4.4 Structural Events

The ContentHandler interface requests the following structural-oriented methods.

startDocument()
endDocument()
startElement(String namespaceURI, String localName, String qName, Attributes atts)
endElement(String namespaceURI, String localName, String qName)

<..a handler for SAX structural events ..>

class MyContentHandler extends DefaultHandler {
     int level=0;
     String docName;

   MyContentHandler( String arg0 ){ docName = arg0; }

   public void startDocument(){
     System.out.println( docName );
   }

   public void startElement(String ns, String sname,
                           String qName, Attributes atts) {
         int i;
      level += 1;
      for(i=0; i<level; i++ ){ System.out.print( "  |"); }
      System.out.println();
      for(i=1; i<level; i++ ){ System.out.print( "  |"); }
      System.out.println( "  +-" + qName );
   }

   public void endElement(String ns, String sname, String qName){
      level -= 1;
   }
}

-_-_-

<?xml version="1.0" encoding="UTF-8"?>
<document title="red" canvas="yellow">
  <section>
    <title>First section</title>
    <sentence>Some text.</sentence>
    <sentence>More text.</sentence>
  </section>
  <section>
    <title>Second section</title>
    <sentence>Another text.</sentence>
    <sentence>Yet more text.</sentence>
  </section>
</document>

<..SAXStruct.java ..>

import java.io.File;
import javax.xml.parsers.*;
import org.xml.sax.Attributes;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

class SAXStruct {
   public static void main(String[] args) throws Exception {
     SAXParserFactory factory = SAXParserFactory.newInstance();
     SAXParser saxParser = factory.newSAXParser();
     XMLReader xmlReader = saxParser.getXMLReader();
     xmlReader.setContentHandler( new MyContentHandler( args[0] ) );
     xmlReader.parse( new File(args[0]).toURL().toString() );
} }
<.a handler for SAX structural events .>

javac SAXStruct.java; java SAXStruct doc.xml -_-_-

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