import java.util.*;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.io.file.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class FileMidlet extends MIDlet implements CommandListener
{
private String currDirName;

private Command view = new Command("View", Command.ITEM, 1);
private Command back = new Command("Back", Command.BACK, 2);
private Command exit = new Command("Exit", Command.EXIT, 3);

private final static String UP_DIRECTORY = "..";
private final static String MEGA_ROOT = "/";
private final static String SEP_STR = "/";
private final static char?? SEP = '/';

public FileMidlet()
{
??? currDirName = MEGA_ROOT;
}

public void startApp()
{
??? boolean isAPIAvailable = false;
??? if (System.getProperty(
????? "microedition.io.file.FileConnection.version") != null)
??? {
????? isAPIAvailable = true;
????? try
????? {
??????? showCurrDir();
????? }
????? catch (SecurityException e)
????? {}
????? catch (Exception e) {}
????? }
??? else
??? {
????? StringBuffer splashText = new StringBuffer(
??????? getAppProperty("MIDlet-Name")).append("\n").append(
??????? getAppProperty("MIDlet-Vendor")).
??????? append(isAPIAvailable?"":"\nFileConnection API not available");
????? Alert splashScreen = new Alert(null,splashText.toString(),
??????? null,AlertType.INFO);
????? splashScreen.setTimeout(3000);
????? Display.getDisplay(this).setCurrent(splashScreen);
??? }
???
}

public void pauseApp() {}

public void destroyApp(boolean cond)
{
??? notifyDestroyed();
}

public void commandAction(Command c, Displayable d)
{
??? if (c == view)
??? {
????? List curr = (List)d;
????? final String currFile = curr.getString(curr.getSelectedIndex());
????? System.out.println(currFile);
????? new Thread(new Runnable()
????? {
??????? public void run()
??????? {
????????? if (currFile.endsWith(SEP_STR) ||
??????????? currFile.equals(UP_DIRECTORY))
????????? {
??????????? traverseDirectory(currFile);
????????? } else
????????? {
??????????? showFile(currFile);
????????? }
??????? }
????? }).start();
??? }
??? else if (c == back)
??? {
????? showCurrDir();
??? }
??? else if (c == exit)
??? {
????? destroyApp(false);
??? }
}

void showCurrDir()
{
??? Enumeration e;
??? FileConnection currDir = null;
??? List browser;
??? try
??? {
????? if (MEGA_ROOT.equals(currDirName))
????? {
??????? e = FileSystemRegistry.listRoots();
??????? browser = new List(currDirName, List.IMPLICIT);
????? }
????? else
????? {
??????? currDir = (FileConnection)Connector.open(
????????? "file://localhost/ " + currDirName);
??????? e = currDir.list();
??????? browser = new List(currDirName, List.IMPLICIT);
??????? browser.append(UP_DIRECTORY,null);
????
????? }
????? while (e.hasMoreElements())
????? {
??????? String fileName = (String)e.nextElement();
??????? if (fileName.charAt(fileName.length()-1) == SEP)
??????? {
????????? browser.append(fileName,null);
??????? }
??????? else
??????? {
????????? browser.append(fileName,null);
??????? }
????? }
????? browser.setSelectCommand(view);
????? browser.addCommand(exit);
????? browser.setCommandListener(this);
????? if (currDir != null)
????? {
??????? currDir.close();
????? }
????? Display.getDisplay(this).setCurrent(browser);
??? }
??? catch (IOException ioe)
??? {}
}

void traverseDirectory(String fileName)
{
??? if (currDirName.equals(MEGA_ROOT))
??? {
????? if (fileName.equals(UP_DIRECTORY))
????? {
??????? // can not go up from MEGA_ROOT
??????? return;
????? }
????? currDirName = fileName;
??? }
??? else if (fileName.equals(UP_DIRECTORY))
??? {
????? // Go up one directory
????? // TODO use setFileConnection when implemented
????? int i = currDirName.lastIndexOf(SEP, currDirName.length()-2);
????? if (i != -1)
????? {
??????? currDirName = currDirName.substring(0, i+1);
????? }
????? else
????? {
??????? currDirName = MEGA_ROOT;
????? }
??? }
??? else
??? {
????? currDirName = currDirName + fileName;
??? }
??? showCurrDir();
}

void showFile(String fileName)
{try
??? {
????? FileConnection fc = (FileConnection)
????? Connector.open("file://localhost/ " + currDirName + fileName);
????? if (!fc.exists())
????? {
??????? throw new IOException("File does not exists");
????? }
????? InputStream fis = fc.openInputStream();
????? byte[] b = new byte[1024];
????? int length = fis.read(b, 0, 1024);
????? fis.close();
????? fc.close();

????? TextBox tb = new TextBox("View File: " + fileName, null, 1024,
????????? TextField.ANY | TextField.UNEDITABLE);

????? tb.addCommand(back);
????? tb.addCommand(exit);
????? tb.setCommandListener(this);

????? if (length > 0)
????? {
??????? tb.setString(new String(b, 0, length));
????? }
????? Display.getDisplay(this).setCurrent(tb);
??? }
??? catch (Exception e) {}
}
}