Notice that the current design only allows for a fixed number of predetermined j

Question

Notice that the current design only allows for a fixed number of predetermined jokes to be told, and also makes use of some poor programming style for defining the cases of the protocol. Define a text format (JSON, XML, or some other format), to allow for the program to make use of an input file containing a pool of jokes to tell. Clean up the Protocol class, and make the necessary modifications so that the jokes are selected at random from the provided with no joke being told more than once.

Client Code-

package edu.gregory.gelfond.clients;

import java.io.*;
import java.net.*;

public class KnockKnockClient {
public static void main(String[] args) throws IOException {

if (args.length != 2) {
System.err.println(
"Usage: java EchoClient <host name> <port number>");
System.exit(1);
}

String hostName = args[0];
int portNumber = Integer.parseInt(args[1]);

try (
Socket kkSocket = new Socket(hostName, portNumber);
PrintWriter out = new PrintWriter(kkSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(kkSocket.getInputStream()));
) {
BufferedReader stdIn =
new BufferedReader(new InputStreamReader(System.in));
String fromServer;
String fromUser;

while ((fromServer = in.readLine()) != null) {
System.out.println("Server: " + fromServer);
if (fromServer.equals("Bye."))
break;

fromUser = stdIn.readLine();
if (fromUser != null) {
System.out.println("Client: " + fromUser);
out.println(fromUser);
}
}
} catch (UnknownHostException e) {
System.err.println("Don't know about host " + hostName);
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to " +
hostName);
System.exit(1);
}
}
}

Server-Code

package edu.gregory.gelfond.servers;

import edu.gregory.gelfond.protocols.KnockKnockProtocol;

import java.net.*;
import java.io.*;

public class KnockKnockServer {
public static void main(String[] args) throws IOException {

if (args.length != 1) {
System.err.println("Usage: java KnockKnockServer <port number>");
System.exit(1);
}

int portNumber = Integer.parseInt(args[0]);

try (
ServerSocket serverSocket = new ServerSocket(portNumber);
Socket clientSocket = serverSocket.accept();
PrintWriter out =
new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(clientSocket.getInputStream()));
) {

String inputLine, outputLine;

// Initiate conversation with client
KnockKnockProtocol kkp = new KnockKnockProtocol();
outputLine = kkp.processInput(null);
out.println(outputLine);

while ((inputLine = in.readLine()) != null) {
outputLine = kkp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye."))
break;
}
} catch (IOException e) {
System.out.println("Exception caught when trying to listen on port "
+ portNumber + " or listening for a connection");
System.out.println(e.getMessage());
}
}
}

Protocol Code

package edu.gregory.gelfond.protocols;

public class KnockKnockProtocol {
private static final int WAITING = 0;
private static final int SENTKNOCKKNOCK = 1;
private static final int SENTCLUE = 2;
private static final int ANOTHER = 3;

private static final int NUMJOKES = 5;

private int state = WAITING;
private int currentJoke = 0;

private String[] clues = {"Turnip", "Little Old Lady", "Atch", "Who", "Who"};
private String[] answers = {"Turnip the heat, it's cold in here!",
"I didn't know you could yodel!",
"Bless you!",
"Is there an owl in here?",
"Is there an echo in here?"};

public String processInput(String theInput) {
String theOutput = null;

if (state == WAITING) {
theOutput = "Knock! Knock!";
state = SENTKNOCKKNOCK;
} else if (state == SENTKNOCKKNOCK) {
if (theInput.equalsIgnoreCase("Who's there?")) {
theOutput = clues[currentJoke];
state = SENTCLUE;
} else {
theOutput = "You're supposed to say "Who's there?"! " +
"Try again. Knock! Knock!";
}
} else if (state == SENTCLUE) {
if (theInput.equalsIgnoreCase(clues[currentJoke] + " who?")) {
theOutput = answers[currentJoke] + " Want another? (y/n)";
state = ANOTHER;
} else {
theOutput = "You're supposed to say "" +
clues[currentJoke] +
" who?"" +
"! Try again. Knock! Knock!";
state = SENTKNOCKKNOCK;
}
} else if (state == ANOTHER) {
if (theInput.equalsIgnoreCase("y")) {
theOutput = "Knock! Knock!";
if (currentJoke == (NUMJOKES - 1))
currentJoke = 0;
else
currentJoke++;
state = SENTKNOCKKNOCK;
} else {
theOutput = "Bye.";
state = WAITING;
}
}
return theOutput;
}
}

Explanation / Answer

Client code class and server code class i didnt changed. I have changed protocol class and accepts input files as json format mentioned below. I have added random pick up of data from json. Please add json-simple-1.1.jar file for json libarries to run the code. Please execute the code and let me know any issues.

