net.sf.saxon.instruct
Class WithParam

java.lang.Object
  extended by net.sf.saxon.expr.Expression
      extended by net.sf.saxon.instruct.Instruction
          extended by net.sf.saxon.instruct.GeneralVariable
              extended by net.sf.saxon.instruct.WithParam
All Implemented Interfaces:
Serializable, SourceLocator, Binding, EvaluableItem, SequenceIterable, TailCallReturner, InstructionInfoProvider

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.Expression
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
 
Constructor Summary
WithParam()
           
 
Method Summary
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)
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(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
static void simplify(WithParam[] params, ExpressionVisitor visitor)
           
static void typeCheck(WithParam[] params, ExpressionVisitor visitor, ItemType contextItemType)
           
 
Methods inherited from class net.sf.saxon.instruct.GeneralVariable
copy, evaluateItem, explain, getCardinality, getEvaluationMode, getItemType, getLocalSlotNumber, getRequiredType, getSelectExpression, getSelectValue, getSlotNumber, getVariableQName, init, isAssignable, isGlobal, isImplicitlyRequiredParam, isRequiredParam, isTunnelParam, iterate, iterateSubExpressions, optimize, replaceSubExpression, setAssignable, setImplicitlyRequiredParam, setReferenceCount, setRequiredParam, setRequiredType, setSelectExpression, setSlotNumber, setTunnel, setVariableQName, simplify, typeCheck
 
Methods inherited from class net.sf.saxon.instruct.Instruction
computeCardinality, computeSpecialProperties, createsNewNodes, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, isXSLT, process, promote
 
Methods inherited from class net.sf.saxon.expr.Expression
addToPathMap, adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, display, doPromotion, effectiveBooleanValue, explain, findParentOf, getColumnNumber, getContainer, getDependencies, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, iterateEvents, markTailFunctionCalls, setContainer, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toString
 
Methods inherited from class java.lang.Object
equals, 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

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(WithParam[] params,
                                 PromotionOffer offer)
                          throws XPathException
Promote the expressions in a set of with-param elements. This is a convenience method for use by subclasses.

Throws:
XPathException

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


Copyright (C) Michael H. Kay. All rights reserved.