code: public String getArgTypes()
      {
          StringBuffer sb = new StringBuffer();
          int i = 0;
  
          if ( _methodDecl == null || _methodDecl.getParameters() == null )
              return "";
          
          for (ParameterDeclaration paramDecl : _methodDecl.getParameters())
          {
              if (i++ != 0)
                  sb.append(", ");
  
              TypeMirror paramType = paramDecl.getType();
              if (paramType == null)
                  return "";
  
              //
              // Use the erasure here, because we only want the raw type, not the reference
              // type
              //
              sb.append(_ap.getAnnotationProcessorEnvironment().getTypeUtils().getErasure(paramType));
              sb.append(".class");
          }
          return sb.toString();
      }
docs: Returns the the method argument classes, in a comma separated list