File logging

[joelg236]

I have written some code for logging (Driverstation and files), but without a CRIO I am not sure whether it works or not. I am still trying to grasp logging and input/output streams in java, as I have next to no experience with it. Would this code work? And what would work better?

package frc.team4334.debug;

import com.sun.squawk.microedition.io.FileConnection;
import edu.wpi.first.wpilibj.DriverStationLCD;
import java.io.DataOutputStream;
import java.io.IOException;
import javax.microedition.io.Connector;

/**
 * Logging class. Used to give messages to user in different ways depending on
 * urgency.
 *
 * @author Joel Gallant
 */
public class Log {

    /**
     * Class representing the urgency of the log.
     */
    public static class urgency {}

    /**
     * Urgency values.
     */
    public final static urgency URGENT = new urgency(),
            WARNING = new urgency(),
            USERMESSAGE = new urgency(),
            STATUSREPORT = new urgency(),
            LOG = new urgency();

    /**
     * Logs a message, and depending on the urgency given, reacts appropriately.
     *
     * @param urgency Urgency of the log. Urgencies are available as static
     * variables in the {@link Log Log} class.
     * @param msg Message to send to the user.
     */
    public static void log(urgency urgency, String msg) {
        String usrMsg = msg;
        if(urgency == URGENT) {
            usrMsg.toUpperCase();
            dsLCD("!!! URGENT !!! : "+usrMsg);
            dsLCD("IT IS ADVISED TO TURN THE ROBOT OFF");
            usrMsg = "!!! URGENT !!! : "+usrMsg+"\n"+"IT IS ADVISED TO TURN THE ROBOT OFF";
        }else if(urgency == WARNING) {
            usrMsg.toUpperCase();
            usrMsg = "WARNING : "+usrMsg;
            dsLCD(usrMsg);
        }else if(urgency == USERMESSAGE) {
            dsLCD(usrMsg);
        }else if(urgency == STATUSREPORT) {
            usrMsg = "STATUS : "+msg;
            dsLCD("STATUS : "+msg);
        }
            // All logs are logged
            resume();
            makeLog();
            write(usrMsg);
            pause();
    }

   /**
     * Writes the specified string (plus a newline) into the log file.
     *
     * @param output The string to be written.
     */
    private static synchronized void write(String output){
        String kOutput = output + "\n";
        try {
            if (kDos != null)
                kDos.write(kOutput.getBytes(), 0, kOutput.getBytes().length);
        } catch (IOException e){
            System.out.println("Unable to write to log.");
        }
    }

    private static final String PATH = "file:///log.txt";
    private static DataOutputStream kDos;
    private static FileConnection kConnection;

    private static void makeLog() {
        try {
            if (kDos != null) {
                kDos.close();
                kDos = null;
            }
            if (kConnection != null) {
                kConnection.close();
                kConnection = null;
            }

            kConnection = (FileConnection) Connector.open(PATH, Connector.READ_WRITE);
            if (kConnection.exists()) {
                kConnection.delete();
                kConnection.close();
                kConnection = (FileConnection)Connector.open(PATH, Connector.READ_WRITE);
            }

            kConnection.create();

            kDos = kConnection.openDataOutputStream();
        } catch (IOException e) {
            System.out.println("Unable to create file log.");
        }
    }

    /**
     * Closes the file temporarily for other file writing operations
     */
    private static synchronized void pause(){
        try {
            kConnection.close();
            kDos.close();
        } catch (IOException e){
            Log.write(e.getMessage());
        }
    }

    /**
     * Reopens the last file for resumed logging functionality
     */
    private static synchronized void resume(){
        try {
            kConnection.create();
            kDos = kConnection.openDataOutputStream();
        } catch (IOException e){
            Log.write(e.getMessage());
        }
    }

    private static int lineNum = 1;
    private static void dsLCD(String msg) {
        DriverStationLCD.Line line;
        switch(lineNum) {
            case(1):
                line = DriverStationLCD.Line.kMain6;
                break;
            case(2):
                line = DriverStationLCD.Line.kUser2;
                break;
            case(3):
                line = DriverStationLCD.Line.kUser3;
                break;
            case(4):
                line = DriverStationLCD.Line.kUser4;
                break;
            case(5):
                line = DriverStationLCD.Line.kUser5;
                break;
            case(6):
                line = DriverStationLCD.Line.kUser6;
                break;
            default:
                line = DriverStationLCD.Line.kMain6;
        }
        DriverStationLCD.getInstance().println(line, lineNum, msg+"                             ");
        DriverStationLCD.getInstance().updateLCD();
        lineNum++;
        if(lineNum > 6) {
            lineNum = 1;
        }
    }
}