RSF Discussions Forum

Is there an example of a DataView that uses a JSONProvider? Is there another class that I need to implement to define the way in which an object gets serialized or deserialized?

Maybe my question is actually about SAXalizerMappingContext. Is there an example that demonstrates creation and/or configuration of a SAXalizerMappingContext?

And on a sidenote: The class I need to serialize already has methods for converting to JSON and from JSON. In that case, do I bypass the JSON Provider? Or maybe implement SerializationProvider with calls to my class's toJSON and fromJSON methods?

Yes, a DataView can just return a String... which you could construct by injecting and invoking the JSONProvider, or otherwise.

An example of a DataView, which for certain reasons needs to take complete charge of its serialisation can be seen at https://source.sakaiproject.org/contrib/whitman/timeline/trunk/tool/src/java/org/sakaiproject/timeline/tool/producers/TimelineEventJSONProducer.java

A straightforward way of adjusting serialization, whilst continuing to use the framework's facilities, is to return a "flattened" data representation consisting of Maps of Lists etc.

Yours,
A.

I've looked at a couple examples of DataView impl's that report content type of JSON, including the one Antranig mentioned above. They also return VIEW_ID for getViewID(). In this case, VIEW_ID is "EventsJSON.js". I see no file named "EventsJSON.js" in this project. There's another example in the wiki at this URL:

http://rsf.fluidproject.org/wiki/Wiki.jsp?page=DataViews

In that one, the VIEW_ID is "catalog". Again I see no templates or javascript files with names beginning in "catalog". I'm trying to return a JSON object. My DataView uses "UBookOfferResult" as the VIEW_ID returned by getViewID(). When I run, I get a stack trace that seems to indicate that RSF is looking for an HTML template:

WARN: Error invoking action (2009-03-09 16:38:18,952 http-8080-Processor21_PonderUtilCore)
Target exception of class uk.org.ponder.rsf.flow.errors.SilentRedirectException
Successive lines until stack trace show causes progressing to exception site:
No ViewComponentProducer is registered for view UBookOfferResult
uk.org.ponder.rsf.flow.errors.SilentRedirectException
at uk.org.ponder.rsf.view.support.ConcreteViewResolver.getUnmappedProducers(ConcreteViewResolver.java:114)
at uk.org.ponder.rsf.view.support.ConcreteViewResolver.getProducers(ConcreteViewResolver.java:129)
at uk.org.ponder.rsf.flow.support.ARI2Processor.accreteViewARIs(ARI2Processor.java:4
at uk.org.ponder.rsf.flow.support.ARI2Processor.interceptActionResult(ARI2Processor.java:40)

followed by:

WARN: Exception rendering view: (2009-03-09 16:38:18,979 http-8080-Processor21_PonderUtilCore)
Target exception of class java.lang.IllegalArgumentException
Successive lines until stack trace show causes progressing to exception site:
Error setting dependency viewRender of bean RSFRenderHandler
--> Error setting dependency viewTemplate of bean viewRender
--> No template found for view UBookOfferResult: tried paths (expected) /templates/sakai-UBookOfferResult.html, /templates/UBookOfferResult.html, classpath:uk/org/ponder/rsf/builtin/templates/sakai-UBookOfferResult.html, classpath:uk/org/ponder/rsf/builtin/templates/UBookOfferResult.html, /component-templates/Messages.html, /component-templates/UBookOfferDetails.html, /component-templates/PriceHelper.html, /content/templates/old-date.html, /content/templates/yahoo-date.html, /content/templates/plainTextEditor.html, /content/templates/plainSelect.html, /content/templates/double-list-select.html, /content/templates/dynamic-list-input.html, /content/templates/TableWidgets.html, /content/templates/sakai-old-date.html, /content/templates/sakai-FCKEditor.html, /content/templates/sakai-plainTextEditor.html, /content/templates/sakai-rsf-portal.html, from all TemplateResolverStrategy which were marked as a root resolver (rootPriority > 0)
java.lang.IllegalArgumentException
at uk.org.ponder.rsf.templateresolver.support.BasicTemplateResolver.locateTemplate(BasicTemplateResolver.java:157)
at uk.org.ponder.rsf.templateresolver.support.TemplateLoaderBean.getObject(TemplateLoaderBean.java:32)
at uk.org.ponder.rsac.support.RSACBeanLocatorImpl.createBean(RSACBeanLocatorImpl.java:576)
at uk.org.ponder.rsac.support.RSACBeanLocatorImpl.getLocalBean(RSACBeanLocatorImpl.java:34

It seems pretty clear that I am doing something wrong. I've tried to follow the example discussed in the wiki, but I'm missing some key point.

Thanks. Jim

BTW, the actual object returned by getData(ViewParameters) in my class is a Map<String,String>.

DataViews do not require templates to be present. Have you made sure to register your DataView in a context file?

Suppose I have a class that implements DataView and DataInputHandler, similar to the Catalog example of the JSONCatalogView example. When the client posts to this view, what should happen? I was thinking that the handleInput() method would be called and then the getData() method would be called.

When this class implemented just DataView, the getData() method was called. But since I added DataInputHandler, the handleInput() method gets called and getData() does not. That results in a null return to the client-side javascript callback function.

Is there something special I need to do?

Thanks.

Jim

I think we resolved this privately by deciding that the proper semantics were to follow a POST explicitly with a GET? If this is still a problem, please could you post back?

Cheers,
Boz.