net.sf.saxon.value
Class IntegerRange

java.lang.Object
  net.sf.saxon.value.Value
      net.sf.saxon.value.IntegerRange

All Implemented Interfaces:

Serializable, Comparable, SequenceIterable, ValueRepresentation

public class IntegerRange
extends Value

This class represents a sequence of consecutive ascending integers, for example 1 to 50. The integers must be within the range of a Java long.

See Also:

Serialized Form

Field Summary

long	end
long	start

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

EMPTY_CLASS_ARRAY, INDETERMINATE_ORDERING

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

EMPTY_VALUE_ARRAY

Constructor Summary

IntegerRange(long start, long end)
Construct an integer range expression

Method Summary

int	getCardinality() Determine the cardinality
long	getEnd() Get the last integer in the sequence (inclusive)
ItemType	getItemType(TypeHierarchy th) Determine the data type of the items in the expression, if possible
int	getLength() Get the length of the sequence
long	getStart() Get the first integer in the sequence (inclusive)
boolean	isMultiValued() Determine whether the value is multivalued, that is, whether it is a sequence that potentially contains more than one item
Item	itemAt(int n) Get the n'th item in the sequence (starting from 0).
SequenceIterator	iterate() Return an Iterator to iterate over the values of a sequence.

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

asItem, asItem, asIterator, asValue, checkPermittedContents, compareTo, convert, convertJavaObjectToXPath, convertToJava, effectiveBooleanValue, equals, fromItem, getCanonicalLexicalRepresentation, getIterator, getSchemaComparable, getStringValue, getStringValueCS, hashCode, iterate, makeQNameValue, process, reduce, stringToNumber, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

start

public long start

end

public long end

Constructor Detail

IntegerRange

public IntegerRange(long start,
                    long end)

Construct an integer range expression

Parameters:

start - the first integer in the sequence (inclusive)

end - the last integer in the sequence (inclusive). Must be >= start

Method Detail

isMultiValued

public boolean isMultiValued()

Determine whether the value is multivalued, that is, whether it is a sequence that potentially contains more than one item

Specified by:

isMultiValued in class Value

Returns:

true if the value might contain more than one item, false if it definitely contains zero or one items

getStart

public long getStart()

Get the first integer in the sequence (inclusive)

Returns:

the first integer in the sequence (inclusive)

getEnd

public long getEnd()

Get the last integer in the sequence (inclusive)

Returns:

the last integer in the sequence (inclusive)

iterate

public SequenceIterator iterate()
                         throws XPathException

Return an Iterator to iterate over the values of a sequence. The value of every expression can be regarded as a sequence, so this method is supported for all expressions. This default implementation handles iteration for expressions that return singleton values: for non-singleton expressions, the subclass must provide its own implementation.

Specified by:

iterate in class Value

Returns:

a SequenceIterator that can be used to iterate over the result of the expression

Throws:

XPathException - if any dynamic error occurs evaluating the expression

getItemType

public ItemType getItemType(TypeHierarchy th)

Determine the data type of the items in the expression, if possible

Overrides:

getItemType in class Value

Parameters:

th -

Returns:

AnyItemType (not known)

getCardinality

public int getCardinality()

Determine the cardinality

Overrides:

getCardinality in class Value

itemAt

public Item itemAt(int n)
            throws XPathException

Get the n'th item in the sequence (starting from 0). This is defined for all Values, but its real benefits come for a sequence Value stored extensionally (or for a MemoClosure, once all the values have been read)

Overrides:

itemAt in class Value

Parameters:

n - position of the required item, counting from zero.

Returns:

the n'th item in the sequence, where the first item in the sequence is numbered zero. If n is negative or >= the length of the sequence, returns null.

Throws:

XPathException

getLength

public int getLength()
              throws XPathException

Get the length of the sequence

Overrides:

getLength in class Value

Throws:

XPathException