Fixed sonarqube findings
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//CipherStreamJava/src/main/java/com/mattrixwv/CipherStreamJava/polySubstitution/Bifid.java
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//Mattrixwv
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// Created: 03-03-22
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//Modified: 03-03-22
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package com.mattrixwv.cipherstream.polysubstitution;
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import com.mattrixwv.cipherstream.exceptions.InvalidCharacterException;
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import com.mattrixwv.cipherstream.exceptions.InvalidInputException;
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import com.mattrixwv.cipherstream.exceptions.InvalidKeywordException;
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public class Bifid{
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private String inputString; //The message that needs to be encoded/decoded
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private String outputString; //The encoded/decoded message
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private String keyword; //The keyword used to create the grid
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private PolybiusSquare polybiusSquare; //Used to encode the message to numbers then back into letters
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private boolean preserveCapitals; //Persist capitals in the output string
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private boolean preserveWhitespace; //Persist whitespace in the output string
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private boolean preserveSymbols; //Persist symbols in the output string
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//Strips invalid characters from the keyword and creates the grid
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private void setKeyword(String keyword) throws InvalidKeywordException{
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//Ensure the keyword isn't null
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if(keyword == null){
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throw new InvalidKeywordException("Keyword cannot be null");
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}
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//Save the key for polybius to deal with
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this.keyword = keyword;
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}
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//Ensures inputString constraints
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private void setInputString(String inputString) throws InvalidInputException{
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//Ensure the input string isn't null
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if(inputString == null){
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throw new InvalidInputException("Input cannot be null");
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}
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//Apply removal options
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if(!preserveCapitals){
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inputString = inputString.toUpperCase();
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}
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if(!preserveWhitespace){
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inputString = inputString.replaceAll("\\s", "");
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}
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if(!preserveSymbols){
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inputString = inputString.replaceAll("[^a-zA-Z\\s]", "");
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}
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//Save the string
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this.inputString = inputString;
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//Ensure the string isn't blank
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if(this.inputString.isBlank()){
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throw new InvalidInputException("Input must contain at least 1 letter");
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}
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}
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//Adds all non-letter characters back to the output string
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private void formatOutput(String outputString){
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//Keep track of where you are in the output
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int outputCnt = 0;
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StringBuilder output = new StringBuilder();
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//Check every character in the input and apply the correct rules to the output
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for(char ch : inputString.toCharArray()){
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if(Character.isUpperCase(ch)){
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output.append(Character.toUpperCase(outputString.charAt(outputCnt++)));
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}
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else if(Character.isLowerCase(ch)){
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output.append(Character.toLowerCase(outputString.charAt(outputCnt++)));
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}
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else{
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output.append(ch);
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}
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}
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//Save the output
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this.outputString = output.toString();
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}
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//Encodes inputString using a polybius square and stores the result in outputString
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private void encode() throws InvalidCharacterException, InvalidInputException{
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//Get the encoded numbers from a polybius square
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String numberResult = polybiusSquare.encode(keyword, inputString).replaceAll("\\s", "");
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keyword = polybiusSquare.getKeyword(); //Save the cleaned keyword
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//Split the numbers into 2 rows and rejoin the rows to create a new string
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StringBuilder row0 = new StringBuilder();
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StringBuilder row1 = new StringBuilder();
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boolean firstNum = true;
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for(char ch : numberResult.toCharArray()){
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if(firstNum){
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row0.append(ch);
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}
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else{
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row1.append(ch);
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}
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firstNum = !firstNum;
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}
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String shuffledResult = row0.toString() + row1.toString();
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//Take the new string and decode the numbers using polybius
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String letterResult = polybiusSquare.decode(keyword, shuffledResult);
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//Format the output
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formatOutput(letterResult);
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}
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//Decodes inputString using a polybius square and stores the result in outputString
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private void decode() throws InvalidCharacterException, InvalidInputException{
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//Get the decoded number from a polybius square
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String numberResult = polybiusSquare.encode(keyword, inputString).replaceAll("\\s", "");
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keyword = polybiusSquare.getKeyword();
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//Split the numbers into to rows and rejoin the rows to create a new string
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String row0 = numberResult.substring(0, numberResult.length() / 2);
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String row1 = numberResult.substring(numberResult.length() / 2);
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StringBuilder unshuffledResult = new StringBuilder();
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for(int cnt = 0;cnt < row0.length();++cnt){
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unshuffledResult.append(row0.charAt(cnt));
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unshuffledResult.append(row1.charAt(cnt));
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}
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//Take the new string and decode the numbers using polybius
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String letterResult = polybiusSquare.decode(keyword, unshuffledResult.toString());
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//Format the outputString
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formatOutput(letterResult);
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}
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//Constructor
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public Bifid() throws InvalidCharacterException{
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preserveCapitals = false;
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preserveWhitespace = false;
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preserveSymbols = false;
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polybiusSquare = new PolybiusSquare(false, false);
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reset();
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}
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public Bifid(boolean preserveCapitals, boolean preserveWhitespace, boolean preserveSymbols) throws InvalidCharacterException{
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this.preserveCapitals = preserveCapitals;
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this.preserveWhitespace = preserveWhitespace;
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this.preserveSymbols = preserveSymbols;
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polybiusSquare = new PolybiusSquare(false, false);
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reset();
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}
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//Encodes inputString using keyword and returns the result
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public String encode(String keyword, String inputString) throws InvalidKeywordException, InvalidInputException, InvalidCharacterException{
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//Set the parameters
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reset();
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setKeyword(keyword);
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setInputString(inputString);
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//Encode and return the message
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encode();
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return outputString;
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}
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//Decodes inputString using keyword and returns the result
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public String decode(String keyword, String inputString) throws InvalidKeywordException, InvalidInputException, InvalidCharacterException{
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//Set the parameters
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reset();
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setKeyword(keyword);
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setInputString(inputString);
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//Decode and return the message
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decode();
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return outputString;
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}
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//Makes sure all variables are empty
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public void reset(){
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inputString = "";
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outputString = "";
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keyword = "";
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}
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//Gets
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public String getInputString(){
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return inputString;
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}
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public String getOutputString(){
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return outputString;
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}
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public String getKeyword(){
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return keyword;
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}
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}
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