net.sf.saxon.value
Class IntegerValue

java.lang.Object
  extended by net.sf.saxon.value.Value<AtomicValue>
      extended by net.sf.saxon.value.AtomicValue
          extended by net.sf.saxon.value.NumericValue
              extended by net.sf.saxon.value.IntegerValue
All Implemented Interfaces:
Comparable, PullEvent, GroundedValue<AtomicValue>, Item<AtomicValue>, ValueRepresentation<AtomicValue>, ConversionResult
Direct Known Subclasses:
BigIntegerValue, Int64Value

public abstract class IntegerValue
extends NumericValue

This class represents the XPath built-in type xs:integer. It is used for all subtypes of xs:integer, other than user-defined subtypes. There are two implementations of IntegerValue: Int64Value, which accommodates values up to 2^63, and BigIntegerValue, which accommodates unlimited-length integers.


Field Summary
static Int64Value MAX_LONG
          IntegerValue representing the maximum value for a long
static Int64Value MIN_LONG
          IntegerValue representing the minimum value for a long
static Int64Value MINUS_ONE
          IntegerValue representing the value -1
static Int64Value PLUS_ONE
          IntegerValue representing the value +1
static Int64Value ZERO
          IntegerValue representing the value zero
 
Fields inherited from class net.sf.saxon.value.AtomicValue
typeLabel
 
Fields inherited from class net.sf.saxon.value.Value
INDETERMINATE_ORDERING
 
Fields inherited from interface net.sf.saxon.om.ValueRepresentation
EMPTY_VALUE_ARRAY
 
Constructor Summary
IntegerValue()
           
 
Method Summary
abstract  BigInteger asBigInteger()
          Get the value as a BigInteger
static ValidationFailure castableAsInteger(CharSequence input)
          Determine whether a string is castable as an integer
static boolean checkBigRange(BigInteger big, BuiltInAtomicType type)
          Check that a BigInteger is within the required range for a given integer subtype.
static boolean checkRange(long value, BuiltInAtomicType type)
          Check that a value is in range for the specified subtype of xs:integer
abstract  ValidationFailure convertToSubType(BuiltInAtomicType type, boolean validate)
          This class allows subtypes of xs:integer to be held, as well as xs:integer values.
abstract  NumericValue div(IntegerValue other)
          Divide by another integer
 BuiltInAtomicType getPrimitiveType()
          Determine the primitive type of the value.
abstract  IntegerValue idiv(IntegerValue other)
          Integer divide by another integer
 boolean isIdentical(Value v)
          Determine whether two atomic values are identical, as determined by XML Schema rules.
 boolean isWholeNumber()
          Determine whether the value is a whole number, that is, whether it compares equal to some integer
static IntegerValue makeIntegerValue(BigInteger value)
          Factory method: makes either an Int64Value or a BigIntegerValue depending on the value supplied
static ConversionResult makeIntegerValue(double value)
          Convert a double to an integer
static ConversionResult makeIntegerValue(DoubleValue doubleValue)
          Convert a double to an integer
abstract  IntegerValue minus(IntegerValue other)
          Subtract another integer
abstract  IntegerValue mod(IntegerValue other)
          Take modulo another integer
abstract  IntegerValue plus(IntegerValue other)
          Add another integer
protected static int signum(int i)
          Get the signum of an int
static ConversionResult stringToInteger(CharSequence s)
          Static factory method to convert strings to integers.
abstract  IntegerValue times(IntegerValue other)
          Multiply by another integer
abstract  ValidationFailure validateAgainstSubType(BuiltInAtomicType type)
          This class allows subtypes of xs:integer to be held, as well as xs:integer values.
 
Methods inherited from class net.sf.saxon.value.NumericValue
abs, ceiling, compareTo, compareTo, equals, floor, getDecimalValue, getDoubleValue, getFloatValue, getXPathComparable, hashCode, isInteger, longValue, negate, parseNumber, round, roundHalfToEven, signum, toString
 
Methods inherited from class net.sf.saxon.value.AtomicValue
asAtomic, checkPermittedContents, copyAsSubType, effectiveBooleanValue, getCardinality, getComponent, getItemType, getLength, getPrimitiveStringValue, getSchemaComparable, getStringValue, getStringValueCS, getTypedValue, getTypeLabel, isNaN, itemAt, iterate, process, setTypeLabel, subsequence
 
Methods inherited from class net.sf.saxon.value.Value
asItem, asItem, asIterator, asValue, convertToJava, fromItem, getCanonicalLexicalRepresentation, getIterator, getSequenceLength, reduce
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

MINUS_ONE

public static final Int64Value MINUS_ONE
IntegerValue representing the value -1


ZERO

public static final Int64Value ZERO
IntegerValue representing the value zero


PLUS_ONE

public static final Int64Value PLUS_ONE
IntegerValue representing the value +1


MAX_LONG

public static final Int64Value MAX_LONG
IntegerValue representing the maximum value for a long


MIN_LONG

public static final Int64Value MIN_LONG
IntegerValue representing the minimum value for a long

