net.sf.saxon.expr
Class IntegerRangeTest

java.lang.Object
  net.sf.saxon.expr.ComputedExpression
      net.sf.saxon.expr.IntegerRangeTest

All Implemented Interfaces:

Serializable, Expression

public class IntegerRangeTest
extends ComputedExpression

An IntegerRangeTest is an expression of the form E = N to M where E, N, and M are all expressions of type integer.

See Also:

Serialized Form

Field Summary

(package private) Expression	max
(package private) Expression	min
(package private) Expression	value

Fields inherited from class net.sf.saxon.expr.ComputedExpression

lineNumber, NO_ARGUMENTS, staticProperties

Constructor Summary

IntegerRangeTest(Expression value, Expression min, Expression max)
Construct a IntegerRangeTest

Method Summary

Expression	analyze(StaticContext env) Type-check the expression
int	computeCardinality() Determine the static cardinality
void	display(int level, NamePool pool) Display this instruction as an expression, for diagnostics
Item	evaluateItem(XPathContext c) Evaluate the expression
ItemType	getItemType() Get the data type of the items returned

Methods inherited from class net.sf.saxon.expr.ComputedExpression

computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, getSubExpressions, iterate, markTailFunctionCalls, promote, setLineNumber, simplify, typeError

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

value

Expression value

min

Expression min

max

Expression max

Constructor Detail

IntegerRangeTest

public IntegerRangeTest(Expression value,
                        Expression min,
                        Expression max)

Construct a IntegerRangeTest

Method Detail

analyze

public Expression analyze(StaticContext env)
                   throws XPathException

Type-check the expression

Parameters:

env - the static context of the expression

Returns:

the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations

Throws:

XPathException - if an error is discovered during this phase (typically a type error)

getItemType

public ItemType getItemType()

Get the data type of the items returned

Returns:

a value such as Type.STRING, Type.BOOLEAN, Type.NUMBER, Type.NODE, or Type.ITEM (meaning not known at compile time)

computeCardinality

public int computeCardinality()

Determine the static cardinality

Specified by:

computeCardinality in class ComputedExpression

evaluateItem

public Item evaluateItem(XPathContext c)
                  throws XPathException

Evaluate the expression

Specified by:

evaluateItem in interface Expression

Overrides:

evaluateItem in class ComputedExpression

Parameters:

c - The context in which the expression is to be evaluated

Returns:

the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence

Throws:

XPathException - if any dynamic error occurs evaluating the expression

display

public void display(int level,
                    NamePool pool)

Display this instruction as an expression, for diagnostics

Parameters:

level - indentation level for this expression