Package net.sf.saxon.value
Class DoubleValue
- java.lang.Object
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- net.sf.saxon.value.Value
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- net.sf.saxon.value.AtomicValue
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- net.sf.saxon.value.NumericValue
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- net.sf.saxon.value.DoubleValue
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Comparable
,Expression
,Item
,ValueRepresentation
public final class DoubleValue extends NumericValue
A numeric (double precision floating point) value- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description static DoubleValue
NaN
(package private) static java.util.regex.Pattern
nonExponentialPattern
static DoubleValue
ONE
static DoubleValue
ZERO
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Fields inherited from class net.sf.saxon.value.Value
EMPTY_CLASS_ARRAY
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Fields inherited from interface net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
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Fields inherited from interface net.sf.saxon.om.ValueRepresentation
EMPTY_VALUE_ARRAY
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Constructor Summary
Constructors Constructor Description DoubleValue(double value)
Constructor supplying a doubleDoubleValue(java.lang.CharSequence val)
Constructor supplying a string
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description NumericValue
arithmetic(int operator, NumericValue other, XPathContext context)
Evaluate a binary arithmetic operator.NumericValue
ceiling()
Implement the XPath ceiling() functionint
compareTo(long other)
Compare the value to a long.AtomicValue
convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context)
Convert to target data typejava.lang.Object
convertToJava(java.lang.Class target, XPathContext context)
Convert to Java object (for passing to external functions)static java.lang.CharSequence
doubleToString(double value)
Internal method used for conversion of a double to a stringstatic java.lang.CharSequence
doubleToStringOLD(double value, java.lang.String javaString)
Internal method used for conversion of a double to a stringboolean
effectiveBooleanValue(XPathContext context)
Get the effective boolean valueNumericValue
floor()
Implement the XPath floor() functiondouble
getDoubleValue()
Return this numeric value as a doubleItemType
getItemType(TypeHierarchy th)
Determine the data type of the expressionjava.lang.String
getStringValue()
Convert the double to a string according to the XPath 2.0 rulesjava.lang.CharSequence
getStringValueCS()
Convert the double to a string according to the XPath 2.0 rulesint
hashCode()
Get the hashCode.boolean
isNaN()
Test whether the value is the double/float value NaNboolean
isWholeNumber()
Determine whether the value is a whole number, that is, whether it compares equal to some integerNumericValue
negate()
Negate the valuestatic void
printInternalForm(double d)
Diagnostic methodNumericValue
round()
Implement the XPath round() functionNumericValue
roundHalfToEven(int scale)
Implement the XPath round-to-half-even() functiondouble
signum()
Determine whether the value is negative, zero, or positive(package private) static java.lang.String
zeros(int n)
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Methods inherited from class net.sf.saxon.value.NumericValue
compareTo, equals, isInteger, longValue, parseNumber, promote, toString
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Methods inherited from class net.sf.saxon.value.AtomicValue
checkPermittedContents, convert, convert, display, evaluateAsString, evaluateItem, getCardinality, getComponent, getImplementationMethod, getLength, getPrimitiveValue, getTypedValue, hasBuiltInType, iterate, process
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Methods inherited from class net.sf.saxon.value.Value
asItem, asIterator, asValue, convert, convertJavaObjectToXPath, getDependencies, getIterator, getParentExpression, getSpecialProperties, itemAt, iterateSubExpressions, makeQNameValue, optimize, promote, reduce, simplify, stringToNumber, typeCheck
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Field Detail
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ZERO
public static final DoubleValue ZERO
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ONE
public static final DoubleValue ONE
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NaN
public static final DoubleValue NaN
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nonExponentialPattern
static java.util.regex.Pattern nonExponentialPattern
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Constructor Detail
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DoubleValue
public DoubleValue(java.lang.CharSequence val) throws ValidationException
Constructor supplying a string- 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.
