IEngineServiceView engine,
IRequestCycle cycle,
ResponseOutputStream output)
throws ServletException, IOException
{
IDirect direct;
int count = 0;
String componentPageName;
IPage componentPage;
RequestContext requestContext = cycle.getRequestContext();
String[] serviceContext = getServiceContext(requestContext);
if (serviceContext != null)
count = serviceContext.length;
if (count != 3 && count != 4)
throw new ApplicationRuntimeException(
Tapestry.getMessage("DirectService.context-parameters"));
boolean complex = count == 4;
int i = 0;
String stateful = serviceContext[i++];
String pageName = serviceContext[i++];
if (complex)
componentPageName = serviceContext[i++];
else
componentPageName = pageName;
String componentPath = serviceContext[i++];
IPage page = cycle.getPage(pageName);
cycle.activate(page);
if (complex)
componentPage = cycle.getPage(componentPageName);
else
componentPage = page;
IComponent component = componentPage.getNestedComponent(componentPath);
try
{
direct = (IDirect) component;
}
catch (ClassCastException ex)
{
throw new ApplicationRuntimeException(
Tapestry.format("DirectService.component-wrong-type", component.getExtendedId()),
component,
null,
ex);
}
// Check for a StateSession only the session was stateful when
// the Gesture was created.
if (stateful.equals(STATEFUL_ON) && direct.isStateful())
{
HttpSession session = cycle.getRequestContext().getSession();
if (session == null || session.isNew())
throw new StaleSessionException(
Tapestry.format(
"DirectService.stale-session-exception",
direct.getExtendedId()),
direct.getPage());
}
Object[] parameters = getParameters(cycle);
cycle.setServiceParameters(parameters);
direct.trigger(cycle);
// Render the response. This will be the response page (the first element in the context)
// unless the direct (or its delegate) changes it.
engine.renderResponse(cycle, output);