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

import edu.neu.ccs.demeter.*;
add: class FlattenVisitor extends Visitor {
  public constructor FlattenVisitor() {{
    super();
  }}
  public static FlattenVisitor parse(java.io.Reader in)
    throws ParseException
  {{ return new Parser(in)._FlattenVisitor(); }}
  public static FlattenVisitor parse(java.io.InputStream in)
    throws ParseException
  {{ return new Parser(in)._FlattenVisitor(); }}
  public static FlattenVisitor parse(String s) {{
    try { return parse(new java.io.StringReader(s)); }
    catch (ParseException e) {
      throw new RuntimeException(e.toString());
    }
  }}
{{
  HashSet commonParents; 	// Names of classes to add common parts to
  HashSet commonChildren;	// Common children to add to parent
  boolean debug = false;
  boolean flush = true;
  boolean parent = true;	// To tell if parent or child class
  boolean add = false;

  FlattenVisitor(boolean d) {
    commonParents = new HashSet(); commonChildren = new HashSet();
    debug = d;
  }

  void before(Adjacency host) {
    if (flush) {
      commonParents.clear();
      commonChildren.clear();
    }
    else {
      if (commonParents.contains(host.get_source())) {
        add = true;
      }
    }
  }

  void after(Adjacency host) {
    add = false;
  }

  void before(Neighbors_wc host) {
    if (add) {
      Iterator step = commonChildren.iterator();

      while(step.hasNext())
        host.get_construct_ns().addElement((Any_vertex)step.next());
    }
  }

  void before(Neighbors host) {
    parent = false;
  }

  void after(Neighbors host) {
    parent = true;
  }

  void before(Common host) {
    flush = false;
    commonChildren.add(host);
  }

  void before(Vertex host) {
    if (!parent)
      commonParents.add(host);
  }
}}
{{  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_);
    universal_trv0_aft(_v_);
  }
}}
}