# Business Logic — FUW07101SF03DBean.listKoumokuIds() [5 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.FUW07101SF.FUW07101SF03DBean` |
| Layer | Utility / Data Bean (webview package) |
| Module | `FUW07101SF` (Package: `eo.web.webview.FUW07101SF`) |

## 1. Role

### FUW07101SF03DBean.listKoumokuIds()

This method provides a static factory that returns a predefined list of field names (item IDs) used by a data-type bean in the web view layer. The data-type bean pattern is commonly used in enterprise Japanese IT systems to carry structured form data between presentation and business logic layers — this method populates the metadata describing which fields the bean contains. Specifically, `listKoumokuIds()` returns a list containing a single item: "送信先メールアドレス" (Transmission destination email address). This enables calling screens or services to dynamically iterate over the bean's fields for generic UI rendering, form validation, or data export operations. The method follows a simple builder design pattern with no conditional logic, making it a shared utility accessible from any component within the module.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["listKoumokuIds()"])
    STEP1["Create new ArrayList<String>"]
    STEP2["Add 送信先メールアドレス"]
    END_NODE["Return list"]

    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> END_NODE
```

**CRITICAL — Constant Resolution:**
No constant resolution required. The string `"送信先メールアドレス"` is a literal value, not a constant reference.

**Requirements:**
- Linear processing with no conditional branches.
- Simple two-step construction: instantiate the list, populate with one item, return.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | - |

No parameters — this is a parameterless static factory method. It returns a fixed, hardcoded list of item names for the data-type bean.

| # | Type | Business Description |
|---|------|---------------------|
| 1 | Return Value | `ArrayList<String>` — List of item names (field labels) for the data-type bean. Contains one entry. |

## 4. CRUD Operations / Called Services

This method performs no CRUD operations and calls no external services. It is a pure data factory — it constructs and returns a local `ArrayList` with one hardcoded string value. No database access, no SC (Service Component) invocations, no entity operations.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| — | — | — | — | No service or database operations performed |

## 5. Dependency Trace

No callers were found across the codebase. This method may be referenced by screens or services that are outside the scanned source tree, or it may be invoked via reflection (e.g., Spring bean methods or generic UI frameworks that call `listKoumokuIds()` by name to populate form field lists).

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

## 6. Per-Branch Detail Blocks

**Block 1** — [SET] `(List construction)` (L179)

> Initializes a new mutable ArrayList to hold the item name strings.

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

**Block 2** — [EXEC] `(Populate list)` (L181)

> Adds the single field label to the list. The string "送信先メールアドレス" represents the email address field used for specifying transmission destinations.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `koumokuList.add("送信先メールアドレス");` // Add field label to list |

**Block 3** — [RETURN] `(Return result)` (L182)

> Returns the populated list to the caller.

| # | Type | Code |
|---|------|------|
| 1 | RETURN | `return koumokuList;` // Return list of item names |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `koumoku` | Field (Japanese) | Item / field — refers to individual data fields in a form or bean |
| 送信先メールアドレス | Japanese literal | Transmission destination email address — the email address to which data (e.g., notifications, reports) is sent |
| DBean (Data Bean) | Acronym | Data transfer object used in the webview layer to carry form data between the presentation layer and business logic |
| FUW07101SF | Module | A screen/service module within the `eo.web.webview` package, likely handling a specific web functionality (SF suffix typically denotes "Screen Function" in this codebase) |
| webview | Package / Layer | The web presentation layer responsible for rendering views and handling HTTP-level data binding |