public void service()

in tapestry-framework/src/org/apache/tapestry/engine/DirectService.java [94:175]
60 lines of code
11 McCabe index (conditional complexity)

    public void service(
        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);
    }