net.sf.saxon.value
Class IntegerValue

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.IntegerValue
All Implemented Interfaces:
Comparable, Expression, Item, Serializable

public final class IntegerValue
extends NumericValue

An integer value: note this is a subtype of decimal in XML Schema, not a primitive type. This class also supports the built-in subtypes of xs:integer. Actually supports a value in the range permitted by a Java "long"

See Also:
Serialized Form

Field Summary
static IntegerValue MINUS_ONE
          IntegerValue representing the value -1
static IntegerValue PLUS_ONE
          IntegerValue representing the value +1
(package private) static long[] ranges
          Static data identifying the min and max values for each built-in subtype of xs:integer
static IntegerValue ZERO
          IntegerValue representing the value zero
 
Constructor Summary
IntegerValue(long value)
          Constructor supplying a double
IntegerValue(long val, ItemType type)
          Constructor for a subtype, supplying an integer
 
Method Summary
 NumericValue arithmetic(int operator, NumericValue other)
          Evaluate a binary arithmetic operator.
 long asLong()
          Return the numeric value as a Java long.
 NumericValue ceiling()
          Implement the XPath ceiling() function
 int compareTo(Object other)
          Compare the value to another numeric value
 int conversionPreference(Class required)
          Get conversion preference for this value to a Java class.
 AtomicValue convert(int requiredType)
          Convert to target data type
 Object convertToJava(Class target)
          Convert to Java object (for passing to external functions)
 void display(int level, NamePool pool)
          Diagnostic print of expression structure
 boolean effectiveBooleanValue(XPathContext context)
          Return the effective boolean value of this integer
 NumericValue floor()
          Implement the XPath floor() function
 ItemType getItemType()
          Determine the data type of the expression
 String getStringValue()
          Get the value as a String
 long 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
 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
asDouble, equals, isNaN, promote, toString
 
Methods inherited from class net.sf.saxon.value.AtomicValue
convert, convert, evaluateAsString, evaluateItem, getCardinality, getComponent, getPrimitiveValue, getTypedValue, iterate
 
Methods inherited from class net.sf.saxon.value.Value
analyze, asItem, asValue, collapseWhitespace, getDependencies, getSpecialProperties, getSubExpressions, inverse, normalizeWhitespace, promote, simplify, stringToInteger, stringToNumber, trimWhitespace
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

MINUS_ONE

public static final IntegerValue MINUS_ONE
IntegerValue representing the value -1


ZERO

public static final IntegerValue ZERO
IntegerValue representing the value zero


PLUS_ONE

public static final IntegerValue PLUS_ONE
IntegerValue representing the value +1


ranges

static long[] ranges
Static data identifying the min and max values for each built-in subtype of xs:integer

Constructor Detail

IntegerValue

public IntegerValue(long value)
Constructor supplying a double

Parameters:
value - the value of the IntegerValue

IntegerValue

public IntegerValue(long val,
                    ItemType type)
             throws XPathException
Constructor for a subtype, supplying an integer

Parameters:
val - The supplied value, as an integer
type - the required item type, a subtype of xs:integer
Throws:
XPathException - if the supplied value is out of range for the target type
Method Detail

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()

getValue

public long getValue()
Get the value

Returns:
the value of the xs:integer, as a Java long

asLong

public long asLong()
Description copied from class: NumericValue
Return the numeric value as a Java long.

Overrides:
asLong in class NumericValue
Returns:
the numeric value as a Java long. This performs truncation towards zero.

effectiveBooleanValue

public boolean effectiveBooleanValue(XPathContext context)
Return the effective boolean value of this integer

Specified by:
effectiveBooleanValue in interface Expression
Overrides:
effectiveBooleanValue in class AtomicValue
Parameters:
context - The dynamic evaluation context; ignored in this implementation of the method
Returns:
false if the integer is zero, otherwise true

compareTo

public int compareTo(Object other)
Compare the value to another numeric value

Specified by:
compareTo in interface Comparable
Overrides:
compareTo in class NumericValue
Parameters:
other - the numeric value to be compared to this value
Returns:
-1 if this value is less than the other, 0 if they are equal, +1 if this value is greater

convert

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

Specified by:
convert in class AtomicValue
Parameters:
requiredType - an integer identifying the required atomic type
Returns:
an AtomicValue, a value of the required type
Throws:
XPathException - if the conversion is not possible

getStringValue

public String getStringValue()
Get the value as a String

Returns:
a String representation of the value

negate

public NumericValue negate()
Negate the value

Specified by:
negate in class NumericValue
Returns:
the result of inverting the sign of the value

floor

public NumericValue floor()
Implement the XPath floor() function

Specified by:
floor in class NumericValue
Returns:
the integer value, unchanged

ceiling

public NumericValue ceiling()
Implement the XPath ceiling() function

Specified by:
ceiling in class NumericValue
Returns:
the integer value, unchanged

round

public NumericValue round()
Implement the XPath round() function

Specified by:
round in class NumericValue
Returns:
the integer value, unchanged

roundToHalfEven

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

Specified by:
roundToHalfEven in class NumericValue
Parameters:
scale - number of digits required after the decimal point; the value -2 (for example) means round to a multiple of 100
Returns:
if the scale is >=0, return this value unchanged. Otherwise round it to a multiple of 10**-scale

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:
always true for this implementation

arithmetic

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

Specified by:
arithmetic in class NumericValue
Parameters:
operator - the operator to be applied, identified by a constant in the Tokenizer class
other - the other operand of the arithmetic expression
Returns:
the result of performing the arithmetic operation
Throws:
XPathException - if an arithmetic failure occurs, e.g. divide by zero
See Also:
Tokenizer

getItemType

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

Returns:
the actual data type

conversionPreference

public int conversionPreference(Class required)
Get conversion preference for this value to a Java class.

Overrides:
conversionPreference in class AtomicValue
Parameters:
required - the Java class to which conversion is required
Returns:
the conversion preference. A low result indicates higher preference.

convertToJava

public Object convertToJava(Class target)
                     throws XPathException
Convert to Java object (for passing to external functions)

Overrides:
convertToJava in class AtomicValue
Parameters:
target - The Java class to which conversion is required
Returns:
the Java object that results from the conversion; always an instance of the target class
Throws:
XPathException - if conversion is not possible, or fails

display

public void display(int level,
                    NamePool pool)
Diagnostic print of expression structure

Parameters:
level - indentation level of the output