/**
* Set the ServletTemplateEngine and ServletTemplateContext in our Melati. This allows us to parse
* any uploaded files before we enter our PoemSession (so we don't hang on to transactions
* unnecessarily).
*
* @param melati the current Melati
* @throws Exception if anything goes wrong
*/
protected void prePoemSession(Melati melati) throws Exception {
// for this request, set the Initialised Template Engine
melati.setTemplateEngine(templateEngine);
ServletTemplateContext templateContext = templateEngine.getServletTemplateContext(melati);
melati.setTemplateContext(templateContext);
}
/**
* Send an error message.
*
* <p>Single call to the templet loader giving purpose (error) and Exception class.
*
* <p>This will look in the purpose directory, the standard templet directory and the classpath,
* in that order, for a templet. This can no longer fail with NotFoundException, as the Object
* templet will always be found (or this is a broken installation).
*
* @param melati the {@link Melati}
* @param e the {@link Exception} to report
*/
public void error(Melati melati, Exception e) {
melati.getResponse().setStatus(httpStatusCode(e));
ServletTemplateContext templateContext = melati.getServletTemplateContext();
// If this a DB error which has occurred prior to
// the establishment of a template context
if (templateContext == null) {
super.error(melati, e);
} else
// has it been trapped already, if so, we don't need to relog it here
if (!(e instanceof TrappedException)) {
try {
// log it
e.printStackTrace(System.err);
// and put it on the page
MelatiWriter mw = melati.getWriter();
// get rid of anything that has been written so far
mw.reset();
templateContext.put("melati", melati);
templateContext.put("ml", melati.getMarkupLanguage());
templateContext.put("object", e);
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
templateContext.put("error", sw);
templateContext.put("sysAdminName", getSysAdminName());
templateContext.put("sysAdminEmail", getSysAdminEmail());
Template errorTemplate;
errorTemplate =
melati
.getConfig()
.getTempletLoader()
.templet(
melati.getTemplateEngine(), melati.getMarkupLanguage(), "error", e.getClass());
templateEngine.expandTemplate(mw, errorTemplate, templateContext);
melati.write();
} catch (Exception f) {
System.err.println("Error finding/writing error template:");
f.printStackTrace();
super.error(melati, e);
}
}
}
protected void doPoemRequest(Melati melati) throws Exception {
ServletTemplateContext templateContext = melati.getServletTemplateContext();
// If we have an multipart form, we use a different template context
// which allows us to access the uploaded files as well as fields.
// This used to be in prePoemSession, but the use case was pretty thin,
// the main Adaptor is PoemFileFormDataAdaptor, which needs to be in session.
String contentType = melati.getRequest().getHeader("content-type");
if (contentType != null
&& contentType.length() >= 19
&& contentType.substring(0, 19).equalsIgnoreCase("multipart/form-data")) {
templateContext = new MultipartTemplateContext(melati, templateContext);
}
templateContext.put("melati", melati);
templateContext.put("ml", melati.getMarkupLanguage());
String templateName = doTemplateRequest(melati, templateContext);
// only expand a template if we have one (it could be a redirect)
if (templateName != null) {
templateName = addExtension(templateName);
templateEngine.expandTemplate(melati.getWriter(), templateName, templateContext);
}
}
/**
* Inititialise the template engine.
*
* @param config a <code>ServletConfig</code>
* @throws ServletException if the ServletTemplateEngine has a problem
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
templateEngine = melatiConfig.getServletTemplateEngine();
templateEngine.init(melatiConfig, this);
}
/**
* The template extension is added in an overridable method to allow the application developer to
* specify their own template extensions.
*
* <p>To obtain nice URLs one method is to call your templates <code>foo.html.wm</code> for
* example, your urls can then look like <code>servlet/db/table/troid/method.html</code>.
*/
protected String addExtension(String templateName) {
if (!templateName.endsWith(templateEngine.templateExtension()))
return templateName + templateEngine.templateExtension();
else return templateName;
}