The difference is that it can handle the view based scopes where the primefaces impl can't. But as I just realize this won't help you at all. Sorry but for now I can't think of a reliable general purpose way to retrieve the contents without rebuilding the view, I have to think about it. Do you need any context information like iteration status or so to evaluate the expression to a meaningful value or is it completely independent of the view? What scope has the myController?
2013/5/13 Thomas Andraschko <[email protected]> > Hi Christian, > > i don't understand your solution exactly. > Whats the difference? > It would still store the #{cc.attrs.xxx} expression and #{cc} cant be > evaluated without #pushComponentToEL(cc). > Also #createView should be avoided for such a request IMO because of > performance. > > Regards, > Thomas > > > > > 2013/5/13 Christian Beikov <[email protected]> > > > I'd rather say this should be fixed by restoring the view before > accessing > > the expression. I have done something like that for > > DynamicContentResourceHandler which probably is used in this case here > too. > > Basically you need to save the viewId and the expression together in the > > session so you are able to restore the adequate expression in the > resource > > handler. I did the following for GraphicImageRenderer: > > > > > > @Override > > protected String getImageSrc(FacesContext context, GraphicImage > image) > > { > > String src = null; > > String name = image.getName(); > > > > if(name != null) { > > String libName = image.getLibrary(); > > ResourceHandler handler = > > context.getApplication().getResourceHandler(); > > Resource res = handler.createResource(name, libName); > > > > if(res == null) { > > return "RES_NOT_FOUND"; > > } else { > > return > > context.getExternalContext().encodeResourceURL(res.getRequestPath()); > > } > > } else { > > Object value = image.getValue(); > > > > if (value == null) { > > return ""; > > } else if(value instanceof String) { > > src = getResourceURL(context, (String) value); > > } else if (value instanceof StreamedContent) { > > ViewHandler viewHandler = > > context.getApplication().getViewHandler(); > > StreamedContent streamedContent = (StreamedContent) > value; > > Resource resource = > > > > > context.getApplication().getResourceHandler().createResource("dynamiccontent", > > "primefaces", streamedContent.getContentType()); > > String resourcePath = resource.getRequestPath(); > > > > // servlet path/prefix is added already in > > ViewHandler.getActionURL so remove it here > > resourcePath = > > resourcePath.substring(resourcePath.indexOf("/javax.faces.resource/")); > > resourcePath = viewHandler.getActionURL(context, > > resourcePath); > > > > String rid = createUniqueContentId(context); > > StringBuilder builder = new StringBuilder(resourcePath); > > > > if(resourcePath.contains("?")) > > builder.append("&"); > > else > > builder.append("?"); > > > > > > > > > builder.append(DynamicContentResourceHandler.DYNAMIC_CONTENT_PARAM).append("=").append(rid); > > builder.append("&").append("ln=primefaces"); > > > > for (UIComponent kid : image.getChildren()) { > > if (kid instanceof UIParameter) { > > UIParameter param = (UIParameter) kid; > > > > > > > > > builder.append("&").append(param.getName()).append("=").append(param.getValue()); > > } > > } > > > > src = builder.toString(); > > Map<String, String> dynamicContentMap = new > HashMap<String, > > String>(); > > > > > > > dynamicContentMap.put(DynamicContentResourceHandler.DYNAMIC_CONTENT_VALUE_EXPRESSION_KEY, > > image.getValueExpression("value").getExpressionString()); > > > > > > > dynamicContentMap.put(DynamicContentResourceHandler.DYNAMIC_CONTENT_VIEW_ID_KEY, > > context.getViewRoot().getViewId()); > > > > context.getExternalContext().getSessionMap().put(rid, > > dynamicContentMap); > > } > > > > // Add caching if needed > > if (!image.isCache()) { > > src += src.contains("?") ? "&" : "?"; > > src = src + "primefaces_image=" + > > UUID.randomUUID().toString(); > > } > > > > } > > > > return src; > > } > > > > > > And then I have the DynamicContentResourceHandler: > > > > public class DynamicContentResourceHandler extends PrimeResourceHandler{ > > > > private final static Logger logger = > > Logger.getLogger(DynamicContentResourceHandler.class.getName()); > > > > public static final String DYNAMIC_CONTENT_VIEW_ID_KEY = "viewId"; > > public static final String DYNAMIC_CONTENT_VALUE_EXPRESSION_KEY = > > "valueExpression"; > > public static final String DYNAMIC_CONTENT_PARAM = "pfdrid"; > > > > public DynamicContentResourceHandler(ResourceHandler wrapped) { > > super(wrapped); > > } > > > > @Override > > public void handleResourceRequest(FacesContext context) throws > > IOException { > > Map<String,String> params = > > context.getExternalContext().getRequestParameterMap(); > > String library = params.get("ln"); > > String dynamicContentId = params.get(DYNAMIC_CONTENT_PARAM); > > > > if(dynamicContentId != null && library != null && > > library.equals("primefaces")) { > > Map<String,Object> session = > > context.getExternalContext().getSessionMap(); > > StreamedContent content = null; > > > > try { > > @SuppressWarnings("unchecked") > > Map<String, String> dynamicContentMap = (Map<String, > > String>) session.get(dynamicContentId); > > > > if(dynamicContentMap != null){ > > String viewId = > > dynamicContentMap.get(DYNAMIC_CONTENT_VIEW_ID_KEY); > > String dynamicContentEL = > > dynamicContentMap.get(DYNAMIC_CONTENT_VALUE_EXPRESSION_KEY); > > > > // Workaround