Class ProcessingInstruction

All Implemented Interfaces:
Serializable, SourceLocator, Container, Expression, TailCallReturner, InstructionInfoProvider

public class ProcessingInstruction extends SimpleNodeConstructor
An xsl:processing-instruction element in the stylesheet.
See Also:
  • Constructor Details

    • 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 Details

    • getInstructionNameCode

      public int getInstructionNameCode()
      Get the name of this instruction for diagnostic and tracing purposes
      Overrides:
      getInstructionNameCode in class Instruction
      Returns:
      the string "xsl:processing-instruction"
    • getItemType

      public ItemType getItemType(TypeHierarchy th)
      Description copied from class: Instruction
      Get the item type of the items returned by evaluating this instruction
      Specified by:
      getItemType in interface Expression
      Overrides:
      getItemType in class Instruction
      Parameters:
      th -
      Returns:
      the static item type of the instruction
    • getCardinality

      public int getCardinality()
      Description copied from class: ComputedExpression
      Determine the static cardinality of the expression. This establishes how many items there will be in the result of the expression, at compile time (i.e., without actually evaluating the result.
      Specified by:
      getCardinality in interface Expression
      Overrides:
      getCardinality in class ComputedExpression
      Returns:
      one of the values Cardinality.ONE_OR_MORE, Cardinality.ZERO_OR_MORE, Cardinality.EXACTLY_ONE, Cardinality.ZERO_OR_ONE, Cardinality.EMPTY. This default implementation returns ZERO_OR_MORE (which effectively gives no information).
    • simplify

      public Expression simplify(StaticContext env) throws XPathException
      Description copied from class: Instruction
      Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression). The default implementation does nothing.
      Specified by:
      simplify in interface Expression
      Overrides:
      simplify in class SimpleNodeConstructor
      Parameters:
      env - the static context
      Returns:
      the simplified expression
      Throws:
      XPathException - if an error is discovered during expression rewriting
    • localTypeCheck

      public void localTypeCheck(StaticContext env, ItemType contextItemType) throws XPathException
      Specified by:
      localTypeCheck in class SimpleNodeConstructor
      Throws:
      XPathException
    • getDependencies

      public int getDependencies()
      Description copied from class: ComputedExpression
      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 ComputedExpression
      Returns:
      a set of bit-significant flags identifying the dependencies of the expression
    • iterateSubExpressions

      public Iterator iterateSubExpressions()
      Description copied from class: ComputedExpression
      Get the immediate sub-expressions of this expression. Default implementation returns a zero-length array, appropriate for an expression that has no sub-expressions.
      Specified by:
      iterateSubExpressions in interface Expression
      Overrides:
      iterateSubExpressions in class SimpleNodeConstructor
      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 SimpleNodeConstructor
      Parameters:
      original - the original subexpression
      replacement - the replacement subexpression
      Returns:
      true if the original subexpression is found
    • promoteInst

      protected 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.
      Overrides:
      promoteInst in class SimpleNodeConstructor
      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 XPathException
      Process this instruction, that is, produce a processing-instruction node in the result sequence.
      Specified by:
      processLeavingTail in interface TailCallReturner
      Specified by:
      processLeavingTail in class Instruction
      Parameters:
      context - the dynamic context of this transformation
      Returns:
      always returns null in this implementation
      Throws:
      XPathException - if any non-recoverable dynamic error occurs
    • checkContent

      protected String checkContent(String data, XPathContext context) throws DynamicError
      Check the content of the node, and adjust it if necessary
      Overrides:
      checkContent in class SimpleNodeConstructor
      Parameters:
      data - the supplied content
      context - the dynamic context
      Returns:
      the original content, unless adjustments are needed
      Throws:
      DynamicError - if the content is invalid
    • evaluateNameCode

      public int evaluateNameCode(XPathContext context) throws XPathException
      Overrides:
      evaluateNameCode in class SimpleNodeConstructor
      Throws:
      XPathException
    • display

      public void display(int level, PrintStream out, Configuration config)
      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
      out - Output destination
      config -