//autor J. Santolaya 2008
//http://joanju.info

import java.io.IOException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import javax.xml.xpath.*;
import javax.xml.parsers.*;

public class XPathSample {
	
	public static void main(String[] args){
	
	try {
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		factory.setNamespaceAware(true);
		DocumentBuilder builder;
	
		builder = factory.newDocumentBuilder();
		Document document = builder.parse("libros.xml");
		
		//create a XPath factory
		XPathFactory xfactory = XPathFactory.newInstance();
		//create a XPath object thanks to XPath factory
		XPath xpath = xfactory.newXPath();
		//now we need an expression to compile thanks to the xpath object
		XPathExpression expression = xpath.compile("//libro");
		//evaluate the expression,we need the document and all the NODESET
		Object obj = expression.evaluate(document, XPathConstants.NODESET);
		//to find all the titles we can iterate throw a DOM Nodelist
		NodeList nodes = (NodeList) obj;
		
		for(int i=0; i<nodes.getLength();i++) {
			System.out.println(nodes.item(i).getAttributes().getNamedItem("year").getTextContent());
			System.out.println(document.getElementsByTagName("titulo").item(i).getTextContent());
		}
		
		
	} catch (ParserConfigurationException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (SAXException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (XPathExpressionException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	
	
	
	
	
	}

}