net.sf.saxon.value
Class DecimalValue

java.lang.Object
  extended bynet.sf.saxon.value.Value
      extended bynet.sf.saxon.value.AtomicValue
          extended bynet.sf.saxon.value.NumericValue
              extended bynet.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 BIG_DECIMAL_ONE
           
static java.math.BigDecimal BIG_DECIMAL_ONE_MILLION
           
static java.math.BigInteger BIG_INTEGER_TEN
           
static DecimalValue ONE
           
static DecimalValue ZERO
           
 
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.
static boolean castableAsDecimal(java.lang.CharSequence in)
          Test whether a string is castable to a decimal value
 NumericValue ceiling()
          Implement the XPath ceiling() function
 int compareTo(long other)
          Compare the value to a long
 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.CharSequence 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.lang.CharSequence getStringValueCS()
          Get the value of the item as a CharSequence.
 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 roundHalfToEven(int scale)
          Implement the XPath round-half-to-even() function
 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, getTypedValue, hasBuiltInType, iterate, process
 
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
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

BIG_DECIMAL_ONE

public static final java.math.BigDecimal BIG_DECIMAL_ONE

BIG_INTEGER_TEN

public static final java.math.BigInteger BIG_INTEGER_TEN

BIG_DECIMAL_ONE_MILLION

public static final java.math.BigDecimal BIG_DECIMAL_ONE_MILLION

ZERO

public static final DecimalValue ZERO

ONE

public static final DecimalValue ONE
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.

castableAsDecimal

public static boolean castableAsDecimal(java.lang.CharSequence in)
Test whether a string is castable to a decimal value


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 a ValidationErrorValue. The caller must check for this condition. No exception is thrown, instead the exception will be encapsulated within the ValidationErrorValue.

getStringValueCS

public java.lang.CharSequence getStringValueCS()
Get the value of the item as a CharSequence. This is in some cases more efficient than the version of the method that returns a String.

Specified by:
getStringValueCS in interface Item
Overrides:
getStringValueCS in class AtomicValue

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.CharSequence 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)

roundHalfToEven

public NumericValue roundHalfToEven(int scale)
Implement the XPath round-half-to-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, +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.

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

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