import edu.neu.ccs.demeter.dj.*;
import java.util.*;
import edu.neu.ccs.demeter.*;
 class PackageName implements java.util.Enumeration, Cloneable {
  protected Nonempty_PackageName first;
  public Nonempty_PackageName get_first() { return first;   }
  public void set_first(Nonempty_PackageName new_first) { first = new_first;   }
  public PackageName() { super();   }
  public PackageName(Nonempty_PackageName first) {
    super();
    set_first(first);
    }
  public static PackageName parse(java.io.Reader in) throws ParseException { return new Parser(in)._PackageName();   }
  public static PackageName parse(java.io.InputStream in) throws ParseException { return new Parser(in)._PackageName();   }
  public static PackageName parse(String s) {
    try { return parse(new java.io.StringReader(s)); }
    catch (ParseException e) {
      throw new RuntimeException(e.toString());
    }
    }
    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_first(this, first);
    first.universal_trv0(_v_);
    ((UniversalVisitor) _v_).after_first(this, first);
    universal_trv0_aft(_v_);
  }

    void __trav_display_Cd_graph_trv_bef(DisplayVisitor __v0) {
    ((DisplayVisitor) __v0).before(this);
  }

    void __trav_display_Cd_graph_trv_aft(DisplayVisitor __v0) {
    ((DisplayVisitor) __v0).after(this);
  }

    void __trav_display_Cd_graph_trv(DisplayVisitor __v0) {
    __trav_display_Cd_graph_trv_bef(__v0);
    ((DisplayVisitor) __v0).before_first(this, first);
    first.__trav_display_Cd_graph_trv(__v0);
    ((UniversalVisitor) __v0).after_first(this, first);
    __trav_display_Cd_graph_trv_aft(__v0);
  }

  
  private Nonempty_PackageName tail;
  public void addElement(Ident e) { 
    checktail(); 
    if (tail == null) {
      first = new Nonempty_PackageName(e,null); tail = first;
    } else {
	tail.set_next(new Nonempty_PackageName(e,null)); tail = tail.get_next();
    }
  }

  public void push(Ident e) { first = new Nonempty_PackageName(e,first); }

  public java.util.Enumeration elements() { return new PackageName(first); } 

  public int size() {
    int i= 0;
    for (java.util.Enumeration e=elements(); e.hasMoreElements(); i++)
	e.nextElement();
    return i;
  }
  public boolean isEmpty() { return (first == null); }

  public boolean hasMoreElements() { return (first != null); }

  public Object nextElement() {
    Ident car = first.get_it();
    first = first.get_next();
    return (Object) car;
  }

  private void checktail() {
    if (tail == null && first != null) {
	tail = first;
	while (tail.get_next() != null) tail = tail.get_next();
    }
  }
  public boolean contains(Ident e) {
    java.util.Enumeration en = this.elements();
    while (en.hasMoreElements())
	if (e.equals((Ident) en.nextElement())) return true;
    return false;
  }

}