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  package org.apache.cayenne.template.parser;
  
  import org.apache.cayenne.template.Context;
  
  /**
   * All AST nodes must implement this interface.  It provides basic
   * machinery for constructing the parent and child relationships
   * between nodes.
   * @since 4.1
   */
  public interface Node {
  
      /**
       * 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();
  
      void evaluate(Context context);
  }
  