Package net.sf.saxon.expr.instruct

Class GlobalParam

java.lang.Object

net.sf.saxon.expr.instruct.GeneralVariable

net.sf.saxon.expr.instruct.GlobalVariable

net.sf.saxon.expr.instruct.GlobalParam

All Implemented Interfaces:

java.io.Serializable, javax.xml.transform.SourceLocator, LocationProvider, SaxonLocator, Binding, Container, InstructionInfo, org.xml.sax.Locator

public final class GlobalParam
extends GlobalVariable

The compiled form of a global xsl:param element in an XSLT stylesheet or an external variable declared in the prolog of a Query.
The xsl:param element in XSLT has mandatory attribute name and optional attribute select. It can also be specified as required="yes" or required="no". In standard XQuery 1.0 external variables are always required, and no default value can be specified; but Saxon provides an extension pragma that allows a query to specify a default. XQuery 1.1 adds standard syntax for defining a default value.

See Also:

Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.expr.instruct.GeneralVariable

evaluationMode, referenceCount, requiredType, select, slotNumber, variableQName

Constructor Summary

Constructors

Constructor	Description
GlobalParam()

Method Summary

Modifier and Type	Method	Description
ValueRepresentation	evaluateVariable(XPathContext context)	Evaluate the variable
int	getInstructionNameCode()	Get the name of this instruction for diagnostic and tracing purposes

Methods inherited from interface net.sf.saxon.expr.Container

getLocationProvider

Methods inherited from class net.sf.saxon.expr.instruct.GeneralVariable

addReference, checkAgainstRequiredType, computeEvaluationMode, copy, explain, getCardinality, getColumnNumber, getEvaluationMode, getIntegerBoundsForVariable, getLineNumber, getLocalSlotNumber, getLocationId, getLocationProvider, getPublicId, getRequiredType, getSelectExpression, getSlotNumber, getSystemId, getSystemId, getVariableQName, init, isAssignable, isImplicitlyRequiredParam, isRequiredParam, isTunnelParam, iterateSubExpressions, optimize, replaceSubExpression, setAssignable, setContainer, setImplicitlyRequiredParam, setLocationId, setReferenceCount, setRequiredParam, setRequiredType, setSelectExpression, setSlotNumber, setTunnel, setVariableQName, simplify, typeCheck

Methods inherited from class net.sf.saxon.expr.instruct.GlobalVariable

actuallyEvaluate, getColumnNumber, getConstructType, getContainer, getContainerGranularity, getExecutable, getHostLanguage, getLineNumber, getObjectName, getProperties, getProperty, getSelectValue, isGlobal, isIndexedVariable, lookForCycles, setContainsLocals, setDependencies, setExecutable, setIndexedVariable

Methods inherited from interface net.sf.saxon.trace.InstructionInfo

getLineNumber, getSystemId

Methods inherited from interface net.sf.saxon.event.LocationProvider

getSystemId

Methods inherited from interface org.xml.sax.Locator

getColumnNumber, getPublicId

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getPublicId

Constructor Detail

GlobalParam

public GlobalParam()

Method Detail

getInstructionNameCode

public int getInstructionNameCode()

Get the name of this instruction for diagnostic and tracing purposes

Overrides:

getInstructionNameCode in class GeneralVariable

Returns:

the name of this instruction, as a name pool name code

evaluateVariable

public ValueRepresentation evaluateVariable(XPathContext context)
                                     throws XPathException

Evaluate the variable

Specified by:

evaluateVariable in interface Binding

Overrides:

evaluateVariable in class GlobalVariable

Parameters:

context - the XPath dynamic evaluation context

Returns:

the result of evaluating the variable

Throws:

XPathException - if an error occurs while evaluating the variable