Caesar cipher is implemented

2021-07-25 15:57:53 -04:00
parent aaa2031274
commit 4f8b440c59
4 changed files with 293 additions and 47 deletions
--- a/src/main/java/mattrixwv/CipherStreamJava/Caesar.java
+++ b/src/main/java/mattrixwv/CipherStreamJava/Caesar.java
@@ -0,0 +1,121 @@
+//CipherStreamJava/src/main/java/mattrixwv/CipherStreamJava/Caesar.java
+//Matthew Ellison
+// Created: 07-25-21
+//Modified: 07-25-21
+//This is the declaration of the Caesar class
+package mattrixwv.CipherStreamJava;
+
+
+public class Caesar{
+	private String inputString;		//The string that needs encoded/decoded
+	private String outputString;	//The encoded/decoded string
+	public static final String version = "1.0";	//The current version number for the library
+	private int shift;	//The amount that you need to shift each letter
+	//Sets shift and makes sure it is within the propper bounds
+	private void setShift(int shiftAmount){
+		//If you shift more than 26 you will just be wrapping back around again
+		shift = shiftAmount % 26;
+	}
+	//Sets the input string
+	private void setInputString(String inputString){
+		this.inputString = inputString;
+	}
+	//Encodes the inputString and stores the result in outputString
+	private String encode(){
+		for(int cnt = 0;cnt < inputString.length();++cnt){
+			char temp = inputString.charAt(cnt);	//A temperary holder for the current working character
+			//If it is an upper case letter shift it and wrap if necessary
+			if(Character.isUpperCase(temp)){
+				temp += shift;
+				//Wrap around if the letter is now out of bounds
+				if(temp < 'A'){
+					temp += 26;
+				}
+				else if(temp > 'Z'){
+					temp -= 26;
+				}
+			}
+			//If it is a lower case letter shift it and wrap if necessary
+			else if(Character.isLowerCase(temp)){
+				temp += shift;
+				//Wrap around if the letter is now out of bounds
+				if(temp < 'a'){
+					temp += 26;
+				}
+				else if(temp > 'z'){
+					temp -= 26;
+				}
+			}
+			//If it is whitespace, number, or punctuation just let it pass through
+			//Add it to the output string
+			outputString += temp;
+		}
+		return outputString;
+	}
+	//Decodes the inputString and stores the result in outputString
+	private String decode(){
+		for(int cnt = 0;cnt < inputString.length();++cnt){
+			char temp = inputString.charAt(cnt);	//A temperary holder for the current working character
+			//If it is an upper case letter shift it and wrap if necessary
+			if(Character.isUpperCase(temp)){
+				temp -= shift;
+				if(temp < 'A'){
+					temp += 26;
+				}
+				else if(temp > 'Z'){
+					temp -= 26;
+				}
+			}
+			//If it is a lower case letter shift it and wrap if necessary
+			else if(Character.isLowerCase(temp)){
+				temp -= shift;
+				if(temp < 'a'){
+					temp += 26;
+				}
+				else if(temp > 'z'){
+					temp -= 26;
+				}
+			}
+			//If it is whitespace, number, or punctuation just let it pass through
+			//Add it to the output string
+			outputString += temp;
+		}
+		return outputString;
+	}
+
+	//Constructor
+	public Caesar(){
+		reset();
+	}
+	//Returns the inputString
+	public String getInputString(){
+		return inputString;
+	}
+	//Returns shift
+	public int getShift(){
+		return shift;
+	}
+	//Returns the outputString
+	public String getOutputString(){
+		return outputString;
+	}
+	//Sets the shift and inputString and encodes the message
+	public String encode(int shiftAmount, String inputString){
+		reset();
+		setShift(shiftAmount);
+		setInputString(inputString);
+		return encode();
+	}
+	//Sets the shift and inputString and decodes the message
+	public String decode(int shiftAmount, String inputString){
+		reset();
+		setShift(shiftAmount);
+		setInputString(inputString);
+		return decode();
+	}
+	//Makes sure all of the variables are empty
+	public void reset(){
+		inputString = outputString = "";
+		shift = 0;
+	}
+}