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  package org.apache.cayenne.exp.parser;
  
  /** 
   * Provides basic machinery for constructing the parent and child relationships 
   * between nodes. All AST nodes must implement this interface. 
   * 
   * <p>Generated by JJTree</p>
   * 
   * @since 1.1
   */ 
  public interface Node {
  
      /** Called after the node has been made the current
        node.  It indicates that child nodes can now be added to it. */
      public void jjtOpen();
  
      /** Called after all the child nodes have been
        added. */
      public void jjtClose();
  
      /** This pair of methods are used to inform the node of its
        parent. */
      public void jjtSetParent(Node n);
      public Node jjtGetParent();
  
      /** This method tells the node to add its argument to the node's
        list of children.  */
      public void jjtAddChild(Node n, int i);
  
      /** This method returns a child node.  The children are numbered
         from zero, left to right. */
      public Node jjtGetChild(int i);
  
      /** Return the number of children the node has. */
      public int jjtGetNumChildren();
  }
  