Java Tips - Converting from JDOM to SAX (supported in JDOM 1.9)

In order to increase performance of conversion we can use JDOM to SAX tools. This is based on the same handler-mechanism and ordinary SAX offers except the fact that we have JDOM tree objects instead of a source XML file.

Besides, such approach could be used for traversing the JDOM tree with help of SAX handler interface. Sample below shows this convertion:


import org.jdom.Document;

import org.jdom.input.DOMBuilder;



import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;



/**

 * This sample program showing how it is easy to convert

 * from JDOM contents to the flow of SAX-parser events.

 */



public class Test {

    public static void main(String[] args) {

        try {

            // load the document from a file:

            DOMBuilder builder = new DOMBuilder(false);

            Document document = builder.build(

                    new java.io.File("sample.xml"));

            

            // create JDOM output producing SAX events:

            SAXOutputter output = new SAXOutputter(new SaxHandler());

            // here we'll activate out SAX handler:

            output.output(document);

            

        } catch (Exception ex) {

            ex.printStackTrace();

        }

    }

    

    // out SAX-handler for listennind SAX to DOM convertion:

    private static final class SaxHandler extends DefaultHandler {

        // ...

        

        // we enter to element 'qName':

        public void startElement(String uri, String localName,

                String qName, Attributes attrs) throws SAXException {

            // ...

        }

        

        // ...

    }

}

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