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DoubleValue
public DoubleValue(double value)
Constructor supplying a double- Parameters:
value
- the value of the NumericValue
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Method Detail
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getDoubleValue
public double getDoubleValue()
Return this numeric value as a double- Overrides:
getDoubleValue
in classNumericValue
- Returns:
- the value as a double
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hashCode
public int hashCode()
Get the hashCode. This must conform to the rules for other NumericValue hashcodes- Specified by:
hashCode
in classNumericValue
- Returns:
- the hash code of the numeric value
- See Also:
NumericValue.hashCode()
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isNaN
public boolean isNaN()
Test whether the value is the double/float value NaN- Overrides:
isNaN
in classNumericValue
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effectiveBooleanValue
public boolean effectiveBooleanValue(XPathContext context)
Get the effective boolean value- Specified by:
effectiveBooleanValue
in interfaceExpression
- Overrides:
effectiveBooleanValue
in classAtomicValue
- Parameters:
context
-- Returns:
- the effective boolean value (true unless the value is zero or NaN)
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convertPrimitive
public AtomicValue convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context)
Convert to target data type- Specified by:
convertPrimitive
in classAtomicValue
- Parameters:
requiredType
- an integer identifying the required atomic typecontext
-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
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getStringValue
public java.lang.String getStringValue()
Convert the double to a string according to the XPath 2.0 rules- Specified by:
getStringValue
in interfaceItem
- Specified by:
getStringValue
in interfaceValueRepresentation
- Specified by:
getStringValue
in classAtomicValue
- Returns:
- the string value
- See Also:
Item.getStringValueCS()
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getStringValueCS
public java.lang.CharSequence getStringValueCS()
Convert the double to a string according to the XPath 2.0 rules- Specified by:
getStringValueCS
in interfaceItem
- Specified by:
getStringValueCS
in interfaceValueRepresentation
- Overrides:
getStringValueCS
in classAtomicValue
- Returns:
- the string value
- See Also:
Item.getStringValue()
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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.
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doubleToStringOLD
public static java.lang.CharSequence doubleToStringOLD(double value, java.lang.String javaString)
Internal method used for conversion of a double to a string- Parameters:
value
- the actual valuejavaString
- the result of converting the double to a string using the Java conventions. This value is adjusted as necessary to cater for the differences between the Java and XPath rules.- Returns:
- the value converted to a string, according to the XPath casting rules.
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zeros
static java.lang.String zeros(int n)
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getItemType
public ItemType getItemType(TypeHierarchy th)
Determine the data type of the expression- Specified by:
getItemType
in interfaceExpression
- Overrides:
getItemType
in classValue
- Parameters:
th
-- Returns:
- Type.DOUBLE
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negate
public NumericValue negate()
Negate the value- Specified by:
negate
in classNumericValue
- Returns:
- a value, of the same type as the original, with its sign inverted
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floor
public NumericValue floor()
Implement the XPath floor() function- Specified by:
floor
in classNumericValue
- Returns:
- a value, of the same type as that supplied, rounded towards minus infinity
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ceiling
public NumericValue ceiling()
Implement the XPath ceiling() function- Specified by:
ceiling
in classNumericValue
- Returns:
- a value, of the same type as that supplied, rounded towards plus infinity
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round
public NumericValue round()
Implement the XPath round() function- Specified by:
round
in classNumericValue
- Returns:
- a value, of the same type as that supplied, rounded towards the nearest whole number (0.5 rounded up)
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roundHalfToEven
public NumericValue roundHalfToEven(int scale)
Implement the XPath round-to-half-even() function- Specified by:
roundHalfToEven
in classNumericValue
- 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
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signum
public double signum()
Determine whether the value is negative, zero, or positive- Specified by:
signum
in classNumericValue
- Returns:
- -1 if negative, 0 if zero (including negative zero), +1 if positive, NaN if NaN
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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 classNumericValue
- Returns:
- true if the value is a whole number
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arithmetic
public NumericValue arithmetic(int operator, NumericValue other, XPathContext context) throws XPathException
Evaluate a binary arithmetic operator.- Specified by:
arithmetic
in classNumericValue
- Parameters:
operator
- the binary arithmetic operation to be performed. Uses the constants defined in the Tokenizer classother
- the other operand- Returns:
- the result of the arithmetic operation
- Throws:
XPathException
- if an arithmetic error occurs- See Also:
Tokenizer
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compareTo
public int compareTo(long other)
Compare the value to a long.- Specified by:
compareTo
in classNumericValue
- 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
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convertToJava
public java.lang.Object convertToJava(java.lang.Class target, XPathContext context) throws XPathException
Convert to Java object (for passing to external functions)- Overrides:
convertToJava
in classValue
- Throws:
XPathException
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printInternalForm
public static void printInternalForm(double d)
Diagnostic method
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