Example: TreeReporter

• Recursive, pre-order traversal

• getFirstChild()

• Indexed navigation is the key

• No iterators; no siblings

import java.io.IOException;
import nu.xom.*;


public class TreeReporter {

    public static void main(String[] args) {
     
        if (args.length <= 0) {
          System.out.println("Usage: java TreeReporter URL");
          return; 
        }
         
        TreeReporter iterator = new TreeReporter();
        try {
          Builder parser = new Builder();
          
          // Read the entire document into memory
          Node document = parser.build(args[0]); 
          
          // Process it starting at the root
          iterator.followNode(document);
    
        }
        catch (IOException ex) { 
          System.out.println(ex); 
        }
        catch (ParsingException ex) { 
          System.out.println(ex); 
        }
  
    } // end main

    private PropertyPrinter printer = new PropertyPrinter();
  
    // note use of recursion
    public void followNode(Node node) throws IOException {
    
        printer.writeNode(node);
        for (int i = 0; i < node.getChildCount(); i++) {
            followNode(node.getChild(i));
        }
    
  }

}