net.sf.saxon.instruct
Class GlobalVariable

java.lang.Object
  net.sf.saxon.expr.ComputedExpression
      net.sf.saxon.instruct.Instruction
          net.sf.saxon.instruct.GeneralVariable
              net.sf.saxon.instruct.GlobalVariable

All Implemented Interfaces:

Binding, Container, Expression, InstructionInfoProvider, java.io.Serializable, javax.xml.transform.SourceLocator, TailCallReturner

Direct Known Subclasses:

GlobalParam

public class GlobalVariable

extends GeneralVariable

implements Container

A compiled global variable in a stylesheet or query.

See Also:

Serialized Form

Field Summary

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

nameCode, referenceCount

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

locationId, staticProperties

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

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

GlobalVariable()

Method Summary

ValueRepresentation	evaluateVariable(XPathContext context) Evaluate the variable
Executable	getExecutable() Get the Executable (representing a complete stylesheet or query) of which this Container forms part
int	getHostLanguage() Get the host language (XSLT, XQuery, XPath) used to implement the code in this container
InstructionInfo	getInstructionInfo() Get InstructionInfo for this expression
ValueRepresentation	getSelectValue(XPathContext context) Evaluate the variable.
boolean	isGlobal() Indicate whether the binding is local or global.
void	lookForCycles(java.util.Stack referees) Check for cycles in this variable definition
TailCall	processLeavingTail(XPathContext context) Process the variable declaration
void	setContainsLocals(SlotManager map)
void	setExecutable(Executable executable)
void	setHostLanguage(int language)

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

display, evaluateItem, getCardinality, getInstructionNameCode, getItemType, getLocalSlotNumber, getNameCode, getRequiredType, getSelectExpression, getSlotNumber, getVariableFingerprint, getVariableName, init, isAssignable, isRequiredParam, isTunnelParam, iterate, iterateSubExpressions, optimize, promoteInst, setAssignable, setNameCode, setReferenceCount, setRequiredParam, setRequiredType, setSelectExpression, setSlotNumber, setTunnel, setVariableName, simplify, typeCheck

Methods inherited from class net.sf.saxon.instruct.Instruction

appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, createsNewNodes, dynamicError, evaluateAsString, getImplementationMethod, getSourceLocator, isXSLT, process, promote

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

adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, dynamicError, effectiveBooleanValue, getColumnNumber, getConstructType, getDependencies, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, suppressValidation, typeError, typeError

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.Container

getLocationProvider

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getLineNumber, getPublicId, getSystemId

Constructor Detail

GlobalVariable

public GlobalVariable()

Method Detail

getExecutable

public Executable getExecutable()

Description copied from interface: Container

Get the Executable (representing a complete stylesheet or query) of which this Container forms part

Specified by:

getExecutable in interface Container

Overrides:

getExecutable in class ComputedExpression

setExecutable

public void setExecutable(Executable executable)

setHostLanguage

public void setHostLanguage(int language)

getHostLanguage

public int getHostLanguage()

Description copied from interface: Container

Get the host language (XSLT, XQuery, XPath) used to implement the code in this container

Specified by:

getHostLanguage in interface Container

Overrides:

getHostLanguage in class ComputedExpression

Returns:

typically Configuration.XSLT or Configuration.XQUERY

setContainsLocals

public void setContainsLocals(SlotManager map)

isGlobal

public boolean isGlobal()

Description copied from interface: Binding

Indicate whether the binding is local or global. A global binding is one that has a fixed value for the life of a query or transformation; any other binding is local.

Specified by:

isGlobal in interface Binding

Overrides:

isGlobal in class GeneralVariable

lookForCycles

public void lookForCycles(java.util.Stack referees)
                   throws StaticError

Check for cycles in this variable definition

Parameters:

referees - the calls leading up to this one; it's an error if this variable is on the stack, because that means it calls itself directly or indirectly. The stack may contain variable definitions (GlobalVariable objects) and user-defined functions (UserFunction objects). It will never contain the same object more than once.

Throws:

StaticError

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws XPathException

Process the variable declaration

Specified by:

processLeavingTail in interface TailCallReturner

Specified by:

processLeavingTail in class Instruction

Parameters:

context - The dynamic context of the transformation, giving access to the current node, the current variables, etc.

Returns:

null if the instruction has completed execution; or a TailCall indicating a function call or template call that is delegated to the caller, to be made after the stack has been unwound so as to save stack space.

Throws:

XPathException

getSelectValue

public ValueRepresentation getSelectValue(XPathContext context)
                                   throws XPathException

Evaluate the variable. That is, get the value of the select expression if present or the content of the element otherwise, either as a tree or as a sequence

Overrides:

getSelectValue in class GeneralVariable

Throws:

XPathException

evaluateVariable

public ValueRepresentation evaluateVariable(XPathContext context)
                                     throws XPathException

Evaluate the variable

Specified by:

evaluateVariable in interface Binding

Throws:

XPathException

getInstructionInfo

public InstructionInfo getInstructionInfo()

Get InstructionInfo for this expression

Specified by:

getInstructionInfo in interface InstructionInfoProvider

Overrides:

getInstructionInfo in class Instruction