Path for json file: C:\test.json

Client-code

package com.cheggg;
import java.io.*;
import java.net.*;
public class KnockKnockClient {
public static void main(String[] args) throws IOException {
if (args.length != 2) {
System.err.println(
"Usage: java EchoClient <host name> <port number>");
System.exit(1);
}
String hostName = args[0];
int portNumber = Integer.parseInt(args[1]);
try (
Socket kkSocket = new Socket(hostName, portNumber);
PrintWriter out = new PrintWriter(kkSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(kkSocket.getInputStream()));
) {
BufferedReader stdIn =
new BufferedReader(new InputStreamReader(System.in));
String fromServer;
String fromUser;
while ((fromServer = in.readLine()) != null) {
System.out.println("Server: " + fromServer);
if (fromServer.equals("Bye."))
break;
fromUser = stdIn.readLine();
if (fromUser != null) {
System.out.println("Client: " + fromUser);
out.println(fromUser);
}
}
} catch (UnknownHostException e) {
System.err.println("Don't know about host " + hostName);
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to " +
hostName);
System.exit(1);
}
}
}

Server-code

package com.cheggg;

import java.net.*;

import org.json.simple.parser.ParseException;

import java.io.*;

public class KnockKnockServer {
public static void main(String[] args) throws IOException, ParseException {
if (args.length != 1) {
System.err.println("Usage: java KnockKnockServer <port number>");
System.exit(1);
}
int portNumber = Integer.parseInt(args[0]);
try (
ServerSocket serverSocket = new ServerSocket(portNumber);
Socket clientSocket = serverSocket.accept();
PrintWriter out =
new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(clientSocket.getInputStream()));
) {
String inputLine, outputLine;
// Initiate conversation with client
KnockKnockProtocol kkp = new KnockKnockProtocol();
outputLine = kkp.processInput(null);
out.println(outputLine);
while ((inputLine = in.readLine()) != null) {
outputLine = kkp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye."))
break;
}
} catch (IOException e) {
System.out.println("Exception caught when trying to listen on port "
+ portNumber + " or listening for a connection");
System.out.println(e.getMessage());
}
}
}

protocol code

package com.cheggg;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.util.HashSet;

import java.util.Random;

import java.util.Set;

import org.json.simple.JSONArray;

import org.json.simple.JSONObject;

import org.json.simple.parser.JSONParser;

import org.json.simple.parser.ParseException;

public class KnockKnockProtocol {

private static final int WAITING = 0;

private static final int SENTKNOCKKNOCK = 1;

private static final int SENTCLUE = 2;

private static final int ANOTHER = 3;

private static final int NUMJOKES = 5;

private int state = WAITING;

private int currentJoke = 0;

private String[] clues ;

private String[] answers ;

Random random = new Random();

Set<Integer> validate = new HashSet<>();

int index = 0;

  

KnockKnockProtocol() throws FileNotFoundException, IOException, ParseException{

//constructor to load json data

JSONParser parser = new JSONParser();

JSONArray a = (JSONArray) parser.parse(new FileReader("c:\test.json"));

System.out.println(a.size());

clues=new String[a.size()];

answers=new String[a.size()];

for (Object o : a)

{

JSONObject person = (JSONObject) o;

String cluejson = (String) person.get("clue");

clues[a.lastIndexOf(o)]=cluejson;

String answerjson = (String) person.get("answer");

answers[a.lastIndexOf(o)]=answerjson;

}

index=random.nextInt(clues.length);

currentJoke = index;

validate.add(index);

}

public String processInput(String theInput) {

String theOutput = null;

  

/* Add First Randomly Genrated Number To Set */

// validate.add(random.nextInt(clues.length));

  

  

if (state == WAITING) {

theOutput = "Knock! Knock!";

state = SENTKNOCKKNOCK;

} else if (state == SENTKNOCKKNOCK) {

if (theInput.equalsIgnoreCase("Who's there?")) {

theOutput = clues[currentJoke];

state = SENTCLUE;

} else {

theOutput = "You're supposed to say "Who's there?"! " +

"Try again. Knock! Knock!";

}

} else if (state == SENTCLUE) {

if (theInput.equalsIgnoreCase(clues[currentJoke] + " who?")) {

theOutput = answers[currentJoke] + " Want another? (y/n)";

state = ANOTHER;

} else {

theOutput = "You're supposed to say "" +

clues[currentJoke] +

" who?"" +

"! Try again. Knock! Knock!";

state = SENTKNOCKKNOCK;

}

} else if (state == ANOTHER) {

if (theInput.equalsIgnoreCase("y")) {

theOutput = "Knock! Knock!";

if (currentJoke == (clues.length - 1)){

currentJoke = index;

}

  

else{

//System.out.println("index:::"+index);

while(validate.contains(index)) {

index = random.nextInt(clues.length);

//System.out.println("generated index:::"+index);

}

//index = random.nextInt(clues.length);

validate.add(index);

currentJoke=index;

}

  

state = SENTKNOCKKNOCK;

} else {

theOutput = "Bye.";

state = WAITING;

}

}

return theOutput;

}

}

test.json

[{

"clue":"Turnip",

"answer":"Turnip the heat, it's cold in here!"

},

{

"clue":"Little Old Lady",

"answer":"I didn't know you could yodel!"

},

{

"clue":"Atch",

"answer":"Bless you!"

},

{

"clue":"Who",

"answer":"Is there an owl in here?"

},

{

"clue":"Who",

"answer":"Is there an echo in here?"

}]

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