core:
import edu.neu.ccs.demeter.dj.*;

import edu.neu.ccs.demeter.*;
add: class Container {
  protected List contents;
  public List get_contents() {{ return contents; }}
  public void set_contents(List new_contents)
    {{ contents = new_contents; }}
  public constructor Container() {{ super(); }}
  public constructor Container(List contents) {{
    super();
    set_contents(contents);
  }}
  public static Container parse(java.io.Reader in)
    throws ParseException
  {{ return new Parser(in)._Container(); }}
  public static Container parse(java.io.InputStream in)
    throws ParseException
  {{ return new Parser(in)._Container(); }}
  public static Container parse(String s) {{
    try { return parse(new java.io.StringReader(s)); }
    catch (ParseException e) {
      throw new RuntimeException(e.toString());
    }
  }}
{{
  float statistics(TraversalGraph whereToGo) throws Exception {

    CountingVisitorDJ cV = new CountingVisitorDJ();		//1
    SummingVisitorDJ sV = new SummingVisitorDJ();		//1
    AverageVisitorDJ aV = new AverageVisitorDJ();		//1
    ResultVisitorDJ rV = new ResultVisitorDJ();

    // establish communication between visitors
    aV.set_cV(cV);
    aV.set_sV(sV);     
    rV.set_aV(aV);

// replace the following
//    Visitor[] visitors = new Visitor[4];
//    visitors[0]=(Visitor) rV;
//    visitors[1]=(Visitor) sV;
//    visitors[2]=(Visitor) cV;
//    visitors[3]=(Visitor) aV;
//    System.out.println("visitors prepared");
//    Float res = (Float) whereToGo.traverse(this, visitors);

    Float res = (Float)  whereToGo.traverse(this,
    	     new Visitor[] { rV, sV, cV, aV });

    return res.floatValue();
  }  
}}
{{  void universal_trv0_bef(UniversalVisitor _v_) {
    ((UniversalVisitor) _v_).before(this);
  }
}}
{{  void universal_trv0_aft(UniversalVisitor _v_) {
    ((UniversalVisitor) _v_).after(this);
  }
}}
{{  void universal_trv0(UniversalVisitor _v_) {
    universal_trv0_bef(_v_);
    ((UniversalVisitor) _v_).before_contents(this, contents);
    contents.universal_trv0(_v_);
    ((UniversalVisitor) _v_).after_contents(this, contents);
    universal_trv0_aft(_v_);
  }
}}
}