package util;

import java.io.*;
import java.util.*;
import java.text.*;

public class LogWriter{

  static private LogWriter instance;
  private Date d = new Date();
  DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.LONG,Locale.JAPAN);
  DateFormat timeFormat = DateFormat.getTimeInstance(DateFormat.LONG,Locale.JAPAN);

  private FileOutputStream fileOut;
  private FileInputStream fileIn;
  private PrintWriter pw;

  private final String FILE_PATH = "ExceptionLog.log";

  static synchronized public LogWriter getInstance(){
    if(instance == null){
      instance = new LogWriter();
    }
    return instance;
  }

  public LogWriter(){
    checkFile();
  }

  public void checkFile(){
    File f = new File(FILE_PATH);
    if(!f.exists()){
      try{
        f.createNewFile();
      }catch(Exception e){
        System.out.print(dateFormat.format(d)+timeFormat.format(d)+"checkFile():"+e.getMessage());
      }
    }
    createLog();
  }

  public void createLog(){
    try{
        fileIn = new FileInputStream(FILE_PATH);
        BufferedReader br = new BufferedReader(new InputStreamReader(fileIn));
        ArrayList sb = new ArrayList();
        int i = 0;
        while(br.read()!=-1){
          sb.add(i,br.readLine());
          //System.out.println(br.readLine());
          i++;
        }
        br.close();
        fileIn.close();
        fileOut = new FileOutputStream(FILE_PATH);
        pw = new PrintWriter(fileOut,false);
        //StringTokenizer st = new StringTokenizer(new String(sb),"rn");
        for(i=0;i