wavelet.appendBlip("ID") doesn't set DataDocument

[atarno]

hey all,

i've noticed that when i run the following:

wavelet.appendBlip("ID") ;
String id = wavelet.getDataDocument("ID");

id is null.

but when i do this:

Blip initBlip = wavelet.appendBlip();
wavelet.setDataDocument("ID", initBlip.getBlipId());
String id = wavelet.getDataDocument("ID");

id gets the expected value of newly created blip id.

should not the two pieces of code above return the same value of id?

thanks.

[pamela (Google employee)]

Hi Atarno -

In the first bit of code, you never set the data document, so I would
expect it to be null. Why were you expecting it to give a value?
(Maybe I'm missing something).

- pamela

[atarno]

hi pamela,
thanks for you reply.
actually, i was expecting the behavior i described above after reading
the following in the api (http://wave-robot-java-client.googlecode.com/
svn/trunk/doc/com/google/wave/api/Wavelet.html):

Blip appendBlip(java.lang.String writeBackDataDocument)
Creates a new blip and appends it to the end of the wavelet. The
resulting blip id of the new blip will be stored in a data document on
the wavelet whose event was being processed at the time the blip was
created.
Parameters:
writeBackDataDocument - The name of the data document to
create.
Returns:
the newly created blip.

there is a chance i'm the one missing something here :)
thanks again, and happy new year.

On Dec 31, 1:13 am, "pamela (Google employee)" <pamela....@gmail.com>
wrote:

[pamela (Google Employee)]

Ah. I believe it means that the new ID will be stored there *after*
the operation has been processed.

The API doesn't know the actual ID of the blip until after the
operations are sent to the server, and just gives you a temporary ID.
The server then puts a datadocument of the new ID in the wavelet, so
that you can retrieve it after a DOCUMENT_CHANGED event.

I have used a similar technique to find out the ID of a new wave (see:
http://wave-samples-gallery.appspot.com/about_app?app_id=60017), I
haven't used it to find out the ID of a new blip. I imagine it is the
same technique.

- pamela

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