net.sf.saxon.value
Class DecimalValue

java.lang.Object
  net.sf.saxon.value.Value
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.NumericValue
              net.sf.saxon.value.DecimalValue

All Implemented Interfaces:

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

public final class DecimalValue

extends NumericValue

A decimal value

See Also:

Serialized Form

Field Summary

static java.math.BigDecimal	ONE
static java.math.BigDecimal	ONE_MILLION
static java.math.BigInteger	TEN

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

EMPTY_CLASS_ARRAY

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

EMPTY_VALUE_ARRAY

Fields inherited from interface net.sf.saxon.expr.Expression

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

DecimalValue(java.math.BigDecimal value)
Constructor supplying a BigDecimal

DecimalValue(double in)
Constructor supplying a double

DecimalValue(long in)
Constructor supplying a long integer

Method Summary

NumericValue	arithmetic(int operator, NumericValue other, XPathContext context) Evaluate a binary arithmetic operator.
NumericValue	ceiling() Implement the XPath ceiling() function
int	compareTo(java.lang.Object other) Compare the value to another numeric value
AtomicValue	convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context) Convert to target data type
java.lang.Object	convertToJava(java.lang.Class target, XPathContext context) Convert to Java object (for passing to external functions)
static java.lang.String	decimalToString(java.math.BigDecimal value)
boolean	effectiveBooleanValue(XPathContext context) Get the effective boolean value of the value
NumericValue	floor() Implement the XPath floor() function
ItemType	getItemType(TypeHierarchy th) Determine the data type of the expression
java.lang.String	getStringValue() Get the value as a String
java.math.BigDecimal	getValue() Get the value
int	hashCode() Get the hashCode.
boolean	isWholeNumber() Determine whether the value is a whole number, that is, whether it compares equal to some integer
static AtomicValue	makeDecimalValue(java.lang.CharSequence in, boolean validate) Factory method to construct a DecimalValue from a string
NumericValue	negate() Negate the value
NumericValue	round() Implement the XPath round() function
NumericValue	roundToHalfEven(int scale) Implement the XPath round-to-half-even() function
boolean	schemaEquals(Value obj) Compare two values for equality.
double	signum() Determine whether the value is negative, zero, or positive

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

equals, getDoubleValue, isInteger, isNaN, longValue, parseNumber, promote, toString

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

checkPermittedContents, convert, convert, display, evaluateAsString, evaluateItem, getCardinality, getComponent, getImplementationMethod, getLength, getPrimitiveValue, getStringValueCS, getTypedValue, hasBuiltInType, iterate, process

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

asItem, asIterator, asValue, collapseWhitespace, convert, convertJavaObjectToXPath, getDependencies, getIterator, getParentExpression, getSpecialProperties, itemAt, iterateSubExpressions, makeQNameValue, normalizeWhitespace, optimize, promote, reduce, simplify, stringToNumber, trimWhitespace, typeCheck

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ONE

public static final java.math.BigDecimal ONE

TEN

public static final java.math.BigInteger TEN

ONE_MILLION

public static final java.math.BigDecimal ONE_MILLION

Constructor Detail

DecimalValue

public DecimalValue(java.math.BigDecimal value)

Constructor supplying a BigDecimal

Parameters:

value - the value of the DecimalValue

DecimalValue

public DecimalValue(double in)
             throws ValidationException

Constructor supplying a double

Parameters:

in - the value of the DecimalValue

DecimalValue

public DecimalValue(long in)

Constructor supplying a long integer

Parameters:

in - the value of the DecimalValue

Method Detail

makeDecimalValue

public static AtomicValue makeDecimalValue(java.lang.CharSequence in,
                                           boolean validate)

Factory method to construct a DecimalValue from a string

Parameters:

in - the value of the DecimalValue

validate - true if validation is required; false if the caller knows that the value is valid

Returns:

the required DecimalValue if the input is valid, or an ErrorValue encapsulating the error message if not.

getValue

public java.math.BigDecimal getValue()

Get the value

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()

effectiveBooleanValue

public boolean effectiveBooleanValue(XPathContext context)

Description copied from class: AtomicValue

Get the effective boolean value of the value

Specified by:

effectiveBooleanValue in interface Expression

Overrides:

effectiveBooleanValue in class AtomicValue

Parameters:

context - the evaluation context (not used in this implementation)

Returns:

true, unless the value is boolean false, numeric zero, or zero-length string

convertPrimitive

public AtomicValue convertPrimitive(BuiltInAtomicType requiredType,
                                    boolean validate,
                                    XPathContext context)

Convert to target data type

Specified by:

convertPrimitive in class AtomicValue

Parameters:

requiredType - type code of the required atomic type

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.

context - The conversion context to be used. This is required at present only when converting to a date or time: it provides the implicit timezone.

Returns:

the result of the conversion, if successful. If unsuccessful, the value returned will be an ErrorValue. The caller must check for this condition. No exception is thrown, instead the exception will be encapsulated within the ErrorValue.

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

decimalToString

public static java.lang.String decimalToString(java.math.BigDecimal value)

getItemType

public ItemType getItemType(TypeHierarchy th)

Determine the data type of the expression

Specified by:

getItemType in interface Expression

Overrides:

getItemType in class Value

Parameters:

th -

Returns:

Type.DECIMAL

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

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, +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

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

compareTo

public int compareTo(java.lang.Object other)

Compare the value to another numeric value

Specified by:

compareTo in interface java.lang.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.

schemaEquals

public boolean schemaEquals(Value obj)

Compare two values for equality. This supports identity constraints in XML Schema, which allow list-valued elements and attributes to participate in key and uniqueness constraints. This method returns false if any error occurs during the comparison, or if any of the items in either sequence is a node rather than an atomic value. The default implementation of schemaEquals() is the same as equals(), but subclasses can override this.

Overrides:

schemaEquals in class AtomicValue

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 class Value

Throws:

XPathException