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 Details

    • NodeListExpression

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

    • simplify

      public Expression simplify() throws XPathException
      Simplify the expression
      Overrides:
      simplify in class Expression
      Returns:
      the simplified expression
      Throws:
      XPathException
    • 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