Constructor Detail

IntegerValue

public IntegerValue()
Method Detail

makeIntegerValue

public static IntegerValue makeIntegerValue(BigInteger value)
Factory method: makes either an Int64Value or a BigIntegerValue depending on the value supplied

Parameters:
value - the supplied integer value
Returns:
the value as a BigIntegerValue or Int64Value as appropriate

makeIntegerValue

public static ConversionResult makeIntegerValue(double value)
Convert a double to an integer

Parameters:
value - the double to be converted
Returns:
the result of the conversion, or the validation failure if the input is NaN or infinity

makeIntegerValue

public static ConversionResult makeIntegerValue(DoubleValue doubleValue)
Convert a double to an integer

Parameters:
doubleValue - the double to be converted
Returns:
the result of the conversion, or the validation failure if the input is NaN or infinity

convertToSubType

public abstract ValidationFailure convertToSubType(BuiltInAtomicType type,
                                                   boolean validate)
This class allows subtypes of xs:integer to be held, as well as xs:integer values. This method sets the required type label. Note that this method modifies the value in situ.

Parameters:
type - the subtype of integer required
validate - true if validation is required, false if the caller warrants that the value is valid for the subtype
Returns:
null if the operation succeeds, or a ValidationException if the value is out of range

validateAgainstSubType

public abstract ValidationFailure validateAgainstSubType(BuiltInAtomicType type)
This class allows subtypes of xs:integer to be held, as well as xs:integer values. This method sets the required type label. Note that this method modifies the value in situ.

Parameters:
type - the subtype of integer required
Returns:
null if the operation succeeds, or a ValidationException if the value is out of range

checkRange

public static boolean checkRange(long value,
                                 BuiltInAtomicType type)
Check that a value is in range for the specified subtype of xs:integer

Parameters:
value - the value to be checked
type - the required item type, a subtype of xs:integer
Returns:
true if successful, false if value is out of range for the subtype

checkBigRange

public static boolean checkBigRange(BigInteger big,
                                    BuiltInAtomicType type)
Check that a BigInteger is within the required range for a given integer subtype. This method is expensive, so it should not be used unless the BigInteger is outside the range of a long.

Parameters:
big - the supplied BigInteger
type - the derived type (a built-in restriction of xs:integer) to check the value against
Returns:
true if the value is within the range for the derived type

stringToInteger

public static ConversionResult stringToInteger(CharSequence s)
Static factory method to convert strings to integers.

Parameters:
s - CharSequence representing the string to be converted
Returns:
either an Int64Value or a BigIntegerValue representing the value of the String, or a ValidationFailure encapsulating an Exception if the value cannot be converted.

castableAsInteger

public static ValidationFailure castableAsInteger(CharSequence input)
Determine whether a string is castable as an integer

Parameters:
input - the string to be tested
Returns:
null if the string is castable to an integer, or a validation failure otherwise

getPrimitiveType

public BuiltInAtomicType getPrimitiveType()
Determine the primitive type of the value. This delivers the same answer as getItemType().getPrimitiveItemType(). The primitive types are the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration, and xs:untypedAtomic. For external objects, the result is AnyAtomicType.

Specified by:
getPrimitiveType in class AtomicValue
Returns:
the primitive type

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

plus

public abstract IntegerValue plus(IntegerValue other)
Add another integer

Parameters:
other - the other integer
Returns:
the result of the addition

minus

public abstract IntegerValue minus(IntegerValue other)
Subtract another integer

Parameters:
other - the other integer
Returns:
the result of the subtraction

times

public abstract IntegerValue times(IntegerValue other)
Multiply by another integer

Parameters:
other - the other integer
Returns:
the result of the multiplication

div

public abstract NumericValue div(IntegerValue other)
                          throws XPathException
Divide by another integer

Parameters:
other - the other integer
Returns:
the result of the division
Throws:
XPathException - if the other integer is zero

mod

public abstract IntegerValue mod(IntegerValue other)
                          throws XPathException
Take modulo another integer

Parameters:
other - the other integer
Returns:
the result of the modulo operation (the remainder)
Throws:
XPathException - if the other integer is zero

idiv

public abstract IntegerValue idiv(IntegerValue other)
                           throws XPathException
Integer divide by another integer

Parameters:
other - the other integer
Returns:
the result of the integer division
Throws:
XPathException - if the other integer is zero

asBigInteger

public abstract BigInteger asBigInteger()
Get the value as a BigInteger

Returns:
the value, as a BigInteger

signum

protected static int signum(int i)
Get the signum of an int

Parameters:
i - the int
Returns:
-1 if the integer is negative, 0 if it is zero, +1 if it is positive

isIdentical

public boolean isIdentical(Value v)
Determine whether two atomic values are identical, as determined by XML Schema rules. This is a stronger test than equality (even schema-equality); for example two dateTime values are not identical unless they are in the same timezone.

Note that even this check ignores the type annotation of the value. The integer 3 and the short 3 are considered identical, even though they are not fully interchangeable. "Identical" means the same point in the value space, regardless of type annotation.

NaN is identical to itself.

Overrides:
isIdentical in class AtomicValue
Parameters:
v - the other value to be compared with this one
Returns:
true if the two values are identical, false otherwise.


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.