Class ContextNodeExpression


public final class ContextNodeExpression extends SingletonExpression
This class represents the expression ".", which always returns the context node.
  • Constructor Details

    • ContextNodeExpression

      public ContextNodeExpression()
  • Method Details

    • getNode

      public NodeInfo getNode(Context context) throws XPathException
      Return the node selected by this expression.
      Specified by:
      getNode in class SingletonExpression
      Parameters:
      context - The context for the evaluation
      Returns:
      one NodeInfo only, namely the current node defined by the context
      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
    • display

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