net.sf.saxon.value
Class IntegerRange

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

All Implemented Interfaces:

Expression, java.io.Serializable, 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

Fields inherited from interface net.sf.saxon.expr.Expression

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

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

EMPTY_VALUE_ARRAY

Constructor Summary

IntegerRange(long start, long end)

Method Summary

void	display(int level, NamePool pool, java.io.PrintStream out) Diagnostic display of the expression
int	getCardinality() Determine the cardinality
long	getEnd()
int	getImplementationMethod() An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
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()
Item	itemAt(int n) Get the n'th item in the sequence (starting from 0).
SequenceIterator	iterate(XPathContext context) Return an Iterator to iterate over the values of a sequence.

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

asItem, asIterator, asValue, checkPermittedContents, collapseWhitespace, convert, convertJavaObjectToXPath, convertToJava, effectiveBooleanValue, equals, evaluateAsString, evaluateItem, getDependencies, getIterator, getParentExpression, getSpecialProperties, getStringValue, hashCode, iterateSubExpressions, makeQNameValue, normalizeWhitespace, optimize, process, promote, reduce, schemaEquals, simplify, stringToNumber, toString, trimWhitespace, typeCheck

Methods inherited from class java.lang.Object

clone, finalize, 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)

Method Detail

getStart

public long getStart()

getEnd

public long getEnd()

getImplementationMethod

public int getImplementationMethod()

An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). This method indicates which of these methods is provided directly. The other methods will always be available indirectly, using an implementation that relies on one of the other methods.

iterate

public SequenceIterator iterate(XPathContext context)
                         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.

Parameters:

context - supplies the context for evaluation

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

Specified by:

getItemType in interface Expression

Overrides:

getItemType in class Value

Parameters:

th -

Returns:

AnyItemType (not known)

getCardinality

public int getCardinality()

Determine the cardinality

Specified by:

getCardinality in interface Expression

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

Throws:

XPathException

getLength

public int getLength()
              throws XPathException

Get the length of the sequence

Overrides:

getLength in class Value

Throws:

XPathException

display

public void display(int level,
                    NamePool pool,
                    java.io.PrintStream out)

Diagnostic display of the expression

Specified by:

display in interface Expression

Overrides:

display in class Value