First Commit.

Model classes, and concrete product classes crated

model/AlgBase.java

@@ -0,0 +1,56 @@
+package model;
+
+import java.io.*;
+
+public abstract class AlgBase {
+    public String data;
+
+    public void encrypt(File inputFile, File outputFile) {
+        readData(inputFile);
+        encode();
+        writeData(outputFile);
+    }
+
+    public void decrypt(File inputFile, File outputFile) {
+        readData(inputFile);
+        decode();
+        writeData(outputFile);
+    }
+
+    public abstract void encode();
+
+    public abstract void decode();
+
+    private void readData(File inputFile) {
+        if ("".equals(data)) {
+            if (inputFile != null) {
+                readMsg(inputFile);
+            }
+        }
+    }
+
+    public void readMsg(File inputFile) {
+        try (BufferedReader reader = new BufferedReader(new FileReader(inputFile))) {
+            StringBuilder msg = new StringBuilder();
+            String line;
+            while ((line = reader.readLine()) != null) {
+                msg.append(line);
+            }
+            data = msg.toString();
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private void writeData(File outputFile) {
+        if (outputFile != null) {
+            try (FileWriter writer = new FileWriter(outputFile)) {
+                writer.write(data);
+            } catch (IOException e) {
+                System.out.println(e.getMessage());
+            }
+        } else {
+            System.out.println(data);
+        }
+    }
+}

product/AlgShift.java

@@ -0,0 +1,58 @@
+package product;
+
+import model.AlgBase;
+
+public class AlgShift extends AlgBase {
+    String mode;
+    int key;
+
+    public AlgShift(String data, String mode, int key) {
+        this.data = data;
+        this.mode = mode;
+        this.key = key;
+    }
+
+    @Override
+    public void decode() {
+        StringBuilder decryptedMsg = new StringBuilder(data);
+        for (int i = 0; i < decryptedMsg.length(); i++) {
+            String s = decryptedMsg.substring(i, i + 1);
+            if (s.matches("[a-z]")) {
+                char c = (char) (decryptedMsg.charAt(i) - key);
+                if (c < 'a') {
+                    c = (char) ('z' + c - 'a' + 1);
+                }
+                decryptedMsg.setCharAt(i, c);
+            } else if (s.matches("[A-Z]")) {
+                char c = (char) (decryptedMsg.charAt(i) - key);
+                if (c < 'A') {
+                    c = (char) ('Z' + c - 'A' + 1);
+                }
+                decryptedMsg.setCharAt(i, c);
+            }
+        }
+        data = decryptedMsg.toString();
+    }
+
+    @Override
+    public void encode() {
+        StringBuilder encryptedMsg = new StringBuilder(data);
+        for (int i = 0; i < encryptedMsg.length(); i++) {
+            String s = encryptedMsg.substring(i, i + 1);
+            if (s.matches("[a-z]")) {
+                char c = (char) (encryptedMsg.charAt(i) + key);
+                if (c > 'z') {
+                    c = (char) ('a' + c - 'z' - 1);
+                }
+                encryptedMsg.setCharAt(i, c);
+            } else if (s.matches("[A-Z]")) {
+                char c = (char) (encryptedMsg.charAt(i) + key);
+                if (c > 'Z') {
+                    c = (char) ('A' + c - 'Z' - 1);
+                }
+                encryptedMsg.setCharAt(i, c);
+            }
+        }
+        data = encryptedMsg.toString();
+    }
+}

product/AlgUnicode.java

@@ -0,0 +1,32 @@
+package product;
+
+import model.AlgBase;
+
+public class AlgUnicode extends AlgBase {
+    String mode;
+    int key;
+
+    public AlgUnicode(String data, String mode, int key) {
+        this.data = data;
+        this.mode = mode;
+        this.key = key;
+    }
+
+    @Override
+    public void encode() {
+        StringBuilder encryptedMsg = new StringBuilder();
+        for (int i = 0; i < data.length(); i++) {
+            encryptedMsg.append((char) (data.charAt(i) + key));
+        }
+        data = encryptedMsg.toString();
+    }
+
+    @Override
+    public void decode() {
+        StringBuilder encryptedMsg = new StringBuilder();
+        for (int i = 0; i < data.length(); i++) {
+            encryptedMsg.append((char) (data.charAt(i) - key));
+        }
+        data = encryptedMsg.toString();
+    }
+}