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komalvenugopalkomalvenugopal
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Added handler and Main.java
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9 files changed

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‎.gitignore

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/target/
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*.class
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.settings
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.project

‎src/main/java/com/cmpe202/individualproject/handlers/Amex.java

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package com.cmpe202.individualproject.handlers;
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import com.cmpe202.individualproject.main.CreditCardEntry;
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public class Amex implements CreditCardHandler {
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CreditCardHandler nextHandler;
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/**
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* Default constructor for the Amex class.
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* It sets the next handler in the chain to Discover.
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*/
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public Amex() {
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nextHandler = new Discover();
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}
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/**
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* Checks the credit card type for an American Express card.
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* If the card number matches the pattern, it returns "AmericanExpress".
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* Otherwise, it delegates the request to the next handler in the chain.
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*
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* @param creditCardEntry The credit card entry to check.
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* @return The credit card type, or delegates to the next handler.
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*/
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@Override
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public String checkCreditCardType(CreditCardEntry creditCardEntry) {
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String number = creditCardEntry.getCardNumber();
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String result = "";
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String fDigit = number.substring(0, 1);
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int sDigit = Integer.parseInt(number.substring(1, 2));
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System.out.println(number + " ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Amex");
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if (fDigit.equals("3") && number.length() == 15 && (sDigit == 4 || sDigit == 7)) {
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result = "AmericanExpress";
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} else {
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return nextHandler.checkCreditCardType(creditCardEntry);
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}
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return result;
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}
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}

‎src/main/java/com/cmpe202/individualproject/handlers/CreditCardHandler.java

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package com.cmpe202.individualproject.handlers;
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import com.cmpe202.individualproject.main.CreditCardEntry;
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/**
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* The CreditCardHandler interface defines the contract for classes that handle credit card type identification.
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*/
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public interface CreditCardHandler {
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/**
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* Checks the credit card type for the given CreditCardEntry.
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*
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* @param creditCardEntry The credit card entry to check.
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* @return The credit card type as a string.
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*/
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String checkCreditCardType(CreditCardEntry creditCardEntry);
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}
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‎src/main/java/com/cmpe202/individualproject/handlers/Discover.java

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package com.cmpe202.individualproject.handlers;
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import com.cmpe202.individualproject.main.CreditCardEntry;
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public class Discover implements CreditCardHandler {
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CreditCardHandler nextHandler;
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public Discover() {
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}
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@Override
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public String checkCreditCardType(CreditCardEntry creditCardEntry) {
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// Get the credit card number from the CreditCardEntry
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String a = creditCardEntry.getCardNumber();
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String number = a.toString();
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String result = "";
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// Extract the first four digits from the credit card number
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String fourDigit = number.substring(0, 4);
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int sDigit = Integer.parseInt(number.substring(1, 2));
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System.out.println(a + " ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Discover");
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// Check various conditions to determine the credit card type
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if (a.length() > 16) {
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result = "Invalid: more than 19 digits";
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} else if (!a.matches("[0-9]+")) {
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result = "Invalid: non numeric characters";
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} else if (a.equals("") || a.length() == 0) {
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result = "Invalid: empty/null card number";
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} else if (fourDigit.equals("6011") && number.length() == 16) {
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result = "Discover";
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} else {
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result = "Invalid: Not a possible card number";
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}
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return result;
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}
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}

