# Getting Started

Welcome to the team. This guide will help you orient yourself in the codebase quickly.

## What This Project Does

This repository is a small Java codebase consisting of six standalone classes that serve as reference examples or test fixtures for Java source file header patterns. Each class demonstrates a different style of file-level documentation comment — from fully-documented MIT license blocks and extensive version changelogs to minimal Japanese-language metadata and entirely bare-no-header styles. The project appears to be used as input for tools that process or analyze Java file headers.

## Recommended Reading Order

If you're new to this codebase, read the classes in this order:

1. **NoHeader.java** — The simplest entry point: three lines, no comments, no distractions. Shows the baseline case.
2. **MitLicense.java** — A three-line MIT License header. Demonstrates the most common standard header style.
3. **PartialHeader.java** — Introduces Japanese-language metadata with a module name and functional summary.
4. **Crosslink.java** — Adds a version-tagged header with an embedded field placeholder and an `ANK-` ticketing format.
5. **WithHeader.java** — A more complete header with a service-level description (`SODCC Issuance`) and a versioned change log.
6. **LongHeader.java** — The full file (258 lines) featuring 257 version-change lines (`v01.00.00` through `v250.00.00`). Shows how extensive version history comments look in practice.

## Key Entry Points

All six classes live in the same package root with no inter-class dependencies:

| File | Purpose | Header Style |
|------|---------|-------------|
| [Crosslink.java](src/main/java/Crosslink.java) | Versioned changelog header with embedded field | `ANK-` ticketing format |
| [LongHeader.java](src/main/java/LongHeader.java) | 257-line version history (largest file) | Extended changelog |
| [MitLicense.java](src/main/java/MitLicense.java) | Standard MIT License header | License block |
| [NoHeader.java](src/main/java/NoHeader.java) | No file-level comment at all | None (control case) |
| [PartialHeader.java](src/main/java/PartialHeader.java) | Short Japanese-language metadata | Partial block |
| [WithHeader.java](src/main/java/WithHeader.java) | Fully formatted header with service description | Complete header |

Start with `NoHeader.java` or `MitLicense.java` for the simplest files. Work up to `LongHeader.java` last, since it is the most historically dense class in the repository.

## Project Structure

The codebase is intentionally flat — all six classes reside in a single directory with no packages, sub-modules, or layering:

```mermaid
flowchart LR
    Sub["Source Directory"] --> java["src/main/java/"]
    java --> crosslink["Crosslink"]
    java --> longheader["LongHeader"]
    java --> mitlicense["MitLicense"]
    java --> noheader["NoHeader"]
    java --> partialheader["PartialHeader"]
    java --> withheader["WithHeader"]
```

Each class is fully independent: none imports or references another. There are no modules, no packages beyond the root, and no runtime dependencies between components.

## Configuration

This project has no build scripts or configuration files visible in the repository:

- **No `pom.xml`** — no Maven project configuration.
- **No `build.gradle`** — no Gradle build configuration.
- **No `src/test/` directory** — no unit or integration tests.
- **No `src/main/resources`** — no configuration properties or resource files.

If you need to compile or run this code, set up a standard Java development environment (JDK 8+) and compile the classes manually from `src/main/java/`. The license is MIT, as indicated by [MitLicense.java](src/main/java/MitLicense.java).

## Common Patterns

Since this is a small, flat project, the patterns to be aware of are stylistic rather than architectural:

- **All classes are empty-bodied** — none of the six classes declare constructors, methods, or instance fields (beyond one `String field` in `Crosslink.java`). They exist purely as header examples.
- **Javadoc-style headers** — documentation comments use `/** ... */` blocks at the top of each file. The depth and format of these headers is the primary variable across classes.
- **`ANK-` ticketing format** — versioned headers (`Crosslink.java`, `WithHeader.java`, `LongHeader.java`) use a structured `ANK-1000-xxx-00` ticket pattern with author attribution (e.g., `X.Nguyen`).
- **Multi-language support** — `PartialHeader.java` and `WithHeader.java` include Japanese-language metadata, demonstrating the project's awareness of localized documentation standards.
- **MIT License** — `MitLicense.java` follows the standard MIT License template with 2024 copyright. This is the project-wide license.

## Next Steps

After reading through the six classes in the recommended order:

- Check the [Repository Overview](../overview.md) for a deeper architectural breakdown.
- Look at each class's header to understand the spectrum of documentation styles used as reference material.
- If you are using these as test fixtures for a header-processing tool, start with `NoHeader.java` and `MitLicense.java` as your edge cases (no header, minimal header), then move to the more complex examples.