# Getting Started

## What This Project Does
This repository is a very small Java codebase made up of a few plain classes. It looks more like a sample or documentation fixture than a full framework-based application, with simple service/processor behavior and several field-heavy data objects.

If you are new here, start by understanding the business-facing classes first, then scan the data model classes to learn the naming and labeling patterns used throughout the source.

## Recommended Reading Order
1. **[Overview](../overview.md)** — read this first for the high-level shape of the repository.
2. **[OrderProcessor](../../src/main/java/OrderProcessor.java)** — the clearest behavior-oriented entry point.
3. **[ProductService](../../src/main/java/ProductService.java)** — a minimal service-style class that shows the simplest access pattern.
4. **[LargeFieldMap](../../src/main/java/LargeFieldMap.java)** — useful for learning the domain vocabulary and field naming style.
5. **[MixedLabelClass](../../src/main/java/MixedLabelClass.java)** and **[PartialLabelEntity](../../src/main/java/PartialLabelEntity.java)** — compare these to see how labels and comments are applied inconsistently.
6. **[LargeBusinessLabelClass](../../src/main/java/LargeBusinessLabelClass.java)** — a larger version of the same field/documentation pattern.
7. **[EucJpClass](../../src/main/java/EucJpClass.java)** and **[MultiPattern](../../src/main/java/MultiPattern.java)** — read these last for localized-label and comment-pattern examples.

## Key Entry Points
The repository index does not surface any highly referenced classes, so there is no single dominant abstraction to learn first. The best entry points are the classes that already show behavior or core data structure patterns:

- **[OrderProcessor](../../src/main/java/OrderProcessor.java)** — creates orders and is the most likely business workflow anchor.
- **[ProductService](../../src/main/java/ProductService.java)** — exposes the simplest service-style API.
- **[LargeFieldMap](../../src/main/java/LargeFieldMap.java)** — a representative dense field container.
- **[LargeBusinessLabelClass](../../src/main/java/LargeBusinessLabelClass.java)** — the clearest example of a large labeled data object.

## Project Structure
The repository is essentially a flat source set:

- **`.codewiki/`** — generated documentation for the codebase.
- **`src/main/java/`** — all visible Java source files live here.
- There is no obvious package tree, framework module layout, or test directory in the indexed files.

A quick mental model of the code is:

```mermaid
flowchart LR
Root["Repository"] --> Java["Java source files"]
Java --> OrderProcessor["OrderProcessor"]
Java --> ProductService["ProductService"]
Java --> DataModels["Label and field mapping classes"]
DataModels --> LargeFieldMap["LargeFieldMap"]
DataModels --> LargeBusinessLabelClass["LargeBusinessLabelClass"]
DataModels --> MixedLabelClass["MixedLabelClass"]
DataModels --> PartialLabelEntity["PartialLabelEntity"]
DataModels --> EucJpClass["EucJpClass"]
DataModels --> MultiPattern["MultiPattern"]
DataModels --> A["A"]
```

## Configuration
No build tool or runtime configuration files are obvious from the indexed files. If you are trying to understand how the code runs, check for these files first if they exist in the broader repository:

- **`pom.xml`** or **`build.gradle`** — build and dependency configuration.
- **`application.properties`** / **`application.yml`** — runtime settings, if this grows into an application.
- **`.gitignore`** — what generated files and local artifacts are excluded.
- **`README`** or additional `.codewiki/` pages — project-specific setup notes.

At the moment, the visible source looks self-contained and relies mainly on standard Java classes.

## Common Patterns
A few patterns repeat across the source set:

- **Plain Java classes** with very little framework usage.
- **Simple accessors and stub-like behavior**, such as returning a field or method argument directly.
- **Field-heavy data containers** with many `String` properties.
- **Inline comments used as labels**, including Japanese text in several model classes.
- **Mixed documentation coverage**, where some fields are labeled and others are not.
- **Minimal logic, maximal naming signal** — most of what matters is the class and field naming, not control flow.

## Practical First Steps
If you just joined the team, do this in order:

1. Read **[Overview](../overview.md)** to understand the repository at a glance.
2. Open **[OrderProcessor](../../src/main/java/OrderProcessor.java)** and **[ProductService](../../src/main/java/ProductService.java)** to see the behavior-oriented types.
3. Scan **[LargeFieldMap](../../src/main/java/LargeFieldMap.java)** and **[LargeBusinessLabelClass](../../src/main/java/LargeBusinessLabelClass.java)** to learn the data-shape conventions.
4. Check whether a build file or test suite exists outside the indexed files before making changes.
5. If you need to extend the model, follow the existing naming and comment style so your additions fit the rest of the codebase.