---
title: "Business Logic — FUW00156SF01DBean.listKoumokuIds()"
layer: Data Bean
module: "FUW00156SF"
package: "eo.web.webview.FUW00156SF"
sourceFile: "source/koptWebF/src/eo/web/webview/FUW00156SF/FUW00156SF01DBean.java"
sourceLines: "194-198"
javadoc: "データタイプビーンの項目名のリストを返す。 (Returns the list of item names of the data type bean.)"
---

# Business Logic — FUW00156SF01DBean.listKoumokuIds() [5 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.FUW00156SF.FUW00156SF01DBean` |
| Layer | Data Bean (inferred from package `eo.web.webview.FUW00156SF` and class naming convention — `01DBean` denotes a data-type definition bean) |
| Module | `FUW00156SF` (Package: `eo.web.webview.FUW00156SF`) |

## 1. Role

### FUW00156SF01DBean.listKoumokuIds()

This method serves as a **data-type bean field catalog** for the "Data Retrieval Account Number" (`データ取得用アカウント番号`) entity within the FUW00156SF module. In this enterprise application framework, each data-type bean exposes a static `listKoumokuIds()` method that returns the list of Japanese field labels — essentially a metadata registry of what columns/fields the bean carries. The FUW00156SF01DBean represents a single-item data structure whose sole business field is the **account number** (`アカウント番号`), which is an internal identifier for telecom service account records. This method implements the **Registry Pattern**, providing a lookup mechanism that allows the parent business bean (`FUW00156SFBean`) to dynamically resolve what item labels belong to this data-type bean, enabling generic list rendering and column header generation in the web presentation layer. The method is static, stateless, and has no side effects — it is a pure metadata consumer, called by `FUW00156SFBean.listKoumokuIds(String key)` when the incoming key matches `"データ取得用アカウント番号"`. Its role in the larger system is to support **polymorphic list-type fields** — the bean framework uses this catalog to generate dynamic form columns, data grids, and export headers without hardcoding field names at the screen level.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["listKoumokuIds()"])
    STEP1["Create ArrayList<String> koumokuList"]
    STEP2["Add Account Number to koumokuList"]
    RETURN1["Return koumokuList"]

    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> RETURN1
```

This method is a simple linear sequence with no conditional branches or loops. It constructs a field-name catalog list for the data-type bean and returns it.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This is a static, no-argument method. No input parameters are required because it returns a fixed catalog of field labels intrinsic to the `FUW00156SF01DBean` data-type definition. |

## 4. CRUD Operations / Called Services

This method performs **no database operations, no service component calls, and no entity access**. It is a pure in-memory data structure constructor that creates and populates a `List<String>` with field label metadata.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| (none) | — | — | — | No CRUD operations — this method is a pure metadata catalog that returns a fixed list of Japanese field label strings. |

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Bean: FUW00156SFBean | `FUW00156SFBean.listKoumokuIds(key)` where `key.equals("データ取得用アカウント番号")` → `FUW00156SF01DBean.listKoumokuIds()` | (none — pure metadata catalog) |

This method is called exclusively from the same module's parent business bean `FUW00156SFBean`, which acts as a **dispatcher** (router). When the bean framework invokes `listKoumokuIds(String key)` on `FUW00156SFBean` with the key `"データ取得用アカウント番号"` (the item ID for "Data Retrieval Account Number"), the bean delegates to the static method of `FUW00156SF01DBean`. The parent bean is itself a generic list-management bean that handles multiple sub-type beans (`FUW00156SF01DBean` through `FUW00156SF07DBean`) for different account-related data structures.

## 6. Per-Branch Detail Blocks

This method has no conditional branches — it is a linear execution path.

**Block 1** — [LINEAR EXECUTION] `(no condition)` (L196)

> This block executes unconditionally. It constructs a field-name catalog for the data-type bean.

| # | Type | Code |
|---|------|------|
| 1 | SET | `ArrayList<String> koumokuList = new ArrayList<String>();` // Create new mutable list to hold field label strings [-> Data structure: ArrayList<String>] |
| 2 | EXEC | `koumokuList.add("アカウント番号") ;` // Add the single field label "Account Number" (Japanese) to the list |
| 3 | RETURN | `return koumokuList;` // Return the list containing one Japanese label string |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `データタイプビーン` (Data Type Bean) | Concept | A Java bean class whose sole purpose is to define the structure (field names and types) of a data record used in list-type UI components. Named with the suffix `DBean` in this codebase (e.g., `FUW00156SF01DBean`). |
| `項目名` (Koumoku-me / Item Name) | Field | A human-readable label for a data field, used as column headers in web grids and forms. The `listKoumokuIds()` method returns these labels. |
| `アカウント番号` (Account Number) | Field | The account number label — represents a telecom service account identifier. This is the sole field in the `FUW00156SF01DBean` data-type bean. |
| `データ取得用アカウント番号` (Data Retrieval Account Number) | Item ID | The item ID (`key`) used in the parent bean `FUW00156SFBean` to dispatch to this data-type bean. It identifies the "Data Retrieval Account Number" data-type within the list management framework. |
| `FUW00156SF` | Module | A web-view module in the `eo.web.webview` package handling account-related web screen logic (the `FUW` prefix likely denotes "FUjiwara Web" or a similar internal module namespace; the `01DBean` suffix denotes a data-type definition bean). |
| `FUW00156SFBean` | Bean | The parent business bean that acts as a dispatcher/routing bean. It routes `listKoumokuIds(String key)` calls to the appropriate `*DBean` subclass based on the item key. |
| `ArrayList<String>` | Type | Java's dynamic array collection. Used here to return a modifiable list of field label strings. |
| DBean | Convention | Naming suffix (`*01DBean`) denoting a data-type bean — a metadata-only bean that describes what fields a data record contains, without business logic. |