net.sf.saxon.value
Class IntegerValue

java.lang.Object
  net.sf.saxon.value.Value<AtomicValue>
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.NumericValue
              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.