The final task of industrial programming.

An application has been implemented, which consists of two parts (UI implementation and console implementation).

Console application features:

Description:

1. A file is received as input. The application automatically determines for the input file (for example, test.txt.encrypted.encrypted or test.json.zip), then the decryption and unzipping process begins until the source file with extensions .txt, .json, .xml

• IMPORTANT: the application supports cases of multi-level nesting of encryption & archiving archives, for example, test.txt.encrypted.zip.encrypted.encrypted.encrypted.zip.encrypted etc;

2. Processes the received information by searching for arithmetic expression tokens in any of the .txt, .json, .xml files;
3. Handles any arithmetic expression in brackets with any complexity (within double (4.9e-324 to 1.7e+308), also taking into account the division by 0 operation.
4. Writes data to the output file in one of the types .txt, .json, .xml depending on the input file;

The following Design Patterns are used in the console application: Strategy (to select the decryption/unarchiving strategy depending on the extension), Singleton.

FileEncryption.java

An utility that encrypts a file using AES encryption.

Technical details

This application allows you to encrypt a file using the AES encryption algorithm, asking you for a password to use it as its key. During the file transformation process, it's guaranteed that no data is lost: It's never the original file that is encrypted but a copy of it.

Functionalities

• File encryption (or safely cancel it without crashing the application)
• File decryption (or safely cancel it without crashing the application)
• Friendly graphical user interface showing the progress of the task

ZipUtility.java

ZipArchive is a simple utility class for zipping and unzipping files on windows, linux.

• Unzip zip files;
• Create zip files;
• Create large archive files;

Libraries used in the project:

1. googlecode.json.simple - for working with .json files and json objects.
2. junit-jupiter-5.8.1 - for working with unit tests.

GUI part application (based on JavaFX library):

Why JavaFX? Swing is a legacy library that fully features and provide pluggable UI components, whereas JavaFX has UI components that are still evolving with a more advanced look and feel.

Application demo:

The application interface consists of the main menu (closing the application, support for other languages), a slide-out menu of operations, TableView and a built-in editor for .txt, .json, .xml files.

The main menu consists of a MenuBox, a close button and a button for adding a new tab for parallel work with files:

The "moving out" menu of operations consists of the following operations:

1. The operation of opening a file through the built-in editor.
2. Getting the final .txt, .json, .xml file.
3. Unzipping operation.
4. Archiving operation.
5. Decryption operation.
6. Encryption operation.
7. For the convenience of working with files, the "Delete" button works, which deletes the file.

It is worth noting that when you call this menu, the rest of the application area is darkened.

TableView:

Nicely styled tableView.

Built-in editor for .txt, .json, .xml files:

There are save and open functions. ProgressBar showing the progress of opening a file. Beautiful backlight.

Libraries used in this part:

1. javafx 18
2. javafx.animation - for working with animations.
3. junit-jupiter-5.8.1 - for working with unit tests.

UI Tests: trying to use QF-Test

And of course, you can't create such a beautiful design without CSS: