Class ValueOf

  • All Implemented Interfaces:
    java.io.Serializable, javax.xml.transform.SourceLocator, Container, Expression, TailCallReturner, InstructionInfoProvider

    public final class ValueOf
    extends SimpleNodeConstructor
    An xsl:value-of element in the stylesheet.
    The xsl:value-of element takes attributes:
    • a mandatory attribute select="expression". This must be a valid String expression
    • an optional disable-output-escaping attribute, value "yes" or "no"
    • an optional separator attribute. This is handled at compile-time: if the separator attribute is present, the select expression passed in here will be a call to the string-join() function.
    See Also:
    Serialized Form
    • Constructor Detail

      • ValueOf

        public ValueOf​(Expression select,
                       boolean disable,
                       boolean noNodeIfEmpty)
    • Method Detail

      • setIsNumberingInstruction

        public void setIsNumberingInstruction()
        Indicate that this is really an xsl:nunber instruction
      • isNumberingInstruction

        public boolean isNumberingInstruction()
        Determine whether this is really an xsl:number instruction
      • getInstructionNameCode

        public int getInstructionNameCode()
        Get the name of this instruction for diagnostic and tracing purposes
        Overrides:
        getInstructionNameCode in class Instruction
      • 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
      • computeCardinality

        public int computeCardinality()
        Description copied from class: Instruction
        Get the cardinality of the sequence returned by evaluating this instruction
        Overrides:
        computeCardinality in class Instruction
        Returns:
        the static cardinality
      • convertToStringJoin

        public Expression convertToStringJoin​(StaticContext env)
        Convert this value-of instruction to an expression that delivers the string-value of the resulting text node. This will often be a call on the string-join function.
      • display

        public void display​(int level,
                            java.io.PrintStream out,
                            Configuration config)
        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