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# Business Logic — KKW00810SF01DBean.clearListDataInstance() [10 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.KKW00810SF.KKW00810SF01DBean` |
| Layer | Web Component / View Bean (X33 Framework) |
| Module | `KKW00810SF` (Package: `eo.web.webview.KKW00810SF`) |

## 1. Role

### KKW00810SF01DBean.clearListDataInstance()

This method is a **list data instance clear utility** used within the K-Opticom web client framework. It performs selective cleanup of list-bound UI components by clearing the data contents of a specific list item identified by its display label (key). Specifically, it handles the **mobility reason code** list field (`異動理由コード` / `ido_rsn_cd_list`), which is an `X33VDataTypeList` — the X33 framework's typed list data structure for bound UI components.

The method implements a **key-based dispatch pattern** where a human-readable Japanese label string is matched against known field identifiers to determine which internal data list to clear. This enables generic UI lifecycle management — the same method can be called with different keys to clear different lists, even though only one branch (the mobility reason code) is currently implemented.

Its role in the larger system is as part of the **X33VListedBeanInterface** contract. As a listed bean, `KKW00810SF01DBean` participates in the X33 framework's data binding lifecycle, where this method is invoked to reset or refresh list-bound component state during screen transitions, form resets, or re-initialization cycles. It serves as a **shared utility** within the web view layer, ensuring stale list data does not persist across view operations.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["clearListDataInstance params"])
    NULL_CHECK{key is not null}
    CONTENT_CHECK{key equals mobility reason code}
    CLEAR[ido_rsn_cd_list clear]
    RETURN(["Return / Next"])

    START --> NULL_CHECK
    NULL_CHECK --> true --> CONTENT_CHECK
    NULL_CHECK --> false --> RETURN
    CONTENT_CHECK --> true --> CLEAR
    CONTENT_CHECK --> false --> RETURN
    CLEAR --> RETURN
```

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| 1 | `key` | `String` | The display label of a list item field used to identify which data list to clear. In business terms, it is a human-readable Japanese label that maps to a specific UI-bound list component. Currently supports: `"異動理由コード"` (Mobility Reason Code — the reason code for service contract changes/transfers). If `null`, the method exits without performing any operation (guarded against null-pointer exceptions). |

**Instance fields read by this method:**

| Field | Type | Business Description |
|-------|------|---------------------|
| `ido_rsn_cd_list` | `X33VDataTypeList` | Mobility reason code list — a typed list data structure containing reason codes for service contract mobility/transfer events. Cleared when the matching key is received. |

## 4. CRUD Operations / Called Services

This method performs a direct in-memory list clear operation — no external service component (SC), CBS, or database table is accessed.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| U | `X33VDataTypeList.clear` | - | In-memory list (`ido_rsn_cd_list`) | Clears all elements from the mobility reason code list in memory. No database or SC interaction. |

## 5. Dependency Trace

No callers were found in the codebase for `KKW00810SF01DBean.clearListDataInstance()`. This method is part of the **X33VListedBeanInterface** contract and is invoked by the X33 framework runtime (e.g., during screen lifecycle events such as reset, re-bind, or page transition) rather than by explicit calls from application-level code.

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | X33 Framework Runtime | `X33VListedBeanInterface` lifecycle -> `KKW00810SF01DBean.clearListDataInstance` | `X33VDataTypeList.clear [U] ido_rsn_cd_list (in-memory)` |

## 6. Per-Branch Detail Blocks

**Block 1** — IF `(key != null)` (L544)

> Guard against null input. The method returns immediately if key is null, preventing NullPointerException.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `ido_rsn_cd_list.clear();` // Clear mobility reason code list — Japanese comment: 配列項目 "異動理由コード"(String型、項目ID:ido_rsn_cd) [Translation: Array item "Mobility Reason Code" (String type, item ID: ido_rsn_cd)] |
| 2 | RETURN | `void` // No return value, completes the method |

**Block 1.1** — IF-ELSE-IF `(key.equals("異動理由コード"))` (L546)

> Conditional dispatch: checks if the key matches the mobility reason code field label. If it matches, the associated list is cleared. If not, the method falls through and returns without action. No other branches are implemented; additional list-clearing branches can be added by extending the if-else-if chain.

| # | Type | Code |
|---|------|------|
| 1 | SET | N/A (no assignments) |
| 2 | EXEC | `ido_rsn_cd_list.clear()` // Clears all elements from the mobility reason code list |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `ido_rsn_cd` | Field | Mobility reason code — the reason code for service contract mobility/transfer events (異動理由コード) |
| `ido_rsn_cd_list` | Field | Mobility reason code list — an X33VDataTypeList typed container holding mobility reason code values for UI binding |
| `ido_rsn_memo` | Field | Mobility reason memo — additional notes/memo for mobility/transfer events |
| `ido_div` | Field | Mobility division — classification category for the type of mobility/transfer |
| `svc_kei_no` | Field | Service detail number — internal tracking ID for service contract line items |
| `X33VDataTypeList` | Type | Fujitsu Futurity X33 framework typed list — a generic data structure for binding list data to UI components |
| `X33VListedBeanInterface` | Interface | X33 framework interface for beans that manage list-bound data components, requiring `clearListDataInstance` implementation |
| `X33VViewBaseBean` | Class | Base class for X33 view beans providing common lifecycle and data binding capabilities |
| 異動理由コード | Japanese label | Mobility reason code — display label for the reason why a service contract is being transferred or changed |
| X33 Framework | Technology | Fujitsu Futurity X33 web application framework — enterprise JSF-based MVC framework for K-Opticom's telecom service management systems |
| DBean | Abbreviation | Detail Bean — a data binding bean implementing X33VDataTypeBeanInterface for fine-grained UI component management |

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