package com.quiotix.html.example;

 import java.io.IOException;

 import java.io.OutputStream;

 import java.io.OutputStreamWriter;

 import java.io.PrintWriter;

 import java.io.UnsupportedEncodingException;

 import java.util.Iterator;

 import com.quiotix.html.parser.HtmlDocument;

 import com.quiotix.html.parser.HtmlParser;

 import com.quiotix.html.parser.HtmlVisitor;

 import com.quiotix.html.parser.ParseException;

 import com.quiotix.html.parser.HtmlDocument.Attribute;

 /** 

  * Example visitor to dump out the links from an HTML document.

  *

  * @author Brian Goetz, Quiotix

  */

 public class DumpLinks extends HtmlVisitor {

   protected PrintWriter out;

   /**

    * Constructor.

    * 

    * @param os OutputStream to dump to

    */

   public DumpLinks(OutputStream os)     { out = new PrintWriter(os); }

   /**

    * Constructor.

    * 

    * @param os OutputStream to dump to

    */

   public DumpLinks(OutputStream os, String encoding)

     throws UnsupportedEncodingException {

     out = new PrintWriter( new OutputStreamWriter(os, encoding) );

   }

   public void finish() { 

       out.flush();

   }

   public void visit(HtmlDocument.Tag t) { 

     if (t.tagName.equalsIgnoreCase("A")) {

       for (Iterator i=t.attributeList.attributes.iterator(); i.hasNext(); ) {

         Attribute a = (Attribute) i.next();

         if (a.name.equalsIgnoreCase("HREF"))

           out.println(a.getValue());

       }

     }

   }

   /**

    * Runnable.

    */

   public static void main (String args[]) throws ParseException, IOException {

     HtmlDocument document;

     document = new HtmlParser(System.in).HtmlDocument();

     document.accept(new DumpLinks(System.out));

   }

 }