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# Description of Changes
- **What was changed**
- Added a Spring `@InitBinder` in `StampController` that registers a
`PropertyEditorSupport` for `MultipartFile` to safely handle text inputs
by setting the value to `null`.
- Replaced multiple `switch` statements with modern Java **switch
expressions**:
- Margin selection (`customMargin`) now uses a concise expression.
- Font selection (`alphabet` → font resource path) rewritten as an
expression.
- Position calculations (`calculatePositionX` / `calculatePositionY`)
now return via switch expressions with `yield`.
- Minor readability and maintainability improvements without changing
public API or behavior (besides the binding fix).
- **Why the change was made**
- The `@InitBinder` prevents conversion/binding issues when Spring
attempts to map string form fields to `MultipartFile`, which could cause
exceptions or unexpected behavior in multipart/form-data requests.
- Using switch expressions reduces boilerplate, clarifies intent, and
makes the control flow safer and more maintainable.
---
## Checklist
### General
- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/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)
- [x] I have performed a self-review of my own code
- [x] 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)
### 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 tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.