net.sf.saxon.expr.instruct
Class WithParam

java.lang.Object
  net.sf.saxon.expr.Expression
      net.sf.saxon.expr.instruct.Instruction
          net.sf.saxon.expr.instruct.GeneralVariable
              net.sf.saxon.expr.instruct.WithParam

All Implemented Interfaces:

Serializable, SourceLocator, LocationProvider, SaxonLocator, Binding, EvaluableItem, TailCallReturner, SequenceIterable, InstructionInfo, Locator

public class WithParam
extends GeneralVariable

An instruction derived from a xsl:with-param element in the stylesheet.

See Also:

Serialized Form

Field Summary

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

evaluationMode, referenceCount, slotNumber, variableQName

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

EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, PUSH_SELECTION, staticProperties, WATCH_METHOD

Constructor Summary

WithParam()

Method Summary

static WithParam[]	copy(WithParam[] params) Copy a set of parameters
static void	displayExpressions(WithParam[] params, ExpressionPresenter out) DIsplay the parameter expressions
ValueRepresentation	evaluateVariable(XPathContext context) Evaluate the variable (method exists only to satisfy the interface)
int	getInstructionNameCode() Get the name of this instruction (that is xsl:variable, xsl:param etc) for diagnostics
int	getParameterId() Get the parameter id, which is essentially an alias for the parameter name, unique within a stylesheet
static void	getXPathExpressions(WithParam[] params, List list) Get the XPath expressions used in an array of WithParam parameters (add them to the supplied list)
boolean	isTypeChecked() Ask whether static type checking has been done
static void	optimize(ExpressionVisitor visitor, WithParam[] params, ItemType contextItemType)
TailCall	processLeavingTail(XPathContext context) ProcessLeavingTail: called to do the real work of this instruction.
static void	promoteParams(Expression parent, WithParam[] params, PromotionOffer offer) Promote the expressions in a set of with-param elements.
static boolean	replaceXPathExpression(WithParam[] params, Expression original, Expression replacement) Replace a subexpression
void	setParameterId(int id) Allocate a number which is essentially an alias for the parameter name, unique within a stylesheet
void	setTypeChecked(boolean checked) Say whether this parameter will have been typechecked by the caller to ensure it satisfies the required type, in which case the callee need not do a dynamic type check
static void	simplify(WithParam[] params, ExpressionVisitor visitor)
static void	typeCheck(WithParam[] params, ExpressionVisitor visitor, ItemType contextItemType)

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

copy, evaluateItem, explain, getCardinality, getEvaluationMode, getItemType, getLocalSlotNumber, getRequiredType, getSelectExpression, getSelectValue, getSlotNumber, getVariableQName, init, isAssignable, isGlobal, isImplicitlyRequiredParam, isRequiredParam, isTunnelParam, iterate, iterateSubExpressions, optimize, promoteInst, replaceSubExpression, setAssignable, setImplicitlyRequiredParam, setReferenceCount, setRequiredParam, setRequiredType, setSelectExpression, setSlotNumber, setTunnel, setVariableQName, simplify, typeCheck

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

assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, createsNewNodes, dynamicError, evaluateAsString, getConstructType, getExpressionName, getImplementationMethod, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, process, promote

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

addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getColumnNumber, getColumnNumber, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, iterateSameFocusSubExpressions, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toString, typeError

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getLineNumber, getPublicId, getSystemId

Constructor Detail

WithParam

public WithParam()

Method Detail

setParameterId

public void setParameterId(int id)

Allocate a number which is essentially an alias for the parameter name, unique within a stylesheet

Parameters:

id - the parameter id

setTypeChecked

public void setTypeChecked(boolean checked)

Say whether this parameter will have been typechecked by the caller to ensure it satisfies the required type, in which case the callee need not do a dynamic type check

Parameters:

checked - true if the caller has done static type checking against the required type

getParameterId

public int getParameterId()

Get the parameter id, which is essentially an alias for the parameter name, unique within a stylesheet

Returns:

the parameter id

getInstructionNameCode

public int getInstructionNameCode()

Description copied from class: GeneralVariable

Get the name of this instruction (that is xsl:variable, xsl:param etc) for diagnostics

Overrides:

getInstructionNameCode in class GeneralVariable

Returns:

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

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws XPathException

Description copied from class: Instruction

ProcessLeavingTail: called to do the real work of this instruction. This method must be implemented in each subclass. The results of the instruction are written to the current Receiver, which can be obtained via the Controller.

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

simplify

public static void simplify(WithParam[] params,
                            ExpressionVisitor visitor)
                     throws XPathException

Throws:

XPathException

typeCheck

public static void typeCheck(WithParam[] params,
                             ExpressionVisitor visitor,
                             ItemType contextItemType)
                      throws XPathException

Throws:

XPathException

optimize

public static void optimize(ExpressionVisitor visitor,
                            WithParam[] params,
                            ItemType contextItemType)
                     throws XPathException

Throws:

XPathException

promoteParams

public static void promoteParams(Expression parent,
                                 WithParam[] params,
                                 PromotionOffer offer)
                          throws XPathException

Promote the expressions in a set of with-param elements. This is a convenience method for use by containing instructions.

Throws:

XPathException

copy

public static WithParam[] copy(WithParam[] params)

Copy a set of parameters

Parameters:

params - the parameters to be copied

Returns:

the resulting copy

getXPathExpressions

public static void getXPathExpressions(WithParam[] params,
                                       List list)

Get the XPath expressions used in an array of WithParam parameters (add them to the supplied list)

displayExpressions

public static void displayExpressions(WithParam[] params,
                                      ExpressionPresenter out)

DIsplay the parameter expressions

replaceXPathExpression

public static boolean replaceXPathExpression(WithParam[] params,
                                             Expression original,
                                             Expression replacement)

Replace a subexpression

evaluateVariable

public ValueRepresentation evaluateVariable(XPathContext context)
                                     throws XPathException

Evaluate the variable (method exists only to satisfy the interface)

Parameters:

context - the XPath dynamic evaluation context

Returns:

the result of evaluating the variable

Throws:

XPathException

isTypeChecked

public boolean isTypeChecked()

Ask whether static type checking has been done

Returns:

true if the caller has done static type checking against the type required by the callee