Create RESTful Applications - JavaFX: Developing Rich Internet Applications - page 268

bis.close();
}
else {
println("failure = {rtd.failureText}");

}
rtd = null;
}
};
}

When the requestData function is called, the act of creating a new RemoteText-
Document instance with a valid URL starts the request process. When a document
has been received successfully, the data is read in as a ByteArrayInputStream
as it would with Java, and this step is complete. At this point, it doesn't matter
what the response type is; the job of the RemoteTextDocument class is to get the
document to you.
However, if the returned document is XML or JSON, you'll need to parse it to
make use of it. This is where the PullParser class (see Figure 10.3) comes in,
which is called in Listing 10.4, highlighted in bold type. There's some more code
behind this that you need to provide, such as the code in Listing 10.5. It begins
with a custom class, Location , since this code illustrates parsing location data as
received from Yahoo! Web Services.

javafx.data.pull.PullParser

+forward()
+forward(integer)
+parse()
+seek(object)
+seek(object,integer)
+toString()

Figure 10.3 The PullParser Class

The real work begins with the object, parser , which is an instance of the Pull-
Parser class. It begins parsing as soon as its input object is set and the parse
method is called. Because it's bound to the ByteInputStream object bis from
Listing 10.4, it has access to the data as soon as the RemoteTextData object pop-
ulates it. It's this bound variable that allows the code in Listing 10.4 (which
requests data from a remote server) to cooperate with the code in Listing 10.5
(which parses the received JSON document).