package org.webslinger.rules;

 import java.util.ListIterator;

 /* All AST nodes must implement this interface.    It provides basic

      machinery for constructing the parent and child relationships

      between nodes. */

 public interface Node extends Iterable<Node> {

     /** This method is called after the node has been made the current

         node.    It indicates that child nodes can now be added to it. */

     void jjtOpen();

     /** This method is called after all the child nodes have been

         added. */

     void jjtClose();

     /** This pair of methods are used to inform the node of its

         parent. */

     void jjtSetParent(Node n);

     Node jjtGetParent();

     /** This method tells the node to add its argument to the node's

         list of children.    */

     void jjtAddChild(Node n, int i);

     /** This method returns a child node.    The children are numbered

          from zero, left to right. */

     Node jjtGetChild(int i);

     /** Return the number of children the node has. */

     int jjtGetNumChildren();

     ListIterator<Node> getChildrenIterator();

     ListIterator<Node> iterator();

     /** Accept the visitor. **/

     Object jjtAccept(RulesVisitor visitor, Object data);

 }