue ZERO
public static final DoubleValue NaN
Constructor Detail |
public DoubleValue(java.lang.CharSequence val) throws DynamicError
DynamicError
- 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.public DoubleValue(double value)
value
- the value of the NumericValueMethod Detail |
public double getDoubleValue()
getDoubleValue
in class NumericValue
public int hashCode()
hashCode
in class NumericValue
NumericValue.hashCode()
public boolean isNaN()
isNaN
in class NumericValue
public boolean effectiveBooleanValue(XPathContext context)
effectiveBooleanValue
in interface Expression
effectiveBooleanValue
in class AtomicValue
context
-
public AtomicValue convert(int requiredType, XPathContext context) throws XPathException
convert
in class AtomicValue
requiredType
- an integer identifying the required atomic typecontext
- 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.
XPathException
- if the conversion is not possiblepublic java.lang.String getStringValue()
AtomicValue
getStringValue
in interface Item
getStringValue
in class AtomicValue
public ItemType getItemType()
public NumericValue negate()
negate
in class NumericValue
public NumericValue floor()
floor
in class NumericValue
public NumericValue ceiling()
ceiling
in class NumericValue
public NumericValue round()
round
in class NumericValue
public NumericValue roundToHalfEven(int scale)
roundToHalfEven
in class NumericValue
scale
- the decimal position for rounding: e.g. 2 rounds to a
multiple of 0.01, while -2 rounds to a multiple of 100
public boolean isWholeNumber()
isWholeNumber
in class NumericValue
public NumericValue arithmetic(int operator, NumericValue other, XPathContext context) throws XPathException
arithmetic
in class NumericValue
operator
- the binary arithmetic operation to be performed. Uses
the constants defined in the Tokenizer classother
- the other operand
XPathException
- if an arithmetic error occursTokenizer
public java.lang.Object convertToJava(java.lang.Class target, Configuration config, XPathContext context) throws XPathException
convertToJava
in class AtomicValue
target
- The class required by the external functionconfig
- The configuration (needed for access to schema information)
XPathException
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