[stringtemplate-interest] Web app - read templates from multiple directories

[Ran Tavory]

I've implemented a string template result type for struts2, and so far I'm
very happy with st, but there's one limitation I haven't been able to figure
out.
It seems ST requires all template files to be at the same directory. (or did
I miss anything?...)
So, for medium to large web-apps this is an annoyance. I'd like to be able
to create multiple directories, such as "full_pages" or "layouts" or
"snippets" or "reports" and be able to load multiple .st files from their
common parent directory.

Is there a way to get over this limitation?

Here's the code I have. I'll paste it below, hope formatting goes well:

  /**

   * Execute this result, using the specified template location.

   * <p/>

   * The template location has already been interpolated for any variable

   * substitutions.

   * <p/>

   * NOTE: The current implementation is still under development and has
several restrictions.

   * <ul>

   * <li>All template files must end with .st</li>

   * <li>All template files must be at the same directory. No subdirectories
allowed for now,

   *     sorry</li>

   * </ul>

   */

  public void doExecute(String location, ActionInvocation invocation)
throwsIOException,

      TemplateException {


    final HttpServletRequest request = ServletActionContext.getRequest();

    final HttpServletResponse response = ServletActionContext.getResponse();


    if (!location.startsWith("/")) {

      // Create a fully qualified resource name.

      // final ActionContext ctx = invocation.getInvocationContext();

      final String base = ResourceUtil.getResourceBase(request);

      location = base + "/" + location;

    }


    final String encoding = getEncoding(location);

    String contentType = getContentType(location);


    if (encoding != null) {

      contentType = contentType + ";charset=" + encoding;

    }


    response.setContentType(contentType);


    final String fullyQualifiedLocation =
ServletActionContext.getServletContext().getRealPath(

        location);

    final File templateFile = new File(fullyQualifiedLocation);

    if (!templateFile.exists()) {

      log.error("Template file not found: " + fullyQualifiedLocation);

      return;

    }

    final StringTemplateGroup group = new StringTemplateGroup("webpages",
templateFile.getParent());

    String fileName = templateFile.getName();

    if (fileName.endsWith(".st")) {

      fileName = fileName.substring(0, fileName.length() - ".st".length());

    }

    final StringTemplate template = group.getInstanceOf(fileName);


    final Map<String, Object> model = createModel(invocation);

    template.setAttributes(model);


    // Output to client

    final Writer responseWriter = response.getWriter();

    final StringTemplateWriter templateWriter =
newNoIndentWriter(responseWriter);

    template.write(templateWriter);

    // Flush'n'close

    responseWriter.flush();

    responseWriter.close();

  }
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