# Getting Started

## What This Project Does

This repository is a small plain-Java codebase centered on a few domain-style classes and two lightweight behavior classes. It looks more like a sample or reference project than a full application, with a focus on simple data holders, naming patterns, and label/comment examples. The code is intentionally minimal, so the fastest way to understand it is to read the classes directly.

## Recommended Reading Order

1. [`overview.md`](../overview.md) — start here for the high-level repo summary and architecture notes.
2. [`src/main/java/OrderProcessor.java`](../../src/main/java/OrderProcessor.java) — read this first for the clearest example of business logic.
3. [`src/main/java/ProductService.java`](../../src/main/java/ProductService.java) — read this next for the simplest service-style class.
4. [`src/main/java/MixedLabelClass.java`](../../src/main/java/MixedLabelClass.java) and [`src/main/java/PartialLabelEntity.java`](../../src/main/java/PartialLabelEntity.java) — use these to understand mixed field/comment labeling.
5. [`src/main/java/LargeFieldMap.java`](../../src/main/java/LargeFieldMap.java) and [`src/main/java/LargeBusinessLabelClass.java`](../../src/main/java/LargeBusinessLabelClass.java) — these show larger field sets and annotation/comment conventions.
6. [`src/main/java/EucJpClass.java`](../../src/main/java/EucJpClass.java) and [`src/main/java/MultiPattern.java`](../../src/main/java/MultiPattern.java) — review these for additional naming and encoding-related patterns.
7. [`src/main/java/A.java`](../../src/main/java/A.java) — this appears to be a minimal stub or placeholder.

## Key Entry Points

The main behavior-bearing classes are:

- [`OrderProcessor`](../../src/main/java/OrderProcessor.java) — order creation entry point; the clearest place to start when you want to understand the intended flow.
- [`ProductService`](../../src/main/java/ProductService.java) — a minimal service example that shows how state is exposed.

Most other classes are data-oriented examples rather than orchestration points.

## Project Structure

The repository is very flat:

- `src/main/java/` contains all Java sources.
- There is no visible package hierarchy in the indexed files.
- Most classes are standalone and independent.
- `OrderProcessor` and `ProductService` contain the only obvious behavior.
- The rest of the classes are simple field containers or label-heavy examples.

A simple mental model is:

```mermaid
flowchart TD
    Repo["Repository"] --> Source["src/main/java"]
    Source --> OrderProcessor["OrderProcessor"]
    Source --> ProductService["ProductService"]
    Source --> DataClasses["Data-style classes"]
    DataClasses --> A["A"]
    DataClasses --> EucJpClass["EucJpClass"]
    DataClasses --> LargeBusinessLabelClass["LargeBusinessLabelClass"]
    DataClasses --> LargeFieldMap["LargeFieldMap"]
    DataClasses --> MixedLabelClass["MixedLabelClass"]
    DataClasses --> MultiPattern["MultiPattern"]
    DataClasses --> PartialLabelEntity["PartialLabelEntity"]
```

## Configuration

No major build or runtime configuration files were visible in the indexed sources. That usually means one of two things:

- the project is intentionally lightweight and has no special configuration, or
- the interesting config files live outside the small source slice shown here.

What to check first if you need setup details:

- build files such as `pom.xml` or `build.gradle`
- Java source encoding settings if you work with `EucJpClass`
- any repo-level documentation under `.codewiki/`

For now, treat the project as plain Java with no framework-specific bootstrap.

## Common Patterns

- **Plain classes over frameworks** — the code relies on direct Java classes rather than framework abstractions.
- **Simple method bodies** — behavior methods are short and easy to trace, often returning or passing through values.
- **Field-centric models** — many classes are mostly private fields with little logic.
- **Label/comment-heavy examples** — several classes include Japanese labels or comments, likely for documentation or parsing tests.
- **Minimal coupling** — classes appear independent, so you usually do not need to chase deep dependency chains.

## How to Start Reading

If you have just joined the team, use this order:

1. Read [`overview.md`](../overview.md) to get the big picture.
2. Open [`OrderProcessor`](../../src/main/java/OrderProcessor.java) and [`ProductService`](../../src/main/java/ProductService.java).
3. Skim the field-heavy classes to learn the naming and comment style.
4. Only then dig into any files you need to modify.

If you are about to make a change, first decide whether it belongs in a behavior class like `OrderProcessor` or in one of the data-style classes that mostly exist to hold fields and labels.