sLog

/***********************************************************************
 * Module:  sLog.java
 * Author:  Goran Todorovic
 * Purpose: Defines the class for event logs (GEER logger class)
 ***********************************************************************/
package geer.app.config;

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Log class
 * @author Goran Todorovic
 *
 */
public class sLog {
    /**
     * Log file path
     */
    private static String logFile = "geer.log";

    /**
     * Date format
     */
    private final static DateFormat df = new SimpleDateFormat ("dd.MM.yyyy  hh:mm:ss");

    /**
     * Class constructor without params
     */
    private sLog() { }

    /**
     * Set log file
     * @param filename
     */
    public static void setLogFile(String filename) {
        logFile = filename;

        new File(filename).delete();

        try {
            write("Log file initiated : " + filename);
        }
        catch (Exception e) {
            System.out.println(stack2string(e));
        }

    }

    /**
     * Write string to log file
     * @param msg
     */
    public static void write(String msg) {
        write(logFile, msg);
    }

    /**
     * Write console output
     * @param msg
     */
    public static void writeConsole(String msg) {
        Date now = new Date();
        String currentTime = sLog.df.format(now);
        System.out.println("[" + currentTime + "] sLog: " + msg);
    }

    /**
     * Write exception to log file
     * @param e
     */
    public static void write(Exception e) {
        write(logFile, stack2string(e));
    }

    /**
     * Write string to file chosen by user
     * @param file - Input file
     * @param msg - string message
     */
    public static void write(String file, String msg) {
        try {
            Date now = new Date();
            String currentTime = sLog.df.format(now);
            FileWriter aWriter = new FileWriter(file, true);
            aWriter.write(currentTime + " " + msg + System.getProperty("line.separator"));
            System.out.println(currentTime + " " + msg);
            aWriter.flush();
            aWriter.close();
        }
        catch (Exception e) {
            System.out.println(stack2string(e));
        }
    }

    /**
     * Convert exception to string and write to file
     * @param e
     * @return
     */
    private static String stack2string(Exception e) {
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            e.printStackTrace(pw);
            return "------\r\n" + sw.toString() + "------\r\n";
        }
        catch(Exception e2) {
            return "Error: Bad stack2string!";
        }
    }
}