After reading the background, please work on the following problem: a. The source process reads information from a file (Therefore, you need to prepare a small text file for testing purpose). b. The source process calls fork() to create the filter process. c. The filter process reads information from the source process (passed via an anonymous pipe), converts the uppercase characters to lowercase ones and vice versa, and then prints out the converted characters to the screen.

Explanation:

The following code is written in Java. It has the main method (source process) and a function called fork() which contains the filter process as described in the question. fork() takes in the file information as a parameter and prints out the information to the screen. The test can be seen with the output in the attached image below.

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

class {

   public static void main(String[] args) {

       String data = "";

       try {

           File myObj = new File("C:\\Users\\Gabriel2\\AppData\\Roaming\\JetBrains\\IdeaIC2020.2\\scratches\\input.txt"); //USE YOUR FILE LOCATION

           Scanner myReader = new Scanner(myObj);

           while (myReader.hasNextLine()) {

               data += myReader.nextLine();

               data += "\n";

           }

           myReader.close();

       } catch (FileNotFoundException e) {

           System.out.println("An error occurred.");

           e.printStackTrace();

       }

       System.out.println("Original: \n" + data);

       fork(data);

   }

   public static void fork(String data) {

       String output = "";

       for (int i = 0; i < data.length(); i++) {

           if (Character.isUpperCase(data.charAt(i)) == true) {

               output += Character.toLowerCase(data.charAt(i));

           } else if (Character.isLowerCase(data.charAt(i)) == true) {

               output += Character.toUpperCase(data.charAt(i));

           } else {

               output += data.charAt(i);

           }

       }

       System.out.println("Modified: \n" + output );

   }

}

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