# Business Logic — FUW00116SF01DBean.listKoumokuIds() [6 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.FUW00116SF.FUW00116SF01DBean` |
| Layer | Controller (Web View Bean / Data Type Bean) |
| Module | `FUW00116SF` (Package: `eo.web.webview.FUW00116SF`) |

## 1. Role

### FUW00116SF01DBean.listKoumokuIds()

This method serves as a **data-type bean metadata provider** within the K-Opticom web application framework. It returns a fixed list of field identifier strings (項目名 — "item names") that are used by the Futurity X33 framework to register which data columns/fields are active in the associated view bean (`FUW00116SF01DBean`). In business terms, it declares the set of email-related data fields that the screen layer can read, display, or process — specifically the recipient email address and the email address setting field code. This is a shared utility method following the **metadata-provider design pattern**, acting as a contract between the data-type bean and the X33VListedBeanInterface framework. It has no parameters, performs no external I/O, and is entirely self-contained. It is a static factory that produces a constant list.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["listKoumokuIds()"])
    STEP1["Create new ArrayList<String> koumokuList"]
    STEP2["Add Recipient Email Address to list"]
    STEP3["Add Email Address Setting Field Code to list"]
    RETURN["Return koumokuList"]
    END_NODE(["Return / Next"])

    START --> STEP1 --> STEP2 --> STEP3 --> RETURN --> END_NODE
```

The method follows a linear, no-branch processing pattern. It instantiates an `ArrayList<String>`, adds two hardcoded Japanese field name strings to the list (one per line), and returns the list. There are no conditional branches, loops, or external calls.

**No constant resolution required** — the method uses literal Japanese strings directly rather than referencing named constants.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This method takes no parameters; it returns a constant, pre-defined list. |

**External state / instance fields read:** None. The method is `static`, takes no arguments, and accesses no instance fields. It is entirely stateless.

## 4. CRUD Operations / Called Services

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| (none) | — | — | — | No CRUD operations or external service calls. This method is a pure data provider. |

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | (none found) | — | — | No callers found in the codebase via static search. This method is likely invoked dynamically by the X33 framework at runtime through reflection or interface contracts (X33VListedBeanInterface). |

The method is declared `public static`, meaning any caller can invoke it. However, no direct caller was found via source-level search. The X33 framework (`com.fujitsu.futurity.web.x33.beans.X33VListedBeanInterface`) likely discovers and calls this method via reflection as part of its bean initialization process.

## 6. Per-Branch Detail Blocks

> The method has no conditional branches, loops, or error-handling blocks. It follows a single linear execution path.

**Block 1** — [PROCESS] `(linear execution, no conditions)` (L227)

> Create and populate the list of field name identifiers.

| # | Type | Code |
|---|------|------|
| 1 | SET | `ArrayList<String> koumokuList = new ArrayList<String>();` // Declare and instantiate a new ArrayList to hold field name strings [-> 項目名のリスト] |
| 2 | CALL | `koumokuList.add("受信先メールアドレス");` // Add "Recipient Email Address" field identifier to the list |
| 3 | CALL | `koumokuList.add("メールアドレス設定フィールドコード");` // Add "Email Address Setting Field Code" field identifier to the list |

**Block 2** — [RETURN] `(return statement)` (L231)

> Return the populated list to the caller.

| # | Type | Code |
|---|------|------|
| 1 | RETURN | `return koumokuList;` // Return the list of item name identifiers [-> 項目名のリスト] |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `koumoku` | Field (Japanese: 項目) | Item / field — refers to a data field or column name within a screen or data view |
| `koumokuList` | Field | List of field names (item name identifiers) for the data-type bean |
| 受信先メールアドレス | Japanese | Recipient Email Address — the email address that receives notifications or messages |
| メールアドレス設定フィールドコード | Japanese | Email Address Setting Field Code — a code identifier used to configure or reference the email address setting field on a screen |
| X33VListedBeanInterface | Technical | Futurity X33 framework interface for data-type beans that provide structured field metadata to the view layer |
| X33VViewBaseBean | Technical | Base class in the Futurity X33 framework; provides common view bean functionality |
| FUW00116SF | Module | A web view module within the K-Opticom system (likely related to email address management — "FU" = Web, "W" = Web, "00116" = module number) |
| DBean | Technical | Data Bean — a view-layer bean used for passing data between the screen and the business layer |
| ArrayList<String> | Technical | Java dynamic array holding strings — in this context, it holds the field identifier strings for the data-type bean |