for view based scopes > > > > > > > context.setViewRoot(context.getApplication().getViewHandler().createView(context, > > viewId)); > > > > ELContext eLContext = context.getELContext(); > > ValueExpression ve = > > > > > context.getApplication().getExpressionFactory().createValueExpression(context.getELContext(), > > dynamicContentEL, StreamedContent.class); > > content = (StreamedContent) ve.getValue(eLContext); > > > > ExternalContext externalContext = > > context.getExternalContext(); > > > > externalContext.setResponseStatus(HttpServletResponse.SC_OK); > > > > externalContext.setResponseContentType(content.getContentType()); > > > > byte[] buffer = new byte[2048]; > > > > int length; > > InputStream inputStream = content.getStream(); > > > > while ((length = (inputStream.read(buffer))) >= 0) { > > > > externalContext.getResponseOutputStream().write(buffer, 0, length); > > } > > > > externalContext.getResponseOutputStream().flush(); > > context.responseComplete(); > > } else { > > ExternalContext externalContext = > > context.getExternalContext(); > > > > externalContext.setResponseStatus(HttpServletResponse.SC_NOT_FOUND); > > externalContext.getResponseOutputStream().flush(); > > context.responseComplete(); > > } > > } catch(Exception e) { > > logger.log(Level.SEVERE, "Error in streaming dynamic > > resource.", e); > > } finally { > > session.remove(dynamicContentId); > > > > if(content != null) { > > content.getStream().close(); > > } > > } > > } > > else { > > super.handleResourceRequest(context); > > } > > } > > > > } > > > > This at least works for me, hope it can help you too. > > > > > > 2013/5/13 Thomas Andraschko <[email protected]> > > > > > Hi Kito, > > > > > > CC: > > > > > > > > > ---------------------------------------------------------------------------------------------------------------- > > > <composite:interface> > > > <composite:attribute name="pdfStream" > > > type="org.primefaces.model.StreamedContent" required="true" /> > > > </composite:interface> > > > > > > <composite:implementation> > > > <p:media value="#{cc.attrs.pdfStream}" width="100%" > > height="600px" > > > player="pdf"/> > > > </composite:implementation> > > > > > > > > > ---------------------------------------------------------------------------------------------------------------- > > > > > > View: > > > > > > > > > ---------------------------------------------------------------------------------------------------------------- > > > <cc:myCC pdfStream="#{reportController.report} /> > > > > > > > > > ---------------------------------------------------------------------------------------------------------------- > > > > > > PF receives the Expression String via: > > > > > > > > > ---------------------------------------------------------------------------------------------------------------- > > > media.getValueExpression("value").getExpressionString(); > > > > > > > > > ---------------------------------------------------------------------------------------------------------------- > > > > > > If it should work inside a CC, we must receive "#{cc.attrs.pdfStream}" > > > instead of "#{cc.attrs.pdfStream}". > > > > > > How can get the real expression here? > > > > > > Thanks, > > > Thomas > > > > > > > > > 2013/5/13 Kito Mann <[email protected]> > > > > > > > Hello Thomas, > > > > > > > > I think this is doable. Can you send us your composite component > code? > > > > > > > > ___ > > > > > > > > Kito D. Mann | @kito99 | Author, JSF in Action > > > > Virtua, Inc. | http://www.virtua.com | JSF/Java EE training and > > > consulting > > > > http://www.JSFCentral.com - JavaServer Faces FAQ, news, and info | > > > > @jsfcentral > > > > +1 203-998-0403 > > > > > > > > * JSF2 in Action Course - 6/17 - London: > > > > http://skillsmatter.com/course/home/jsf-and-ajax/ng-6708 > > > > * Listen to the Enterprise Java Newscast: * > > > > http://blogs.jsfcentral.com/JSFNewscast/ > > > > * > > > > * JSFCentral Interviews Podcast: > > > > http://www.jsfcentral.com/resources/jsfcentralpodcasts/ > > > > * Sign up for the JSFCentral Newsletter: > > > > http://oi.vresp.com/?fid=ac048d0e17 > > > > > > > > > > > > On Mon, May 13, 2013 at 7:17 AM, Thomas Andraschko < > > > > [email protected]> wrote: > > > > > > > > > Hi, > > > > > > > > > > is it possible unwrap a CC ValueExpresion? > > > > > i found a bug with PrimeFaces p:media inside a composite component > > and > > > i > > > > > would like to fix it. > > > > > > > > > > If you pass the EL via a CC attr (e.g. #{myController.content}) and > > > > attach > > > > > it to p:media (e.g. #{cc.attrs.content}), > > > > > p:media gets the ValueExpression and saves them in the session, to > > > later > > > > > stream the content in a resource request. > > > > > Later the ResourceHandler evaluates it and tries to get the value > of > > > > > #{cc.attrs.content}, which can't work ofc. > > > > > > > > > > So is it possible to extract the "real" EL before store it in the > > > > session? > > > > > Is there a solution which also works in mojarra? > > > > > > > > > > > > > > > Regards, > > > > > Thomas > > > > > > > > > > > > > > > > > > > > -- > > <br/> > > <br/> > > Mit freundlichen Grüßen,<br/> > > <hr/> > > <b>Christian Beikov</b><br/> > > Blazebit Design & Developing<br/> > > <a href="http://www.blazebit.com";>http://www.blazebit.com</a><br/> > > > -- <br/> <br/> Mit freundlichen Grüßen,<br/> <hr/> <b>Christian Beikov</b><br/> Blazebit Design & Developing<br/> <a href="http://www.blazebit.com";>http://www.blazebit.com</a><br/>
