# Com

## Overview

The `com` package is the root Java namespace for the codebase. It serves as the top-level container under which all sub-packages, including the Optage application infrastructure, are organized. At the time of this documentation, `com` itself contains no indexed source files, classes, or methods — it functions as a pure namespace package. All actual functionality is delegated through its child module, `com.optage`, which houses the application's batch processing and SOD (Send-Out-Data) dispatch pipeline.

## Sub-module Guide

`com` delegates all behavior to its child sub-package:

- **`com.optage`** — The parent namespace for the Optage application's data-processing infrastructure. It contains a single direct child, `com.optage.kopt`, which organizes work across two sub-systems: `batch` (batch-level entry points and orchestration) and `bp` (SOD processing, validation, and dispatch). These two sub-systems are not independent; they converge on shared validation logic through `KKPRC14901`, creating a cross-cutting invariant that both pipelines must satisfy.

All classes in the Optage hierarchy are currently auto-generated fixture stubs. Method signatures and class relationships define the intended public API, but actual implementation bodies are no-op stubs waiting to be wired with production logic.

### Package hierarchy

```
com
└── com.optage
    └── com.optage.kopt
        ├── batch       (fixture entry points: KKPRC14901, KKPRC24901, KKPRC34901)
        ├── bp          (SOD processing: JKKHakkoSODCC, JKKSodSendCC, JKKHakkoSODHelper, JKKBpServiceBase)
        └── ekk         (external subsystem: EKK0301A010)
```

## Key Patterns and Architecture

### Delegation as the primary design pattern

Every class in the `com.optage.kopt` hierarchy follows a delegation pattern. Methods create instances of downstream classes and call their work methods, or remain as no-op stubs. This consistent use of delegation suggests an intended architecture where each class acts as a facade or coordinator that composes behavior from specialized components, rather than implementing logic directly.

### Validation gate pattern

`JKKHakkoSODCC` (in the `bp` subsystem) reuses `KKPRC14901.check()` as a validation gate before dispatching SOD data. This shared reference means both the `batch` and `SOD` pipelines rely on the same validation logic. Any future changes to validation should flow through `KKPRC14901.check()` to keep both pipelines in sync. This is the primary cross-cutting relationship within the package.

### Fixture scaffolding

All classes carry Javadoc indicating they are auto-generated for SPEC-SCOPED-WIKI tests. They should be treated as structural scaffolding — the method signatures and class relationships define the intended public API, while the actual implementation bodies must still be filled in. When replacing stubs with real code, preserve the declared interfaces.

### Module interaction diagram

The following diagram shows how the `com` package, its `optage` child, and the sub-modules interact:

```
flowchart TD
  Com["com
(root namespace)"] --> Optage["com.optage
(parent package)"]
  Optage --> Kopt["kopt
(batch + SOD subsystems)"]
  Kopt --> Batch["batch
fixture entry points"]
  Kopt --> Bp["bp
SOD processing"]
  Kopt --> Ekk["ekk
external subsystem"]
  Batch --> KKPRC1["KKPRC14901
primary entry"]
  Batch --> KKPRC2["KKPRC24901
stub"]
  Batch --> KKPRC3["KKPRC34901
stub"]
  KKPRC1 --> EKKClass["EKK0301A010
external handler"]
  Bp --> HakkoSOD["JKKHakkoSODCC
SOD controller"]
  Bp --> SodSend["JKKSodSendCC
SOD dispatch"]
  Bp --> HakkoHelper["JKKHakkoSODHelper
formatting"]
  Bp --> BpService["JKKBpServiceBase
shared init"]
  HakkoSOD --> SodSend
  HakkoSOD --> KKPRC1
  KKPRC1 --> Ekk
```

### Data flow

Once fully implemented, the data flow proceeds as follows:

```
flowchart LR
  Trigger["Batch trigger
or SOD job"] --> KKPRC["KKPRC14901
check() + run()"]
  KKPRC --> EKK["EKK0301A010
process()
external subsystem"]
  Trigger --> HakkoSOD["JKKHakkoSODCC
validate()"]
  HakkoSOD --> KKPRC
  HakkoSOD --> HakkoHelper["format()
normalization"]
  HakkoSOD --> SodSend["send()
SOD dispatch"]
```

## Dependencies and Integration

### Internal dependencies

- **`batch -> ekk`**: `KKPRC14901.run()` delegates to `EKK0301A010` from the `com.optage.kopt.ekk` package. This is a sibling package within `kopt`, suggesting the `ekk` subsystem is another child of the same hierarchy.
- **`bp -> batch`**: `JKKHakkoSODCC.validate()` calls into `KKPRC14901` from the sibling `batch` package. This creates an implicit dependency between `bp` and `batch`, even though they are at the same structural level.
- **`bp` internal**: `JKKHakkoSODCC` couples tightly to `JKKSodSendCC` via direct `new` instantiation, which would need refactoring to an interface-based design before production use.

### External classpath dependencies

- The `ekk` package classes (e.g., `EKK0301A010`) must be available on the classpath.
- `KKPRC14901` must be resolvable by both `batch` and `bp` consumers.

## Notes for Developers

- **Everything is a fixture.** No production logic exists in any class yet. The method signatures are the contract — replace no-ops with real implementations while preserving the declared interfaces.
- **Cross-package validation is shared through `KKPRC14901`.** When adding or modifying validation, work through this class to keep both `batch` and `bp` in sync.
- **`JKKHakkoSODCC` uses direct instantiation of `JKKSodSendCC`.** This should be refactored to an interface plus dependency injection before production use, to enable testable mocking of the send channel.
- **No data model classes exist yet.** Data currently flows as method parameters (e.g., `String` to `format()`). Design proper DTOs when moving from stubs to real implementations.
- **`KKPRC24901` and `KKPRC34901` are unused stubs.** They exist as structural placeholders; remove or implement them based on batch processing requirements.
- **`JKKHakkoSODCCTest` is a placeholder.** It asserts `true` and should be replaced with meaningful test cases once `JKKHakkoSODCC` has real behavior.
- **`com.optage` has no indexed source files.** The package itself does not contain any classes; all functionality is delegated through the `kopt` child module. This is consistent with `com.optage` being a namespace package in early stages of development.