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;
  
  import parser.visitor.*;
  import prism.PrismLangException;
  
  public class SystemReference extends SystemDefn
  {
  	// Name of SystemDefn referenced
  	private String name;
  	
  	// Constructors
  	
  	public SystemReference(String name)
  	{
  		this.name = name;
  	}
  	
  	// Set method
  	
  	public void setName(String name)
  	{
  		this.name = name;
  	}
  	
  	// Get method
  	
  	public String getName()
  	{
  		return name;
  	}
  	
  	// Methods required for SystemDefn (all subclasses should implement):
  	
  	@Override
  	public void getModules(Vector<String> v)
  	{
  		v.addElement(name);
  	}
  	
  	@Override
  	public void getModules(Vector<String> v, ModulesFile modulesFile)
  	{
  		// Recurse into referenced SystemDefn
  		SystemDefn ref = modulesFile.getSystemDefnByName(name);
  		if (ref != null) {
  			ref.getModules(v, modulesFile);
  		}
  	}
  	
  	@Override
  	public void getSynchs(Vector<String> v)
  	{
  		// do nothing
  	}
  	
  	@Override
  	public void getSynchs(Vector<String> v, ModulesFile modulesFile)
  	{
  		// Recurse into referenced SystemDefn
  		SystemDefn ref = modulesFile.getSystemDefnByName(name);
  		if (ref != null) {
  			ref.getSynchs(v, modulesFile);
  		}
  	}
  	
  	@Override
  	public void getReferences(Vector<String> v)
  	{
  		if (!v.contains(name))
  			v.add(name);
  	}
  	
  	// Methods required for ASTElement:
  	
  	@Override
  	public Object accept(ASTVisitor v) throws PrismLangException
  	{
  		return v.visit(this);
  	}
  	
  	@Override
  	public String toString()
  	{
  		return "\"" + name + "\"";
  	}
  	
  	@Override
  	public SystemDefn deepCopy()
  	{
  		SystemDefn ret = new SystemReference(name);
  		ret.setPosition(this);
  		return ret;
  	}
  }
  
  //------------------------------------------------------------------------------
  