# Business Logic — KKW01027SF02DBean.clearListDataInstance() [14 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.KKA15001SF.KKW01027SF02DBean` |
| Layer | Web UI Data Bean (View Layer / X33 Framework ListedBean) |
| Module | `KKA15001SF` (Package: `eo.web.webview.KKA15001SF`) |

## 1. Role

### KKW01027SF02DBean.clearListDataInstance()

This method serves as a **list data reset utility** within the K-Opticom web application's UI data bean. It clears (empties) one of two `X33VDataTypeList` collections that store code list values displayed on the KKA15001SF screen — specifically, the "Code List" dropdown (`cd_div_list_list`) or the "Code Name List" dropdown (`cd_div_nm_list_list`). The method is parameterized by a Japanese string key that identifies which list should be cleared, implementing a **routing/dispatch pattern** where the key value determines the target collection. As a shared utility method defined on a `X33VListedBeanInterface` implementation, this method can be overridden and delegated via `super.clearListDataInstance(key)` by subclasses in other screen modules (e.g., `FUW00912SF`, `FUW00926SF`), making it part of a reusable UI lifecycle contract within the X33 framework. Its role in the larger system is as a **data lifecycle management method** — invoked when the screen needs to reset filter values or reinitialize dropdown selections (for example, after a search condition change or a parent code selection that should clear dependent child dropdowns).

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["clearListDataInstance(key)"])
    COND_NULL{"key is null?"}
    COND_CODE{"Code list key?"}
    COND_CD_NM{"Code name list key?"}
    CLEAR_CODE["cd_div_list_list.clear()"]
    CLEAR_CD_NM["cd_div_nm_list_list.clear()"]
    END_NODE(["Return"])

    START --> COND_NULL
    COND_NULL -->|true| COND_CODE
    COND_NULL -->|false| END_NODE
    COND_CODE -->|true| CLEAR_CODE
    COND_CODE -->|false| COND_CD_NM
    COND_CD_NM -->|true| CLEAR_CD_NM
    COND_CD_NM -->|false| END_NODE
    CLEAR_CODE --> END_NODE
    CLEAR_CD_NM --> END_NODE
```

**Processing steps:**
1. **Null guard** — Checks if the `key` parameter is `null`. If `null`, the method returns immediately without any operation.
2. **Code list dispatch** — If `key` equals the Japanese string `"コードリスト"` (meaning "Code List"), it clears the `cd_div_list_list` collection.
3. **Code name list dispatch** — If `key` equals the Japanese string `"コード名リスト"` (meaning "Code Name List"), it clears the `cd_div_nm_list_list` collection.
4. **No match** — If `key` does not match either known value, the method returns without modifying any state.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| 1 | `key` | `String` | The list identifier that determines which `X33VDataTypeList` collection to clear. Valid values are `"コードリスト"` (Code List — used for code-type selection dropdowns) or `"コード名リスト"` (Code Name List — used for descriptive code name dropdowns). If `null` or an unrecognized value, the method performs no action. |

**Instance fields read:**
| Field | Type | Business Description |
|-------|------|---------------------|
| `cd_div_list_list` | `X33VDataTypeList` | Code list data collection — stores selectable code values (e.g., service category codes) displayed in dropdown UI components |
| `cd_div_nm_list_list` | `X33VDataTypeList` | Code name list data collection — stores descriptive code name values corresponding to the code list, displayed alongside or in dependent dropdowns |

## 4. CRUD Operations / Called Services

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `X33VDataTypeList.clear` | - | - | Calls `clear()` on `cd_div_list_list` to remove all items from the code list data collection |
| - | `X33VDataTypeList.clear` | - | - | Calls `clear()` on `cd_div_nm_list_list` to remove all items from the code name list data collection |

**Notes:**
- This method performs **in-memory data manipulation only**. No SC (Service Component) or CBS (Common Business Service) calls are made.
- No database read, create, update, or delete operations occur.
- The `clear()` operation is a collection-level clearing (removes all elements) that resets UI-bound dropdown data.

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | - | (No direct callers found in koptWebA — invoked via X33 framework lifecycle or subclass delegation) | - |

**Notes:**
- No direct callers to `KKW01027SF02DBean.clearListDataInstance()` were found in the `koptWebA` application codebase.
- This method is defined on a `X33VListedBeanInterface` implementation, suggesting it is called by the X33 framework's bean lifecycle (e.g., during screen initialization, action processing, or validation phases).
- Similar `clearListDataInstance` methods in other modules (e.g., `FUW00912SFBean`, `FUW00926SFBean`, `FUW00964SFBean`) call `super.clearListDataInstance(key)` to delegate to this parent implementation, indicating the pattern is inherited across the X33 listed bean hierarchy.
- As a data bean utility method, it does not have a screen entry point or batch caller — it is invoked programmatically by the framework or by subclass overrides.

## 6. Per-Branch Detail Blocks

**Block 1** — [IF] `(key != null)` (L504)

> Null guard — ensures the key parameter is not null before attempting any comparison or list clearing.

| # | Type | Code |
|---|------|------|
| 1 | COND | `key != null` |
| 2 | CALL | `cd_div_list_list.clear()` — when key matches "コードリスト" (Code List) [L507-L508] |
| 3 | CALL | `cd_div_nm_list_list.clear()` — when key matches "コード名リスト" (Code Name List) [L510-L511] |

**Block 1.1** — [IF-ELSE-IF] `(key.equals("コードリスト")) [L506]`

> Branch: Key matches the Japanese string for "Code List" — clears the primary code dropdown data.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `cd_div_list_list.clear()` // Clears all elements from the code list data list |

**Block 1.2** — [ELSE-IF] `(key.equals("コード名リスト")) [L509]`

> Branch: Key matches the Japanese string for "Code Name List" — clears the code name dropdown data.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `cd_div_nm_list_list.clear()` // Clears all elements from the code name list data list |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `cd_div_list_list` | Field | Code list data list — an `X33VDataTypeList` containing selectable code values (e.g., service type codes) for UI dropdown components |
| `cd_div_nm_list_list` | Field | Code name list data list — an `X33VDataTypeList` containing descriptive text labels corresponding to code list values |
| コードリスト | Japanese | Code List — the Japanese string key used to identify the primary code list collection (the "code" column in a code-name pair) |
| コード名リスト | Japanese | Code Name List — the Japanese string key used to identify the description list collection (the "name" column in a code-name pair) |
| X33VDataTypeList | Technical | X33 Framework data type list — a typed list collection used by the Fujitsu X33 web framework for binding UI form data and dropdown selections |
| X33VListedBeanInterface | Technical | X33 Framework interface for bean classes that manage list-type (repeating/row) data in web form views |
| KKA15001SF | Module | Service Screen — the K-Opticom screen module number, part of the K-Opticom web application platform handling service-related operations |
| DBean | Technical | Data Bean — an X33 framework data transfer object that holds form input data, validated data, and display data between the view (JSP) and logic layers |
| X33SException | Technical | X33 Framework runtime exception — thrown by methods in the X33 framework when a runtime error occurs during data binding or processing |