code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Dave Parker <d.a.parker@cs.bham.ac.uk> (University of Birmingham/Oxford)
  //	
  //------------------------------------------------------------------------------
  //	
  //	This file is part of PRISM.
  //	
  //	PRISM is free software; you can redistribute it and/or modify
  //	it under the terms of the GNU General Public License as published by
  //	the Free Software Foundation; either version 2 of the License, or
  //	(at your option) any later version.
  //	
  //	PRISM is distributed in the hope that it will be useful,
  //	but WITHOUT ANY WARRANTY; without even the implied warranty of
  //	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  //	GNU General Public License for more details.
  //	
  //	You should have received a copy of the GNU General Public License
  //	along with PRISM; if not, write to the Free Software Foundation,
  //	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  //	
  //==============================================================================
  
  package parser.ast;
  
  import java.util.Vector;
  
  public abstract class SystemDefn extends ASTElement
  {
  	// Overrided version of deepCopy() from superclass ASTElement (to reduce casting).
  
  	/**
  	 * Perform a deep copy.
  	 */
  	public abstract SystemDefn deepCopy();
  
  	// Methods required for SystemDefn (all subclasses should implement):
  
  	/**
  	 * Get list of all modules appearing (recursively).
  	 * Duplicates are not removed and will appear multiple times in the list.
  	 * @deprecated Use {@link SystemDefn#getModules(Vector, ModulesFile)} instead.
  	 */
  	@Deprecated
  	public abstract void getModules(Vector<String> v);
  
  	/**
  	 * Get list of all modules appearing (recursively, including descent into references).
  	 * Duplicates are not removed and will appear multiple times in the list.
  	 */
  	public abstract void getModules(Vector<String> v, ModulesFile modulesFile);
  
  	/**
  	 * Get list of all synchronising actions _introduced_ (recursively).
  	 * @deprecated Use {@link SystemDefn#getSynchs(Vector, ModulesFile)} instead.
  	 */
  	@Deprecated
  	public abstract void getSynchs(Vector<String> v);
  
  	/**
  	 * Get list of all synchronising actions _introduced_ (recursively, including descent into references).
  	 */
  	public abstract void getSynchs(Vector<String> v, ModulesFile modulesFile);
  
  	/**
  	 * Get list of all references to other SystemDefns (recursively, but not following references).
  	 */
  	public abstract void getReferences(Vector<String> v);
  }
  
  //------------------------------------------------------------------------------
  