Class NodeListExpression


  • public class NodeListExpression
    extends NodeSetExpression
    A NodeListExpression is an expression denoting a set of nodes sorted in document order.
    It is not possible to write a NodeListExpression directly using XPath; however a node set expression is treated as a NodeListExpression when it appears in certain contexts, specifically the select attribute of xsl:apply-templates or xsl:for-each.
    • Constructor Detail

      • NodeListExpression

        public NodeListExpression​(Expression exp)
        Constructor
        Parameters:
        exp - The expression that delivers the unsorted node-set
    • Method Detail

      • getDependencies

        public int getDependencies()
        Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE
        Specified by:
        getDependencies in class Expression
      • reduce

        public Expression reduce​(int dependencies,
                                 Context context)
                          throws XPathException
        Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
        Specified by:
        reduce in class Expression
        Parameters:
        dependencies - The dependencies to be removed
        context - The context to be used for the partial evaluation
        Returns:
        a new expression that does not have any of the specified dependencies
        Throws:
        XPathException
      • enumerate

        public NodeEnumeration enumerate​(Context c,
                                         boolean sort)
                                  throws XPathException
        Return an enumeration that returns the nodes in document order
        Specified by:
        enumerate in class NodeSetExpression
        Parameters:
        c - the evaluation context
        sort - : ignored, this class is used because the enumeration is always in document order
        Throws:
        XPathException - when the expression does not return a nodeset.
      • display

        public void display​(int level)
        Diagnostic print of expression structure
        Specified by:
        display in class Expression