# Business Logic — KKW00401SF01DBean.listKoumokuIds() [10 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.KKW00401SF.KKW00401SF01DBean` |
| Layer | Utility / Data Bean (Web layer — provides metadata for UI screen rendering) |
| Module | `KKW00401SF` (Package: `eo.web.webview.KKW00401SF`) |

## 1. Role

### KKW00401SF01DBean.listKoumokuIds()

This method provides the ordered list of display item names (fields) for the Code Type data type bean in the KKW00401SF screen module. It returns a static, pre-built list of six field labels that define what columns/attributes the system should present when rendering Code Type information on the UI — including the code type code, code type name, selected index, initial setting code, code type code value list, and code type name list. This is a shared utility method called by the screen's view or controller logic to drive table headers, form field ordering, or dynamic column generation. As a pure data provider with no conditional branches or external calls, its role is to serve as a single source of truth for the metadata shape of the Code Type data type bean, ensuring consistent field ordering across all screens that consume it. The method implements the **Data Provider** pattern, acting as a metadata registry rather than performing any business computation.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["listKoumokuIds()"])
    STEP1["Create new ArrayList<String> koumokuList"]
    STEP2["Add Code Type Code"]
    STEP3["Add Code Type Name"]
    STEP4["Add Selected Index"]
    STEP5["Add Initial Setting Code"]
    STEP6["Add Code Type Code Value List"]
    STEP7["Add Code Type Name List"]
    RETURN["Return koumokuList"]
    END(["End"])

    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> STEP3
    STEP3 --> STEP4
    STEP4 --> STEP5
    STEP5 --> STEP6
    STEP6 --> STEP7
    STEP7 --> RETURN
    RETURN --> END
```

This method follows a linear, sequential processing pattern: it creates a new `ArrayList<String>`, appends six hardcoded Japanese display label strings in a fixed order, and returns the populated list. There are no conditional branches, loops (beyond the implicit sequential `add` calls), or external service calls.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This method takes no parameters. It is a static factory that returns a fixed, pre-defined list of field labels. |

No instance fields or external state is read by this method. It is entirely self-contained and deterministic.

## 4. CRUD Operations / Called Services

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | (none) | - | - | This method performs no CRUD operations. It creates and populates an in-memory list without accessing any database, service component, or external system. |

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| - | (none found) | - | - |

No callers of this method were found in the codebase. It may be referenced dynamically via reflection, invoked from configuration-driven code not visible in static analysis, or called from compiled JARs not present in the source tree. The method exists as a static utility accessible to any code in the `KKW00401SF` module that needs to know the Code Type data bean's field metadata.

## 6. Per-Branch Detail Blocks

**Block 1** — [SET] `(local variable creation)` (L517)

> Creates an empty `ArrayList<String>` to hold the item name strings.

| # | Type | Code |
|---|------|------|
| 1 | SET | `ArrayList<String> koumokuList = new ArrayList<String>();` // Initialize empty list to hold field name labels |

**Block 2** — [EXEC] `(sequential add calls — items in fixed order)` (L518–L523)

> Appends six Japanese display label strings in a predetermined sequence. These labels define what columns the UI should render for Code Type data.

| # | Type | Code |
|---|------|------|
| 1 | SET | `koumokuList.add("コードタイプコード");` // Add "Code Type Code" — the unique identifier for a code type [-> KoumokuId[0]] |
| 2 | SET | `koumokuList.add("コードタイプ名称");` // Add "Code Type Name" — the human-readable name of the code type [-> KoumokuId[1]] |
| 3 | SET | `koumokuList.add("選択インデックス");` // Add "Selected Index" — the index position of the currently selected item [-> KoumokuId[2]] |
| 4 | SET | `koumokuList.add("初期設定コード");` // Add "Initial Setting Code" — the default value code [-> KoumokuId[3]] |
| 5 | SET | `koumokuList.add("コードタイプコード値リスト");` // Add "Code Type Code Value List" — the list of possible code values [-> KoumokuId[4]] |
| 6 | SET | `koumokuList.add("コードタイプ名称リスト");` // Add "Code Type Name List" — the list of human-readable names for code values [-> KoumokuId[5]] |

**Block 3** — [RETURN] `(return the populated list)` (L524)

> Returns the complete list of item name labels to the caller.

| # | Type | Code |
|---|------|------|
| 1 | RETURN | `return koumokuList;` // Return the list of 6 field name strings to caller |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `koumoku` (項目) | Field Name | Item / field — refers to displayable fields or columns in a data table or form |
| Code Type (コードタイプ) | Business term | A classification type that groups related codes with names and values — used for dropdown options, lookup tables, and standardized values in the system |
| Code Type Code (コードタイプコード) | Field | The unique identifier code for a code type entry |
| Code Type Name (コードタイプ名称) | Field | The human-readable display name of a code type |
| Selected Index (選択インデックス) | Field | The zero-based index of the currently selected item in a list or dropdown |
| Initial Setting Code (初期設定コード) | Field | The default value code used when no explicit selection is made |
| Code Type Code Value List (コードタイプコード値リスト) | Field | The ordered list of all possible code values for a given code type |
| Code Type Name List (コードタイプ名称リスト) | Field | The ordered list of human-readable names corresponding to the code values |