Basically you need a permanent storage that you manage on your own (not provided by the API) to maintain the context data for each blip. That's what I meant by your own datastore to keep track of the blip ids and associated data. Take a look at the sample robot Stocky which has a persistence layer to remember blips data with JDO on AppeEngine -
http://google-wave-resources.googlecode.com/svn/trunk/samples/extensions/robots/java/stocky/src/robot/ <http://google-wave-resources.googlecode.com/svn/trunk/samples/extensions/robots/java/stocky/src/robot/> Austin On Fri, Oct 23, 2009 at 6:22 PM, Smola <callmesm...@gmail.com> wrote: > > Keeping track of the IDs for "lookup?" I have been searching for a > method in the API which takes a blip ID as an argument and returns the > blip matching that ID but have been unable to find one. Am I missing > something? Please tell me how this can be done if possible because my > development has been stalled as a result. > > > Smola > > > On Oct 23, 2:55 am, "Austin Chau (Google employee)" > <api.aus...@google.com> wrote: > > So yes, when a blip is out of context you would have no way to retrieve > its > > document content from the event callback alone. What can you do now is > > maintain the context on your own with a datastore backend. Essentially > > keeping track of all wavelet and blip ids for lookup. > > We know that this is not ideal and we are working on this as speak to > remove > > the limited context on callback. Stay tuned for updates. > > Austin > > > > 2009/10/22 Bálint Kriván <bal...@google.com> > > > > > > > > > Oh I see...So robot doesn't get the whole wavelet with all of the > blips, > > > but the blip of the related event and it's parent. > > > Ok, but if I would like to access to the rootblip, and I get its id > with > > > wavelet.getRootBlipId(), how can I request its content > > > (getDoucment().getText())? > (wavelet.getRootBlip().getDocument().getText() > > > also throws null exception in these cases, so I don't have any idea how > to > > > achieve this) > > > > > Thanks for your guidance! > > > > > On Fri, Oct 23, 2009 at 2:56 AM, Austin Chau (Google employee) < > > > api.aus...@google.com> wrote: > > > > >> Hi, > > >> To get the root blip id in your scenario - > > > > >> wave.appendBlip().getDocument().append(wavelet.getRootBlipId()); > > > > >> This would work because it does not require "context" of a grandparent > > >> blip. The reason that you are getting exception is because the > context > > >> associated with an event callback only goes back its immediate parent. > So > > >> in your case if the triggering event is resulted from a grandchild > blip away > > >> from root, it will no longer has context to recreate the root blip > when you > > >> invoked wavelet.getRootBlip() - thus you will get a null reference. > > > > >> Hope it helps, > > >> Austin > > > > >> 2009/10/22 Bálint Kriván <bal...@google.com> > > > > >> Reply to myself and others: I think this is related to > > >>>http://code.google.com/p/google-wave-resources/issues/detail?id=200. > > > > >>> 2009/10/22 Bálint Kriván <bal...@krivan.info> > > > > >>> Hi! > > >>>> I have this little chunk of code: > > > > >>>> public void debug(RobotMessageBundle bundle, String msg) > > > > >>>> { > > > > >>>> List<String> list = new ArrayList(); > > > > >>>> list.add("<myaddress in google wave>"); > > > > >>>> Wavelet wave = bundle.createWavelet(list); > > > > >>>> wave.appendBlip().getDocument().append(msg); > > > > >>>> } > > > > >>>> @Override > > > > >>>> public void processEvents(RobotMessageBundle robotMessageBundle) { > > > > >>>> Wavelet wavelet = robotMessageBundle.getWavelet(); > > > > >>>> for (Event event : robotMessageBundle.getEvents()) { > > > > >>>> Blip currentBlip = event.getBlip(); > > > > >>>> switch (event.getType()) { > > > > >>>> case BLIP_SUBMITTED: > > > > >>>> debug(robotMessageBundle, > > >>>>> String.valueOf(wavelet.getRootBlip().getBlipId())); // line 46! > > > > >>>> } > > > > >>>> } > > > > >>>> } > > > > >>>> So when I add a blip to the wavelet where the robot is, it should > open a > > >>>> new wave with me and send the id of the root blip (The top blip in > the > > >>>> wavelet). > > >>>> But if this blip isn't right after the root blip (so the very first > > >>>> Reply button) then I've got a NullPointerException: > > > > >>>> java.lang.NullPointerException > > > > >>>> at com.google.wave.api.impl.BlipImpl.getBlipId(BlipImpl.java:56) > > > > >>>> at robot.MainServlet.processEvents(MainServlet.java:46) > > > > >>>> at > > >>>>> > com.google.wave.api.AbstractRobotServlet.doPost(AbstractRobotServlet.java:8 > 9) > > > > >>>> [...] > > > > >>>> What is the recommended way to access the very first blip (which is > I > > >>>> guess the RootBlip)? > > > > >>>> Thanks for your help! > > > > >>>> -- > > >>>> Üdv, > > >>>> Kriván Bálint > > > > >>> -- > > >>> Üdv, > > >>> Kriván Bálint > > > > > -- > > > Üdv, > > > Kriván Bálint > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Wave API" group. To post to this group, send email to google-wave-api@googlegroups.com To unsubscribe from this group, send email to google-wave-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-wave-api?hl=en -~----------~----~----~----~------~----~------~--~---
