# Business Logic — KKW00810SF03DBean.listKoumokuIds() [10 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.KKW00810SF.KKW00810SF03DBean` |
| Layer | Web (Data Bean / View Controller Support) |
| Module | `KKW00810SF` (Package: `eo.web.webview.KKW00810SF`) |

## 1. Role

### KKW00810SF03DBean.listKoumokuIds()

This method serves as a **data type view bean field catalog provider** for the KKW00810SF screen module. It returns a predefined `ArrayList<String>` of item name (field label) strings that represent the columns displayed in a data-type view screen within the service management UI. The method implements the **provider pattern** — it is a shared, static factory that other screen beans delegate to, mirroring the same `listKoumokuIds()` method found across sibling DBean classes (e.g., `FUW00912SF01DBean`, `FUW00926SF01DBean`, `FUW00959SF01DBean`), each of which returns its own domain-specific set of field labels. Its role in the larger system is to provide the **column header metadata** required by view screens to render tabular data with the correct field ordering and display names in Japanese. The method handles no conditional branches and performs no database or service calls — it is a pure data factory that returns a fixed set of six service-contract-related field names.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["listKoumokuIds()"])
    INIT["Create ArrayList<String> koumokuList"]
    ADD1["Add: サービス契約ステータス
(Service Contract Status)"]
    ADD2["Add: サービスコード
(Service Code)"]
    ADD3["Add: 料金グループコード
(Fee Group Code)"]
    ADD4["Add: 料金コースコード
(Fee Course Code)"]
    ADD5["Add: 料金プランコード
(Fee Plan Code)"]
    ADD6["Add: サービス開始年月日
(Service Start Date)"]
    RET["Return koumokuList"]
    END(["Return / Next"])

    START --> INIT
    INIT --> ADD1
    ADD1 --> ADD2
    ADD2 --> ADD3
    ADD3 --> ADD4
    ADD4 --> ADD5
    ADD5 --> ADD6
    ADD6 --> RET
    RET --> END
```

**Processing Summary:**
1. Instantiate a new `ArrayList<String>` named `koumokuList`.
2. Append six fixed Japanese field name literals representing service-contract domain attributes, in a fixed order.
3. Return the populated list to the caller.

No conditional branches, no loops, no external calls. The method is a linear, deterministic factory.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This method takes no parameters. It is a static factory that returns a constant set of field names. |

**Instance Fields / External State:**
- None. This method reads no instance fields or external state. It is entirely self-contained.

## 4. CRUD Operations / Called Services

This method performs **no CRUD operations** and calls **no service components (SC), Common Business Services (CBS), or data access methods**. It is a pure in-memory list builder that constructs a static set of display labels.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| — | — | — | — | No service or data access calls. This method is a pure data factory. |

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| — | No callers found | — | — |

**Note:** No files in the codebase reference `KKW00810SF03DBean.listKoumokuIds()`. The method is defined but unused in the current codebase. Sibling modules (e.g., `FUW00912SF`, `FUW00926SF`, `FUW00959SF`, `FUW00964SF`) each define their own `listKoumokuIds()` variants in DBean classes, but none delegate to this KKW00810SF variant. It is likely a template or an unused artifact.

## 6. Per-Branch Detail Blocks

**Block 1** — [SET] `(ArrayList instantiation)` (L416)

> Create an empty ArrayList for the field name list.

| # | Type | Code |
|---|------|------|
| 1 | SET | `koumokuList = new ArrayList<String>();` // Initialize empty list for field names |

**Block 2** — [EXEC] `(Add field name literals)` (L417–L422)

> Append six fixed Japanese field names to the list, representing the columns of a service-contract data-type view screen.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `koumokuList.add("サービス契約ステータス");` // Add: Service Contract Status [-> field index 0] |
| 2 | EXEC | `koumokuList.add("サービスコード");` // Add: Service Code [-> field index 1] |
| 3 | EXEC | `koumokuList.add("料金グループコード");` // Add: Fee Group Code [-> field index 2] |
| 4 | EXEC | `koumokuList.add("料金コースコード");` // Add: Fee Course Code [-> field index 3] |
| 5 | EXEC | `koumokuList.add("料金プランコード");` // Add: Fee Plan Code [-> field index 4] |
| 6 | EXEC | `koumokuList.add("サービス開始年月日");` // Add: Service Start Date [-> field index 5] |

**Block 3** — [RETURN] `(Return the populated list)` (L423)

> Return the completed list of field names to the caller.

| # | Type | Code |
|---|------|------|
| 1 | RETURN | `return koumokuList;` // Return ArrayList<String> containing six field name labels |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `koumokuList` | Field | Item name list — the Java variable holding the list of field label strings |
| DBean | Acronym | Data Bean — a view-layer bean class that holds data structures for screen display (e.g., `KKW00810SF03DBean`) |
| サービス契約ステータス | Field | Service Contract Status — the current state of a service contract (e.g., active, canceled, pending) |
| サービスコード | Field | Service Code — a unique identifier for a telecom service offering |
| 料金グループコード | Field | Fee Group Code — groups related fee items together for billing aggregation |
| 料金コースコード | Field | Fee Course Code — identifies a specific fee plan course or tier |
| 料金プランコード | Field | Fee Plan Code — identifies the exact billing plan applied to a service contract |
| サービス開始年月日 | Field | Service Start Date — the date (year-month-day) when the service was activated |
| listKoumokuIds | Method | List Item IDs — a common naming convention for methods that return field label arrays for view beans |
| KKW00810SF | Module | Screen module identifier — a service management view screen module in the webview layer |