net.sf.saxon.instruct
Class ProcessingInstruction

java.lang.Object
  net.sf.saxon.instruct.Instruction
      net.sf.saxon.instruct.ExprInstruction
          net.sf.saxon.instruct.SimpleNodeConstructor
              net.sf.saxon.instruct.ProcessingInstruction

All Implemented Interfaces:

Serializable, SourceLocator, Expression

public class ProcessingInstruction
extends SimpleNodeConstructor

An xsl:processing-instruction element in the stylesheet.

See Also:

Serialized Form

Field Summary

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

select, separator

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

children

Constructor Summary

ProcessingInstruction(Expression name)
Create an xsl:processing-instruction instruction

Method Summary

void	display(int level, NamePool pool) Display this instruction as an expression, for diagnostics
protected int	evaluateNameCode(XPathContext context)
int	getDependencies() Determine which aspects of the context the expression depends on.
SequenceType	getResultType() Get the static type of the value returned by the instruction
void	getXPathExpressions(List list)
TailCall	processLeavingTail(XPathContext context) Process this instruction, that is, produce a processing-instruction node in the result sequence.
void	promoteInst(PromotionOffer offer) Offer promotion for subexpressions.
void	setInstructionDetails(Controller controller, NamePool namePool, InstructionDetails details) Get the name of this instruction for diagnostic and tracing purposes
void	typeCheck(StaticContext env)

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

analyze, evaluateItem, expandChildren, setSelect, setSeparator

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

effectiveBooleanValue, evaluateAsString, getCardinality, getItemType, getSpecialProperties, getSubExpressions, iterate, promote, simplify

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

assembleParams, assembleTunnelParams, getChildren, getColumnNumber, getInstructionDetails, getInstructionName, getLineNumber, getPublicId, getSystemId, getSystemId, process, processChildren, processChildrenLeavingTail, recoverableError, setChildren, setSourceLocation, styleError, styleError

Methods inherited from class java.lang.Object

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

Constructor Detail

ProcessingInstruction

public ProcessingInstruction(Expression name)

Create an xsl:processing-instruction instruction

Parameters:

name - the expression used to compute the name of the generated processing-instruction

Method Detail

setInstructionDetails

public void setInstructionDetails(Controller controller,
                                  NamePool namePool,
                                  InstructionDetails details)

Get the name of this instruction for diagnostic and tracing purposes

Specified by:

setInstructionDetails in class Instruction

getResultType

public SequenceType getResultType()

Description copied from class: Instruction

Get the static type of the value returned by the instruction

Overrides:

getResultType in class Instruction

Returns:

the SequenceType that the returned value will conform to.

typeCheck

public void typeCheck(StaticContext env)
               throws XPathException

Specified by:

typeCheck in class SimpleNodeConstructor

Throws:

XPathException

getDependencies

public int getDependencies()

Description copied from interface: Expression

Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as XPathContext.VARIABLES and XPathContext.CURRENT_NODE. The default implementation combines the intrinsic dependencies of this expression with the dependencies of the subexpressions, computed recursively. This is overridden for expressions such as FilterExpression where a subexpression's dependencies are not necessarily inherited by the parent expression.

Specified by:

getDependencies in interface Expression

Overrides:

getDependencies in class ExprInstruction

Returns:

a set of bit-significant flags identifying the dependencies of the expression

getXPathExpressions

public void getXPathExpressions(List list)

Overrides:

getXPathExpressions in class SimpleNodeConstructor

promoteInst

public void promoteInst(PromotionOffer offer)
                 throws XPathException

Offer promotion for subexpressions. The offer will be accepted if the subexpression is not dependent on the factors (e.g. the context item) identified in the PromotionOffer. By default the offer is not accepted - this is appropriate in the case of simple expressions such as constant values and variable references where promotion would give no performance advantage. This method is always called at compile time.

Specified by:

promoteInst in class ExprInstruction

Parameters:

offer - details of the offer, for example the offer to move expressions that don't depend on the context to an outer level in the containing expression

Throws:

XPathException - if any error is detected

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws TransformerException

Process this instruction, that is, produce a processing-instruction node in the result sequence.

Specified by:

processLeavingTail in class Instruction

Parameters:

context - the dynamic context of this transformation

Returns:

always returns null in this implementation

Throws:

TransformerException - if any non-recoverable dynamic error occurs

evaluateNameCode

protected int evaluateNameCode(XPathContext context)
                        throws XPathException

Overrides:

evaluateNameCode in class SimpleNodeConstructor

Throws:

XPathException

display

public void display(int level,
                    NamePool pool)

Description copied from class: SimpleNodeConstructor

Display this instruction as an expression, for diagnostics

Specified by:

display in interface Expression

Overrides:

display in class SimpleNodeConstructor

Parameters:

level - indentation level for this expression