// util.beh
//
// This file contains various utillity functions which are used throughout
// the program.

Cd_graph {
{{
   // Returns the Adjacency represented by id.  Returns null if no match is
   // found.
   public Adjacency search(Ident id) {
      TraversalGraph tg = new TraversalGraph(
         "from Cd_graph bypassing ParentList to Adjacency",
         Main.cg
      );
      return (Adjacency) tg.traverse(this, new FindClassVisitor(id));

   }
}}
}

// Visitor class which implements the Cd_graph::search() method.  Searches
// the Cd_graph for the Adjacency represented by id.  The variable rv
// stores the return value.
FindClassVisitor { 
{{
   public FindClassVisitor(Ident id) {
      super();
      set_rv(null);
      set_id(id);
   }

   public void before(Adjacency a) {
      if (id.equals(a.fetchIdent()))
         rv = a;
   }
   public Object getReturnValue() {
      return rv;
   }
            
}}
}


Adjacency {
{{
    // Returns an Ident representation of the Adjacency.
    public Ident fetchIdent() {
       TraversalGraph tg = new TraversalGraph(
          "from Adjacency bypassing {Neighbors, Vertex_Comma_list} to " + Main.IdentLoc,
          Main.cg
       );
       return (Ident) tg.fetch(this);
    }

    // Returns an Adjacency_List consisting of all immediate superclasses.
    // If there are no superclasses defined in the class dictionary
    // then null is returned.
    public Adjacency_List fetchParents() {
       TraversalGraph tg = new TraversalGraph(
          "from Adjacency to-stop Adjacency_List",
          Main.cg
       );

       return (Adjacency_List) tg.fetch(this);
    }

}}
}


Term {
{{
   // Returns the Ident representation of the Term object. 
   public Ident fetchIdent() {
// This traversal does not work, not sure why...  Will just fetch the
// Ident directly for now...
//
//      TraversalGraph tg = new TraversalGraph(
//         "from Term only-through Vertex to " + Main.IdentLoc,
//         Main.cg
//      );
//      return (Ident) tg.fetch(this);

      return vertex.get_vertex_name();
   }

}}
}