‎src/main/java/com/cmpe202/individualproject/handlers/MasterCard.java

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package com.cmpe202.individualproject.handlers;
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import com.cmpe202.individualproject.main.CreditCardEntry;
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public class MasterCard implements CreditCardHandler {
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CreditCardHandler nextHandler;
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public MasterCard() {
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nextHandler = new Visa();
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}
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@Override
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public String checkCreditCardType(CreditCardEntry creditCardEntry) {
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// Get the credit card number from the CreditCardEntry
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String a = creditCardEntry.getCardNumber();
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String number = a.toString();
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String result = "";
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System.out.println(a + " ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ MC" + number + " " + a.length());
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// Check various conditions to determine the credit card type
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if (a.equalsIgnoreCase("null")) {
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return "Invalid: No Card Number";
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} else if (a.length() > 19) {
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return "Invalid: more than 19 digits";
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} else if (a.length() == 0) {
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return "Invalid: empty/null card number";
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} else if (!a.matches("[0-9]+")) {
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return "Invalid: non-numeric characters";
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} else if (number.length() <= 19 && number.length() > 0) {
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String fDigit = number.substring(0, 1);
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int sDigit = Integer.parseInt(number.substring(1, 2));
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// Check if the credit card number starts with '5', the second digit is between 1 and 5,
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// and the length is 16 to determine it as a MasterCard
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if (fDigit.equals("5") && sDigit >= 1 && sDigit <= 5 && number.length() == 16) {
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result = "MasterCard";
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} else {
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// If the conditions are not met, delegate to the next credit card handler
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return nextHandler.checkCreditCardType(creditCardEntry);
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}
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} else {
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System.out.println("Invalid card type!");
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}
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return result;
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}
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}

‎src/main/java/com/cmpe202/individualproject/handlers/Visa.java

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package com.cmpe202.individualproject.handlers;
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import com.cmpe202.individualproject.main.CreditCardEntry;
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public class Visa implements CreditCardHandler {
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CreditCardHandler nextHandler;
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public Visa() {
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nextHandler = new Amex();
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}
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@Override
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public String checkCreditCardType(CreditCardEntry creditCardEntry) {
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// Get the credit card number from the CreditCardEntry
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String a = creditCardEntry.getCardNumber();
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String number = a.toString();
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String result = "";
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String fDigit = number.substring(0, 1);
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System.out.println(a + " ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Visa");
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// Check various conditions to determine the credit card type
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if (a.length() > 19) {
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return "Invalid: more than 19 digits";
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} else if (a.length() == 0) {
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return "Invalid: empty/null card number";
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} else if (fDigit.equals("4") && (number.length() == 13 || number.length() == 16)) {
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// Check if the credit card number starts with '4' and has a length of either 13 or 16
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// to determine it as a Visa card
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result = "Visa";
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} else {
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// If the conditions are not met, delegate to the next credit card handler
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return nextHandler.checkCreditCardType(creditCardEntry);
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}
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return result;
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}
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}

‎src/main/java/com/cmpe202/individualproject/main/App.java

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package com.cmpe202.individualproject.main;
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import com.cmpe202.individualproject.handlers.CreditCardHandler;
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import com.cmpe202.individualproject.handlers.MasterCard;
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import com.cmpe202.individualproject.reader.CSVReader;
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import com.cmpe202.individualproject.reader.JSONReader;
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import com.cmpe202.individualproject.reader.Reader;
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import com.cmpe202.individualproject.reader.XMLReader;
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import com.cmpe202.individualproject.writer.CSVWriter;
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import com.cmpe202.individualproject.writer.JSONWriter;
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import com.cmpe202.individualproject.writer.Writer;
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import com.cmpe202.individualproject.writer.XMLWriter;
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import java.io.File;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Scanner;
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public class App {
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public static String getFileType(String inputFile) {
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int lastDotIndex = inputFile.lastIndexOf('.'); // Find the index of the last dot in the file name
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if (lastDotIndex > 0 && lastDotIndex < inputFile.length() - 1) { // Ensure the dot is not the first or last character
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return inputFile.substring(lastDotIndex + 1); // Extract the file extension after the dot
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}
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return ""; // Return an empty string if no valid file extension is found
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}
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public static void main(String[] args) {
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String outputFile, inputFile;
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String inputFileType = "";
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String outputFileType = "";
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Reader fileReader;
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Writer fileWriter = null;
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List<CreditCardEntry> creditCardEntries = new ArrayList<>();
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List<OutputEntry> finalEntries = new ArrayList<>();
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Scanner scanner = new Scanner(System.in);
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// Get input file path from the user
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System.out.print("Enter the input file path: ");
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inputFile = scanner.nextLine();
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// Get output file path from the user
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System.out.print("Enter the output file path: ");
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outputFile = scanner.nextLine();
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// Extract the input and output file extensions
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inputFileType = inputFile.substring(inputFile.indexOf("."));
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outputFileType = outputFile.substring(outputFile.indexOf("."));
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if (!inputFileType.equals(outputFileType)) {
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System.out.println("Input and Output extensions are not the same");
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System.exit(0);
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} else {
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System.out.println("Input and output extensions " + inputFileType + " and " + outputFileType + " are the same");
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}
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// Get the file type (extension) of the input file
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String fileType = getFileType(inputFile);
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System.out.println("File type: " + fileType);
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// Initialize the appropriate reader and writer based on the file type
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switch (fileType.toLowerCase()) {
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case "csv":
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fileReader = new CSVReader(new File(inputFile));
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fileWriter = new CSVWriter();
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break;
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case "json":
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fileReader = new JSONReader(new File(inputFile));
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fileWriter = new JSONWriter();
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break;
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case "xml":
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System.out.println("Processing XML file");
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fileReader = new XMLReader(new File(inputFile));
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fileWriter = new XMLWriter();
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break;
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default:
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System.out.println("Unsupported file type: " + fileType);
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return;
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}
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// Read the credit card entries from the input file
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creditCardEntries = fileReader.readFile(inputFile);
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// Process each credit card entry and write the results to the output file
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for (CreditCardEntry eachCreditCardEntry : creditCardEntries) {
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CreditCardHandler ccHandler = new MasterCard();
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String creditCardType = ccHandler.checkCreditCardType(eachCreditCardEntry);
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String ccNumber = eachCreditCardEntry.getCardNumber();
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finalEntries.add(new OutputEntry(ccNumber, creditCardType));
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}
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fileWriter.writeToFile(finalEntries, outputFile);
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}
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}

