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  package org.apache.cayenne.ejbql.parser;
  
  import org.apache.cayenne.ejbql.EJBQLExpression;
  
  /**
   * A JJTree-compliant tree node interface.
   * 
   * @since 3.0
   */
  public interface Node extends EJBQLExpression {
  	/**
  	 * This method is called after the node has been made the current node. It
  	 * indicates that child nodes can now be added to it.
  	 */
  	public void jjtOpen();
  
  	/**
  	 * This method is 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();
  }
  