package org.llgc;

import java.io.File;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class XMLDOM
{
  public static void readXML ()
  {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance ();
    try
    {
      DocumentBuilder parser = factory.newDocumentBuilder ();
      File XFile = new File ("atelier.xml");
      Document root = parser.parse (XFile);
      NodeList childs = root.getElementsByTagName ("customers").item (0).getChildNodes ();
      for (int i = 0; i < childs.getLength (); i++)
      {
        Node node = childs.item (i);
        if ( (node.getNodeType () == org.w3c.dom.Node.ELEMENT_NODE) && (node.getNodeName ().equals ("customer")))
        {
          Element el = (Element) node;
          System.out.println (el.getAttribute ("id") + " " + el.getTextContent ());
        }
      }
    }
    catch (SAXException | IOException | ParserConfigurationException e)
    {
      e.printStackTrace ();
      return;
    }

  }

  public static void writeXML ()
  {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance ();
    try
    {
      DocumentBuilder parser = factory.newDocumentBuilder ();
      Document document = parser.newDocument ();
      Element root = document.createElement ("contacts");
      document.appendChild (root);
      String[][] contacts = { { "Dupont", "Pierre", "192.168.1.100" }, { "Dupond", "Paul", "192.168.1.101" },
          { "Ducont", "Jack", "192.168.1.102" }, { "Ducond", "Peter", "192.168.1.103" },
          { "Dutont", "Arf", "192.168.1.104" } };
      int i = 0;
      for (String[] contact : contacts)
      {
        ++i;
        Element contactXML = document.createElement ("contact");
        contactXML.setAttribute ("id", Integer.toString (i));
        Element contactNom = document.createElement ("nom");
        contactNom.setTextContent (contact[0]);
        contactXML.appendChild (contactNom);
        Element contactPrenom = document.createElement ("prenom");
        contactPrenom.setTextContent (contact[1]);
        contactXML.appendChild (contactPrenom);
        Element contactIP = document.createElement ("ip");
        contactIP.setTextContent (contact[2]);
        contactXML.appendChild (contactIP);
        root.appendChild (contactXML);
      }

      TransformerFactory transformerFactory = TransformerFactory.newInstance ();
      Transformer transformer = transformerFactory.newTransformer ();
      DOMSource source = new DOMSource (document);
      StreamResult sortie = new StreamResult (new File ("contact.xml"));

      transformer.setOutputProperty (OutputKeys.VERSION, "1.0");
      transformer.setOutputProperty (OutputKeys.ENCODING, "UTF-8");
      document.setXmlStandalone (false);
      // Ne marche pas : transformer.setOutputProperty (OutputKeys.STANDALONE,
      // "yes");

      transformer.setOutputProperty (OutputKeys.INDENT, "yes");
      transformer.setOutputProperty ("{http://xml.apache.org/xslt}indent-amount", "2");

      transformer.transform (source, sortie);
    }
    catch (ParserConfigurationException | TransformerException e)
    {
      e.printStackTrace ();
      return;
    }
  }

  public static void main (String[] args)
  {
    readXML ();
    writeXML ();
  }
}