Internet.java

package br.ufpr.c3sl.connection;

import java.sql.Connection;

import javax.swing.JOptionPane;

import br.ufpr.c3sl.daoFactory.DAOFactory;
import br.ufpr.c3sl.daoFactory.MysqlDAOFactory;
import br.ufpr.c3sl.session.Session;
import br.ufpr.c3sl.view.principal.JpCarrie;

public class Internet {

	/**
	 * Checks if there is Internet connection
	 * through dummy request
	 * @return false if there is no connection with the internet
	 * 		   true if there is connection with tehe internet 	
	 */
	public static boolean isReachable()
	{
		
	Connection c = MysqlDAOFactory.createConnection();
	
	if (c == null) return false; else return true; 
	
//		try {
//			//make a URL to a known source
//			URL url = new URL("http://www.google.com");
//			//URL url = new URL("http://localhost");
//
//			//open a connection to that source
//			HttpURLConnection urlConnect = (HttpURLConnection)url.openConnection();
//
//			//trying to retrieve data from the source. If there
//			//is no connection, this line will fail
//			Object objData = urlConnect.getContent();
//			System.out.println(objData);
//		} catch (UnknownHostException e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//			return false;
//		}
//		catch (IOException e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//			return false;
//		}
//		return true;
	}

	/**
	 * Checks if there is Internet connection
	 * @return true if there is no connection with the internet
	 * 		   false if there is connection with tehe internet 	
	 */
	public static boolean isNotReachable(){
		return !isReachable();
	}

	/**
	 * Checks if there is Internet connection
	 * And change the execution mode to local if 
	 * there is no  internet connection
	 */
	public static void verifyConnection(){
		verify("Sua conexão com a internet foi perdida, " + 
				"\nCom isso, o modo de execução foi mudado para Local, quando a \nconexão for reestabelicida " +
				"\nenvie os dados para servidor através do botão enviar \nque está barra de menu.");
	}
	
	/**
	 * Checks if there is Internet connection
	 * And change the execution mode to local if 
	 * there is no  internet connection
	 * @param msg The message that will be showed if there is no connection
	 */
	public static void verifyConnection(String msg){
		verify(msg);
	}
	
	private static void verify(String msg){
		if(DAOFactory.DATABASE_CHOOSE == DAOFactory.MYSQL && Internet.isNotReachable()){
			DAOFactory.DATABASE_CHOOSE = DAOFactory.DB4O;
			Session.setMode("Local");
			JpCarrie.getInstance().updateHeader();
			JOptionPane.showMessageDialog(null, msg);
		}
	}
}