GeneratedCodeCategory{
  void expandEntityTemplates(ExpansionContext context,
                             MacroTable macros,
                             CmdArgs args,
                             SourceList sources)
    to {HeaderTemplate,ImplTemplate}
  {
    (@
      GeneratedCodeCategory category;
    @)
    before GeneratedCodeCategory (@
      category = host;
    @)
    before HeaderTemplate (@
      if(args.getHeaderOutDir() != null){
        System.out.println("Expanding Header Template");
        File headerFile = category.headerFile(context.get_entity());
        macros.define("File",headerFile.getName());
        host.expand(context,macros,args);
      }      
    @)
    before ImplTemplate (@
      if(args.getImplOutDir() != null){
        System.out.println("Expanding Impl Template");
        File implFile = category.implFile(context.get_entity());
        sources.add(implFile.getName());
        macros.define("File",implFile.getName());
        host.expand(context,macros,args);
      }
    @)
  }
  void expandMakeTemplate(CmdArgs args, SourceList sources)
    to MakeTemplate
  {
    before MakeTemplate (@
      if(args.getImplOutDir() != null){
        System.out.println("Expanding Make Template");
      }
    @)
  }
}
HeaderTemplate{
  void expand(ExpansionContext context,
              MacroTable macros,
              CmdArgs args) (@
    System.out.println("Expanding Header Template");
    macros.display();
  @)
}
ImplTemplate{
  void expand(ExpansionContext context,
              MacroTable macros,
              CmdArgs args) (@
    System.out.println("Expanding Impl Template");
    macros.display();
  @)
}