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# Description of Changes This PR introduces a broad modernization of the codebase by adopting newer Java language features and improving code readability and maintainability. ## What was changed - Replaced traditional `switch` statements with modern switch expressions (`case ->`) across multiple classes. - Replaced usages of `List#get(0)` and `List#get(size - 1)` with `getFirst()` and `getLast()` respectively. - Simplified conditional logic using pattern matching (e.g., `instanceof` and switch pattern matching). - Refactored various utility and controller classes to reduce boilerplate and improve clarity. - Removed unused or redundant code (e.g., `parseClientFileIds` method in `MergeController`). - Improved type safety (e.g., using `Class::isInstance` instead of `instanceof` checks in streams). - Cleaned up Spring annotations by removing unnecessary `@Autowired` where constructor injection is already used. - Added a new test (`UIDataControllerTest`) to ensure correct handling of identical JSON configs with different filenames. - Minor formatting and style fixes (e.g., Spotless formatting adjustment). ## Why the change was made - To align the codebase with modern Java standards (Java 17+ features). - To improve readability and maintainability by reducing verbosity. - To eliminate common indexing patterns that are more error-prone. - To standardize coding style across the project. - To improve test coverage for edge cases discovered during refactoring. --- ## Checklist ### General - [ ] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [ ] I have read the [Stirling-PDF Developer Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md) (if applicable) - [ ] I have read the [How to add new languages to Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md) (if applicable) - [ ] I have performed a self-review of my own code - [ ] My changes generate no new warnings ### Documentation - [ ] I have updated relevant docs on [Stirling-PDF's doc repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/) (if functionality has heavily changed) - [ ] I have read the section [Add New Translation Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags) (for new translation tags only) ### Translations (if applicable) - [ ] I ran [`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md) ### UI Changes (if applicable) - [ ] Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR) ### Testing (if applicable) - [ ] I have run `task check` to verify linters, typechecks, and tests pass - [ ] I have tested my changes locally. Refer to the [Testing Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#7-testing) for more details. --------- Signed-off-by: Ludy87 <Ludy87@users.noreply.github.com>