# Getting Started

## What This Project Does
This codebase is a very small Java repository made up of plain classes under `src/main/java`. Most files are simple field containers with Japanese labels and comments; a couple of classes expose tiny bits of behavior such as creating an order or returning a product identifier. There is no obvious framework, persistence layer, or web layer, so treat this as a lightweight domain/example codebase rather than a full application.

## Recommended Reading Order
1. Start with [`.codewiki/overview.md`](../overview.md) to get the high-level map of the repository.
2. Read [`OrderProcessor`](../../src/main/java/OrderProcessor.java) and [`ProductService`](../../src/main/java/ProductService.java) to understand the only behavior-oriented classes.
3. Scan the field-heavy classes — [`LargeFieldMap`](../../src/main/java/LargeFieldMap.java), [`PartialLabelEntity`](../../src/main/java/PartialLabelEntity.java), [`MixedLabelClass`](../../src/main/java/MixedLabelClass.java), [`MultiPattern`](../../src/main/java/MultiPattern.java), [`EucJpClass`](../../src/main/java/EucJpClass.java), and [`LargeBusinessLabelClass`](../../src/main/java/LargeBusinessLabelClass.java) — to learn the naming and label conventions used everywhere else.
4. Finish with [`A`](../../src/main/java/A.java) as the minimal placeholder example.

## Key Entry Points
There are no highly connected classes in the catalog, so the best starting points are the small classes that actually do something:

- [`OrderProcessor`](../../src/main/java/OrderProcessor.java) — the closest thing to a business entry point, with `createOrder(String)`.
- [`ProductService`](../../src/main/java/ProductService.java) — a minimal service-style class with `getProduct()`.
- [`LargeFieldMap`](../../src/main/java/LargeFieldMap.java) — representative of the larger field-mapping style used in the repo.
- [`LargeBusinessLabelClass`](../../src/main/java/LargeBusinessLabelClass.java) — shows the repository’s large comment-heavy model style.

## Project Structure
The repository is essentially flat:

- `.codewiki/` — generated documentation and the repository map.
- `src/main/java/` — all Java source files live here.
- No packages are visible in the source files shown, so classes appear to be package-less and independent.

The code organizes itself by class name rather than by layered modules. Behavior is concentrated in a couple of small classes, while the rest of the repository is mostly data-bearing examples.

## Configuration
No build files or runtime configuration files were visible in the catalog. From the current source set, there is nothing that looks like application configuration, dependency injection setup, or environment-specific settings.

What to keep in mind:

- There is no detected `application.yml`, `application.properties`, or similar runtime config.
- There is no visible Maven or Gradle file in the surfaced repository tree.
- If you are adding code, assume plain Java classes unless you discover additional tooling elsewhere in the repo.

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

- **Simple POJO-style classes**: most files define a class with a handful of `String` fields.
- **Inline field comments**: labels are often written in Japanese directly beside fields.
- **Minimal methods**: where behavior exists, it is tiny and direct, such as returning a field or echoing an input value.
- **Flat structure**: classes do not currently show inheritance or deep collaboration chains.
- **Mixed labeling**: some classes include labeled and unlabeled fields side by side, which is useful when you are tracing naming conventions.

## Quick Orientation Tips
If you are joining the team, the fastest way to become productive is to:

- Read the overview first, then the two behavioral classes.
- Use the field-heavy classes to understand the naming scheme before making changes.
- Keep edits consistent with the existing style: small, direct, and comment-driven.

If you only have a few minutes, start with [`OrderProcessor`](../../src/main/java/OrderProcessor.java), then [`ProductService`](../../src/main/java/ProductService.java), then [`LargeFieldMap`](../../src/main/java/LargeFieldMap.java).