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/*

Francis Hinson, Binley Yang, Hiroyuki Asaga

Lab20.java, Lab20JFile.java, Lab20JFileTest.java, tester.txt

*/

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.ObjectOutputStream;

import java.io.PrintWriter;

import java.util.NoSuchElementException;

import java.util.Random;

import java.util.Scanner;

public class Lab20 {

private Scanner file;

public static void main(String[] args){

Scanner input = new Scanner(System.in);

System.out.println("Enter file or directory name. (Use C:/Users/Francis/Desktop/tester.txt)"); //////////////////// Part 1

String f = input.nextLine();

Lab20 application = new Lab20();

System.out.println("This is what the file looks like initially:");

application.read(f); //////////////////////////////////////////////////////////////////////// Part 3

System.out.println("This is what the file looks like after the numbers are squared:");

application.square(f); ////////////////////////////////////////////////////////////////////// Part 4

application.read(f);

System.out.println("This is what the file looks like after you add the tokens:");

application.add(f); ///////////////////////////////////////////////////////////////////////// Part 2

application.read(f);

application.close();

}

public int squaring(int x){

x = x*x;

return x;

}

public static boolean check(String path){

File name = new File(path);

if(name.exists()){

return true;

}

else{

return false;

}

}

public void read(String f){

try{

try {

file = new Scanner(new File(f));

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

while(file.hasNext()){

System.out.println(file.next());

}

}

catch(NoSuchElementException elementException){

System.err.println("No Such Element Error");

System.exit(1);

}

catch (IllegalStateException stateException){

System.err.println("Illegal State Error");

System.exit(1);

}

}

public void square(String file) {

try {

File newFile = new File(file);

File temporaryFile = new File(newFile.getAbsolutePath() + ".tmp");

BufferedReader br = new BufferedReader(new FileReader(file));

PrintWriter pw = new PrintWriter(new FileWriter(temporaryFile));

String line = null;

while ((line = br.readLine()) != null) {

pw.println((int)Math.pow(Integer.parseInt(line),2));

pw.flush();

}

pw.close();

br.close();

if (!newFile.delete()) {

System.out.println("Error deleting file");

return;

}

if (!temporaryFile.renameTo(newFile))

System.out.println("Error renaming file");

}

catch (NumberFormatException e) {

//The line is not a number

}

catch (FileNotFoundException e) {

e.printStackTrace();

}

catch (IOException e) {

e.printStackTrace();

}

}

public void add(String f){

BufferedWriter bw = null;

Random random = new Random();

try {

bw = new BufferedWriter(new FileWriter(f, true));

bw.newLine();

for (int i = 0; i <= random.nextInt(10)+10; i++){

bw.write(ranSring(random, "alskdfjas", 3) + random.nextInt(10));

bw.newLine();

bw.flush();

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public void close(){

if (file!= null){

file.close();

}

}

public static String ranSring(Random range, String chars, int length) //http://stackoverflow.com/questions/2863852/how-to-generate-a-random-string-in-java

{

char[] text = new char[length];

for (int i = 0; i < length; i++)

{

text[i] = chars.charAt(range.nextInt(chars.length()));

}

return new String(text);

}

}