//==============================================================================
// Node.java
//==============================================================================

package sample.visitor;

/**
* Responsibilities:<ul>
* <li>represents a program node in an abstract syntax tree (AST).</li>
* </ul><p></p>
* 
* @author Copyright 2003 Nikolas S. Boyd.
*/
public abstract class Node {

	/**
	* Responsibilities:<ul>
	* <li>visits a node in a program AST.</li>
	* </ul><p></p>
	* 
	* @author Copyright 2003 Nikolas S. Boyd.
	*/
	public interface Visitor {

		/**
		* Visits a <tt>node</tt>.
		* @param node represents a node in a program AST.
		*/
		public void visit(Node node);

	} // Node.Visitor

	/**
	* Accepts a node <tt>visitor</tt> for this kind of AST node.
	* @param visitor knows what to do with this kind of node.
	*/
	public abstract void accept(Visitor visitor);

} // Node