## net.sf.saxon.instruct
Class LocalParam

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

All Implemented Interfaces:
  Serializable, SourceLocator, Binding, Container, EvaluableItem, SequenceIterable, TailCallReturner, InstructionInfoProvider

    public final class LocalParam

extends GeneralVariable

The compiled form of an xsl:param element in the stylesheet or an external variable in 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 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.

See Also:
  Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.expr.Expression
`EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD`

Constructor Summary
`LocalParam()`

Method Summary
`ValueRepresentation` `evaluateVariable(XPathContext c)` Evaluate the variable
`int` `getInstructionNameCode()` Get the name of this instruction for diagnostic and tracing purposes
`Iterator` `iterateSubExpressions()` Get all the XPath expressions associated with this instruction (in XSLT terms, the expression present on attributes of the instruction, as distinct from the child instructions in a sequence construction)
`TailCall` `processLeavingTail(XPathContext context)` Process the local parameter declaration
`boolean` `replaceSubExpression(Expression original, Expression replacement)` Replace one subexpression by a replacement subexpression
`void` `setConversion(Expression convertor)` Define a conversion that is to be applied to the supplied parameter value.

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

`display, evaluateItem, getCardinality, getItemType, getLocalSlotNumber, getNameCode, getRequiredType, getSelectExpression, getSelectValue, getSlotNumber, getVariableFingerprint, getVariableName, init, isAssignable, isGlobal, isImplicitlyRequiredParam, isRequiredParam, isTunnelParam, iterate, optimize, setAssignable, setImplicitlyRequiredParam, setNameCode, setReferenceCount, setRequiredParam, setRequiredType, setSelectExpression, setSlotNumber, setTunnel, setVariableName, simplify, typeCheck`

Methods inherited from class net.sf.saxon.instruct.Instruction
`appendItem, computeCardinality, computeSpecialProperties, createsNewNodes, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, isXSLT, process, promote`

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

`adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, effectiveBooleanValue, getColumnNumber, getContainingProcedure, getDependencies, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface javax.xml.transform.SourceLocator
`getColumnNumber, getLineNumber, getPublicId, getSystemId`

Constructor Detail

### LocalParam

    public LocalParam()

Method Detail

### setConversion

    public void setConversion(Expression convertor)

  Define a conversion that is to be applied to the supplied parameter value.

  Parameters:
    `convertor` -

### getInstructionNameCode

    public int getInstructionNameCode()

  Get the name of this instruction for diagnostic and tracing purposes

  Overrides:
    `getInstructionNameCode` in class `GeneralVariable`

### iterateSubExpressions

    public Iterator iterateSubExpressions()

  Get all the XPath expressions associated with this instruction (in XSLT terms, the expression present on attributes of the instruction, as distinct from the child instructions in a sequence construction)

  Overrides:
    `iterateSubExpressions` in class `GeneralVariable`
  Returns:
    an iterator containing the sub-expressions of this expression

### replaceSubExpression

    public boolean replaceSubExpression(Expression original,
                                        Expression replacement)

  Replace one subexpression by a replacement subexpression

  Specified by:
    `replaceSubExpression` in interface `Container`
  Overrides:
    `replaceSubExpression` in class `GeneralVariable`
  Parameters:
    `original` - the original subexpression
    `replacement` - the replacement subexpression
  Returns:
    true if the original subexpression is found

### processLeavingTail

    public TailCall processLeavingTail(XPathContext context)
                                throws XPathException

  Process the local parameter 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`

### evaluateVariable

    public ValueRepresentation evaluateVariable(XPathContext c)

  Evaluate the variable

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