Working with Data - JavaFX 1.2 Application Development - page 210

How it works...
In this example, the code retrieves weather information from Yahoo Weather as RSS-encoded
data. The steps needed to process RSS feeds are similar to those used in XML processing
(see previous recipe). Let's examine how this is done:
F Model the weather —the first item listed is the definition of class Weather .
It models the weather information that will be transferred from the server.
A script-level instance of Weather is assigned to variable weather , which
will be used to store information extracted from the RSS feed in function
loadRssInfo() (see next bullet).
F Retrieving RSS data —function loadRssInfo(zip:String) encapsulates the code
necessary to send a request to the feeds server and process the response. To do this,
it declares an instance of RssTask , which is part of JavaFX's Feeds API.
RssTask uses the PullParser API internally to process RSS feeds.
Therefore, it is an event-based parser that raises parsing events as
the document is streamed from its source. To use the RssTask , you
first set the location property to point to the RSS resource that
you want to request. Property onForeignEvent is used to specify
a callback function to handle streaming events used to extract
weather information encoded in non-standard RSS tags, as is done
in the Yahoo Weather format.
The same strategy used when processing XML in the previous recipe is used
here. The code sets up a chain of if expressions designed to test when an expected
element is encountered. When that happens, the code then retrieves the RSS
element's attribute value, as shown in the following code snippet that retrieves
attribute "speed" from element "wind" . The retrieved value is then assigned
to the weather object.
if( event.type == PullParser.END_ELEMENT and
event.qname.name.equals(" wind ")){
weather.windSpeed=event.getAttributeValue("speed")
}