# Getting Started

## What This Project Does
This repository is a small Java codebase made up of plain domain-style classes and a few business-flavored entry points. It appears to model simple order and product operations alongside several label-heavy sample entities, likely for demonstration, testing, or documentation purposes.

There is no obvious framework, server, or persistence layer in the current source set, so the code is intentionally lightweight. New engineers should focus on understanding the domain classes and their naming/labeling patterns rather than looking for complex application wiring.

## Recommended Reading Order
1. [Repository overview](../overview.md) — start here for the big picture and module map.
2. [Project tree](../tree.json) — use this to confirm what source files exist and where they live.
3. This guide — read it last to orient yourself before diving into source.

## Key Entry Points
The repository snapshot does not show any highly referenced classes, so there is no single dominant abstraction to learn first. The most useful starting points are the business-facing classes:

- [OrderProcessor](../../src/main/java/OrderProcessor.java) — the clearest process-oriented class, with a simple `createOrder` method.
- [ProductService](../../src/main/java/ProductService.java) — a compact service-style class with a product getter.

If you are trying to understand the field-labeling examples, also skim:

- [LargeFieldMap](../../src/main/java/LargeFieldMap.java)
- [LargeBusinessLabelClass](../../src/main/java/LargeBusinessLabelClass.java)
- [MixedLabelClass](../../src/main/java/MixedLabelClass.java)
- [PartialLabelEntity](../../src/main/java/PartialLabelEntity.java)
- [EucJpClass](../../src/main/java/EucJpClass.java)
- [MultiPattern](../../src/main/java/MultiPattern.java)

## Project Structure
The codebase is organized as a flat set of Java source files under `src/main/java`. There is no visible package hierarchy in the current snapshot, so each class stands mostly on its own.

At a glance:

- `OrderProcessor` and `ProductService` are the most business-oriented classes.
- `LargeFieldMap`, `LargeBusinessLabelClass`, `MixedLabelClass`, `PartialLabelEntity`, `EucJpClass`, and `MultiPattern` are sample/model classes with many fields or comments.
- `A` appears to be a minimal placeholder class.

## Configuration
No application configuration files were detected in the repository snapshot. That means there is no obvious `application.yml`, properties file, build config, or framework-specific setup to learn first.

When working in this codebase, check for these kinds of files if they are added later:

- Build configuration: `pom.xml`, `build.gradle`, or `settings.gradle`
- Runtime configuration: `application.properties`, `application.yml`, or environment-specific files
- Encoding or formatting rules: editorconfig, lint, or formatter settings

## Common Patterns
The source favors simple, direct Java constructs:

- **Plain fields and getters** rather than deep object graphs or service layers.
- **Minimal method logic** — for example, `OrderProcessor#createOrder` currently returns the provided order ID unchanged.
- **Field-name-driven examples** — several classes emphasize naming conventions and label comments more than behavior.
- **Mixed-language comments** — Japanese field labels appear throughout some model classes, so be prepared to work with multilingual source notes.
- **Low coupling** — classes appear independent, so changes in one file are unlikely to cascade widely.

## Where to Go Next
After you have read the overview and skimmed the entry points, open the specific model class relevant to your task. If you are modifying order behavior, start with `OrderProcessor`; if you are changing product-facing logic, start with `ProductService`; if you are working on field naming or label mapping, start with `LargeFieldMap` and `LargeBusinessLabelClass`.