/**
 * Node for the parse tree
 *
 * @author <a href="http://www.heimetli.ch/te.html">P. Tellenbach</a>
 * @version 16. Dec. 2007
 */
public class Node
{
   /** Content of the node */
   protected String string ;

   /** Reference to the left subtree */
   protected Node left ;

   /** Reference to the right subtree */
   protected Node right ;

   /**
    * Constructs a new node, sets the left
    * and the right subtree to <code>null</code>
    * @param str the content of the node
    */
   public Node( String str )
   {
      string = str ;
      left   = null ;
      right  = null ;
   }

   /** Getter for the content */
   public String getString()
   {
      return string ;
   }

   /** Getter for the left subtree */
   public Node getLeft()
   {
      return left ;
   }

   /** Setter for the left subtree */
   public void setLeft( Node n )
   {
      left = n ;
   }

   /** Getter for the right subtree */
   public Node getRight()
   {
      return right ;
   }

   /** Setter for the right subtree */
   public void setRight( Node n )
   {
      right = n ;
   }
}