# Getting Started

## What This Project Does
This repository is a small Java codebase made up of standalone classes rather than a full application stack. It looks like a set of examples or fixtures for exercising field naming, labeling, and comment patterns in source files.

There is no obvious framework, service wiring, or startup entry point. The best way to understand it is to skim the Java files in `src/main/java` and focus on the field-heavy classes and simple service-style examples.

## Recommended Reading Order
1. Start with [`.codewiki/overview.md`](.codewiki/overview.md) for the quickest high-level summary of the repository.
2. Then read the simplest source files in `src/main/java` to learn the style and conventions: [`A.java`](src/main/java/A.java), [`OrderProcessor.java`](src/main/java/OrderProcessor.java), and [`ProductService.java`](src/main/java/ProductService.java).
3. Next review the label and field-pattern examples: [`EucJpClass.java`](src/main/java/EucJpClass.java), [`MixedLabelClass.java`](src/main/java/MixedLabelClass.java), [`PartialLabelEntity.java`](src/main/java/PartialLabelEntity.java), and [`MultiPattern.java`](src/main/java/MultiPattern.java).
4. Finish with the larger mapping examples: [`LargeFieldMap.java`](src/main/java/LargeFieldMap.java) and [`LargeBusinessLabelClass.java`](src/main/java/LargeBusinessLabelClass.java).

## Key Entry Points
There are no highly-referenced classes in this repository, so there is no single dominant entry point. The most useful first files to understand are:

- [`A.java`](src/main/java/A.java) — minimal placeholder class.
- [`OrderProcessor.java`](src/main/java/OrderProcessor.java) — simple service-style example with one method.
- [`ProductService.java`](src/main/java/ProductService.java) — another small service-style class.
- [`LargeBusinessLabelClass.java`](src/main/java/LargeBusinessLabelClass.java) — the largest field example and a good reference for the repository’s labeling style.

## Project Structure
The repository is flat and intentionally simple:

```mermaid
flowchart TD
Root["Repository"] --> SrcMainJava["src/main/java"]
SrcMainJava --> AClass["A"]
SrcMainJava --> OrderProcessor["OrderProcessor"]
SrcMainJava --> ProductService["ProductService"]
SrcMainJava --> EucJpClass["EucJpClass"]
SrcMainJava --> MixedLabelClass["MixedLabelClass"]
SrcMainJava --> PartialLabelEntity["PartialLabelEntity"]
SrcMainJava --> MultiPattern["MultiPattern"]
SrcMainJava --> LargeFieldMap["LargeFieldMap"]
SrcMainJava --> LargeBusinessLabelClass["LargeBusinessLabelClass"]
```

All source lives under `src/main/java`, and the classes do not appear to depend on one another through imports or package structure. This means you can read each file independently.

## Configuration
No build files or runtime configuration files were visible in the indexed tree, so there is no confirmed Maven, Gradle, or application config to learn first. If this repository grows, look for typical Java project files at the root such as `pom.xml`, `build.gradle`, or environment-specific config files.

For now, the main “configuration” is the source itself: comments, field names, and naming patterns in each Java file define the behavior to understand.

## Common Patterns
A few patterns repeat across the codebase:

- **Plain data holders** with private string fields and minimal logic.
- **Service-style classes** such as [`OrderProcessor.java`](src/main/java/OrderProcessor.java) and [`ProductService.java`](src/main/java/ProductService.java), which currently behave like stubs.
- **Japanese field labels and comments** used heavily in [`LargeBusinessLabelClass.java`](src/main/java/LargeBusinessLabelClass.java) and [`LargeFieldMap.java`](src/main/java/LargeFieldMap.java).
- **Mixed documentation coverage** where some fields are labeled and others are not, as in [`MixedLabelClass.java`](src/main/java/MixedLabelClass.java) and [`PartialLabelEntity.java`](src/main/java/PartialLabelEntity.java).
- **Section markers** like the `ADD START` / `ADD END` block in [`MultiPattern.java`](src/main/java/MultiPattern.java).

## Practical First Steps
If you are onboarding, the fastest path is:
- skim the small classes first,
- identify how fields are named and commented,
- then use the larger classes to understand the full labeling pattern.

Once you have read the files above, you should have enough context to edit or extend the examples without needing a separate architecture overview.