109 lines
3.6 KiB
Java
109 lines
3.6 KiB
Java
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/**
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* Class containing the methods for conversion
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* @author Isaac Shoebottom (3429069)
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*/
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public class Converter {
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/**
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* Convert hexadecimal to base 10
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* @param hex String containing the hex digits
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* @return returns the decimal value
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*/
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static long hex2Decimal(String hex) {
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String hexChars = "0123456789ABCDEF";
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hex = hex.toUpperCase();
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long decimal = 0;
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int intermediaryValue;
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char index;
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for (int i = hex.length(), p = 0; i != 0; i--, p++) {
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index = hex.charAt(i-1);
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intermediaryValue = hexChars.indexOf(index);
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if (intermediaryValue == -1)
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return -1;
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decimal = decimal + intermediaryValue*(int)(Math.pow(16, p));
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}
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return decimal;
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}
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/**
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* Converts the english text to the encoded text
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* @param english String containing standard english
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* @return Returns encoded text
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*/
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static String english2Encrypted(String english) {
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english = english.toUpperCase();
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if (english.length() > 1) {
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english = swapFirstAndLastLettersInString(english);
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}
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for (int i = 0; i < english.length(); i++) {
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char index = english.charAt(i);
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switch (index) {
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case 'E':
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english = replaceInString(english, i, "A");
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break;
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case 'A':
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english = replaceInString(english, i, "E");
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break;
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case 'O':
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english = replaceInString(english, i, "I");
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break;
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case 'I':
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english = replaceInString(english, i, "O");
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break;
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case 'U':
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english = replaceInString(english, i, "Y");
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break;
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case 'Y':
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english = replaceInString(english, i, "U");
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break;
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}
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}
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return english;
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}
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/**
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* Replace a letter in a string
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* @param str String to be modified
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* @param index The character's index to be replaced
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* @param replace The string that will be replacing the character
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* @return The string with the string replaced
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*/
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private static String replaceInString(String str, int index, String replace){
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return str.substring(0, index) + replace + str.substring(index+1);
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}
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/**
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* Swaps the first and letters in every word in a string
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* @param str The string to be swapped
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* @return The string with letters swapped
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*/
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private static String swapFirstAndLastLettersInString(String str) {
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StringBuilder output = new StringBuilder();
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String[] splitStr = str.trim().split("\\s+");
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for(int i = 0; i < splitStr.length; i++) {
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if (splitStr[i].length() != 1) {
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splitStr[i] = swapFirstAndLastLetterFromWord(splitStr[i]);
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}
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output.append(" ").append(splitStr[i]);
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if (i == 0) {
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output = new StringBuilder(splitStr[i]);
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}
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}
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return output.toString();
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}
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/**
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* Method to swap the first and last letters in a word
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* @param str The string to be swapped
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* @return The swapped string
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*/
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private static String swapFirstAndLastLetterFromWord(String str) {
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return str.charAt(str.length() - 1) + str.substring(1, str.length() - 1) + str.charAt(0);
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}
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}
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