‎src/main/java/com/cmpe202/individualproject/main/CreditCardEntry.java

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package com.cmpe202.individualproject.main;
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import java.util.Date;
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public class CreditCardEntry {
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private String cardNumber; // Card number
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private Date expirationDate; // Expiration date of the card
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private String nameOfCardholder; // Name of the cardholder
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// Constructor with card number, expiration date, and cardholder name
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public CreditCardEntry(String cardNumber, Date expirationDate, String nameOfCardholder) {
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this.cardNumber = cardNumber;
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this.expirationDate = expirationDate;
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this.nameOfCardholder = nameOfCardholder;
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}
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// Constructor with card number and cardholder name
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public CreditCardEntry(String cardNumber, String nameOfCardholder) {
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this.cardNumber = cardNumber;
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this.nameOfCardholder = nameOfCardholder;
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}
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// Getter for card number
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public String getCardNumber() {
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return cardNumber;
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}
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// Setter for card number
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public void setCardNumber(String cardNumber) {
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this.cardNumber = cardNumber;
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}
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// Getter for expiration date
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public Date getExpirationDate() {
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return expirationDate;
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}
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// Setter for expiration date
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public void setExpirationDate(Date expirationDate) {
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this.expirationDate = expirationDate;
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}
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// Getter for cardholder name
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public String getNameOfCardholder() {
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return nameOfCardholder;
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}
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// Setter for cardholder name
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public void setNameOfCardholder(String nameOfCardholder) {
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this.nameOfCardholder = nameOfCardholder;
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}
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}

‎src/main/java/com/cmpe202/individualproject/main/OutputEntry.java

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package com.cmpe202.individualproject.main;
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public class OutputEntry {
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String cardNumber;
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String type;
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/**
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* Default constructor for OutputEntry class.
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*/
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public OutputEntry() {
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}
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/**
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* Constructor for creating an OutputEntry object with card number and type.
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*
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* @param cardNumber The card number.
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* @param type The type of the card.
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*/
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public OutputEntry(String cardNumber, String type) {
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this.cardNumber = cardNumber;
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this.type = type;
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}
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/**
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* Retrieves the card number.
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*
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* @return The card number.
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*/
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public String getCardNumber() {
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return cardNumber;
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}
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/**
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* Sets the card number.
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*
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* @param cardNumber The card number to set.
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*/
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public void setCardNumber(String cardNumber) {
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this.cardNumber = cardNumber;
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}
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/**
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* Retrieves the card type.
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*
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* @return The card type.
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*/
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public String getType() {
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return type;
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}
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/**
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* Sets the card type.
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*
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* @param type The card type to set.
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*/
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public void setType(String type) {
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this.type = type;
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}
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}

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