Examples of org.apache.velocity.context.Context

org.apache.velocity.context.Context
Interface describing the application data context. This set of routines is used by the application to set and remove 'named' data object to pass them to the template engine to use when rendering a template. This is the same set of methods supported by the original Context class @see org.apache.velocity.context.AbstractContext @see org.apache.velocity.VelocityContext @author Jason van Zyl @author Geir Magnusson Jr. @version $Id: Context.java 291585 2005-09-26 08:56:23Z henning $

        contentType = contentType + ";charset=" + encoding;
      }
      Template t = getTemplate(stack,
          velocityManager.getVelocityEngine(), invocation,
          finalLocation, encoding);
      Context context = createContext(velocityManager, stack, request,
          response, finalLocation);
      Writer screenWriter = new StringWriter();
      response.setContentType(contentType);
      t.merge(context, screenWriter);
      context.put(KEY_SCREEN_CONTENT, screenWriter.toString());


      // ------------- 2. render the layout template -------------


      initLayoutTemplateParameters();

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                         Throwable e)
    {
        try
        {
            // get a velocity context
            Context ctx = createContext(request, response);


            Throwable cause = e;


            // if it's an MIE, i want the real cause and stack trace!
            if (cause instanceof MethodInvocationException)
            {
                // put the invocation exception in the context
                ctx.put(KEY_ERROR_INVOCATION_EXCEPTION, e);
                // get the real cause
                cause = ((MethodInvocationException)e).getWrappedThrowable();
            }


            // add the cause to the context
            ctx.put(KEY_ERROR_CAUSE, cause);


            // grab the cause's stack trace and put it in the context
            StringWriter sw = new StringWriter();
            cause.printStackTrace(new java.io.PrintWriter(sw));
            ctx.put(KEY_ERROR_STACKTRACE, sw.toString());


            // retrieve and render the error template
            Template et = getTemplate(errorTemplate);
            mergeTemplate(et, ctx, response);

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     *  @param request  HttpServletRequest object containing client request
     *  @param response HttpServletResponse object for the response
     */
    protected void doRequest(HttpServletRequest request, HttpServletResponse response)
    {
        Context context = null;
        try
        {
            // then get a context
            context = createContext(request, response);

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                h = null;
                props = bi.getPropertyDescriptors();
            }
            final DynamicPropertyHandler handler = h;
            
            this.velocityContext = new Context() {
                    public Object put(String key, Object value) {
                        if (key.equals("flowContext") 
                            || key.equals("continuation")) {
                            return value;
                        }

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        PortletConfig portletConfig = (PortletConfig) request.getAttribute(PORTLET_CONFIG);
        
        if (renderRequest != null)
        {
            renderRequest.setAttribute(VELOCITY_CONTEXT_ATTR, ctx);
            Context portletContext = (Context)renderRequest.getAttribute(GenericVelocityPortlet.PORTLET_BRIDGE_CONTEXT);
            if (portletContext != null)
            {
                // merge in portletContext
                Object[] keys = portletContext.getKeys();
                for (int ix = 0; ix < keys.length; ix++)
                {
                    // is this api f'd in the head or what
                    ctx.put((String)keys[ix], portletContext.get((String)keys[ix]));
                }                
            }
            
        }

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        super.render(request, response);
    }


    private Context createPortletVelocityContext(RenderRequest request, RenderResponse response)
    {
        Context ctx = new VelocityContext();
        request.setAttribute(PORTLET_BRIDGE_CONTEXT, ctx);
        // PLT.22
        ctx.put("renderRequest", request);
        ctx.put("renderResponse", response);
        ctx.put("portletConfig", getPortletConfig());
        // constants
        ctx.put("STATE_NORMAL", WindowState.NORMAL);
        ctx.put("STATE_MAX", WindowState.MAXIMIZED);
        ctx.put("STATE_MIN", WindowState.MINIMIZED);
        ctx.put("MODE_VIEW", PortletMode.VIEW);
        ctx.put("MODE_EDIT", PortletMode.EDIT);
        ctx.put("MODE_HELP", PortletMode.HELP);
        ctx.put("USER_INFO", PortletRequest.USER_INFO);
        return ctx;
    }

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        return (Context) request.getAttribute(PORTLET_BRIDGE_CONTEXT);
    }


    public void setupPreferencesEdit(RenderRequest request, RenderResponse response)
    {
        Context context = getContext(request);
        PortletPreferences prefs = request.getPreferences();
        Map map = prefs.getMap();
        Iterator it = map.entrySet().iterator();
        context.put("prefs", it);
        
        Map result = new HashMap(map.size());
        Iterator f = map.entrySet().iterator();
        while(f.hasNext())
        {
            Map.Entry e = (Map.Entry)f.next();
            String []why = (String[])e.getValue();
            result.put(e.getKey(), why[0]);            
        }
        context.put("prefsMap", result);
    }

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     */
    public Context render(HttpServletRequest request,
                          HttpServletResponse response) throws IOException
    {
        // then get a context
        Context context = getContext(request, response);


        // get the template
        Template template = getTemplate(request, response);


        // merge the template and context into the response

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    public Context render(HttpServletRequest request, Writer out)
        throws IOException
    {
        // then get a context
        Context context = getContext(request);


        // get the template
        Template template = getTemplate(request);


        // merge the template and context into the writer

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        {
            keys.addAll(tools.keySet());
        }


        // recurse down the velocity context collecting keys
        Context velctx = this.context.getVelocityContext();
        while (velctx != null)
        {
            Object[] ctxKeys = velctx.getKeys();
            keys.addAll(Arrays.asList(ctxKeys));
            if (velctx instanceof AbstractContext)
            {
                velctx = ((AbstractContext)velctx).getChainedContext();
            }

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