Stax 2 1 validating

31-Oct-2019 08:16

Finally, you cannot "back up" to an earlier part of the document, or rearrange it, any more than you can back up a serial data stream or rearrange characters you have read from that stream.

For those reasons, developers who are writing a user-oriented application that displays an XML document and possibly modifies it will want to use the DOM mechanism described in Chapter 3, Document Object Model.

Setting up a program to use SAX requires a bit more work than setting up to use the Document Object Model (DOM).

SAX is an event-driven model (you provide the callback methods, and the parser invokes them as it reads the XML data), and that makes it harder to visualize.

The details of that process are highlighted in When to Use DOM in the next chapter.

For simpler applications, that complexity may well be unnecessary.

This section examines an example JAXP program, , are needed to provide hash tables and output.

The first order of business is to process the command-line arguments, which at this stage only serve to get the name of the file to process.

stax 2 1 validating-64

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Note - In a nutshell, SAX is oriented towards state independent processing, where the handling of an element does not depend on the elements that came before.

The following code handles the start-document and end-document events: public class SAXLocal Name Count extends Default Handler { private Hashtable tags; public void start Document() throws SAXException [...] public void end Document() throws SAXException private static String convert To File URL(String filename) { [...] method is invoked, to get the names and counts of the elements contained in the hash table, and print out a message onscreen to tell the user how many incidences of each element were found.

Both of these public void start Document() throws SAXException public void start Element(String namespace URI, String local Name, String q Name, Attributes atts) throws SAXException public void end Document() throws SAXException method defined in Setting Up I/O.

Pull parsers and the SAX API both act like a serial I/O stream.

stax 2 1 validating-25

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You see the data as it streams in, but you cannot go back to an earlier position or leap ahead to a different position.

You could start using your parser now, but it is safer to implement some error handling.

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