Package net.sf.saxon.expr.instruct

Class GlobalParam

java.lang.Object

net.sf.saxon.expr.instruct.Actor

net.sf.saxon.expr.instruct.GlobalVariable

net.sf.saxon.expr.instruct.GlobalParam

All Implemented Interfaces:

SourceLocator, Binding, ContextOriginator, ExpressionOwner, Locatable, Declaration, Location, Traceable, TraceableComponent, 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.

Field Summary

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

references

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

body

Constructor Summary

Constructors

Constructor	Description
GlobalParam()

Method Summary

Modifier and Type	Method	Description
GroundedValue	evaluateVariable(XPathContext context)	Evaluate the variable
GroundedValue	evaluateVariable(XPathContext context, Component target)	Evaluate the variable
protected String	getFlags()
String	getTracingTag()	Get a string used to identify this kind of component when used in tracing output
boolean	isImplicitlyRequiredParam()	Ask whether this variable represents a required parameter
void	setImplicitlyRequiredParam(boolean requiredParam)	Indicate that this parameter is implicitly required, because the default value does not match the type

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

actuallyEvaluate, addReference, checkCircularity, compile, countReferences, export, gatherProperties, getBinderySlotNumber, getDescription, getHostLanguage, getIntegerBoundsForVariable, getLocalSlotNumber, getObjectName, getOriginalVariable, getProperty, getRequiredType, getSelectValue, getSymbolicName, getUltimateOriginalVariable, getVariableQName, init, isAssignable, isGlobal, isIndexedVariable, isPrivate, isRequiredParam, isStatic, isUnused, iterateReferences, lookForCycles, registerReference, setAssignable, setBinderySlotNumber, setContainsLocals, setIndexedVariable, setOriginalVariable, setPrivate, setRequiredParam, setRequiredType, setStatic, setUnused, setVariableQName, typeCheck

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

allocateAllBindingSlots, allocateBindingSlotsRecursive, getBody, getChildExpression, getColumnNumber, getComponentName, getDeclaredVisibility, getDeclaringComponent, getLineNumber, getLocation, getPackageData, getPublicId, getRetainedStaticContext, getStackFrameMap, getSystemId, isExportable, makeDeclaringComponent, obtainDeclaringComponent, process, saveLocation, setBody, setChildExpression, setColumnNumber, setDeclaredVisibility, setDeclaringComponent, setLineNumber, setPackageData, setRetainedStaticContext, setStackFrameMap, setSystemId

Methods inherited from class java.lang.Object

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

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

getLocation

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

getBody, setBody

Constructor Details

GlobalParam

public GlobalParam()

Method Details

setImplicitlyRequiredParam

public void setImplicitlyRequiredParam(boolean requiredParam)

Indicate that this parameter is implicitly required, because the default value does not match the type

Parameters:

requiredParam - true if this is a required parameter

isImplicitlyRequiredParam

public boolean isImplicitlyRequiredParam()

Ask whether this variable represents a required parameter

Returns:

true if this variable represents a required parameter

getTracingTag

public String getTracingTag()

Description copied from class: Actor

Get a string used to identify this kind of component when used in tracing output

Specified by:

getTracingTag in interface TraceableComponent

Overrides:

getTracingTag in class GlobalVariable

Returns:

a diagnostic string used to identify the component when tracing

evaluateVariable

public GroundedValue evaluateVariable(XPathContext context,
 Component target)
                               throws XPathException

Evaluate the variable

Overrides:

evaluateVariable in class GlobalVariable

Parameters:

context - the XPath dynamic context

target - the component representing this variable (in the context of a package where it is used)

Returns:

the value of the variable

Throws:

XPathException - if evaluation of the variable fails with a dynamic error

evaluateVariable

public GroundedValue 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

getFlags

protected String getFlags()

Overrides:

getFlags in class GlobalVariable