---
title: Business Logic — KKW00846SF01DBean.clearListDataInstance()
source_file: source/koptWebA/src/eo/web/webview/KKA18001SF/KKW00846SF01DBean.java
source_fqn: eo.web.webview.KKA18001SF.KKW00846SF01DBean
source_method: clearListDataInstance
source_lines: 596-605
loc: 10
---

# Business Logic — KKW00846SF01DBean.clearListDataInstance() [10 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.KKA18001SF.KKW00846SF01DBean` |
| Layer | Web/View (Component) — inherited from x33 framework (`X33VViewBaseBean`) |
| Module | `KKA18001SF` (Package: `eo.web.webview.KKA18001SF`) |

## 1. Role

### KKW00846SF01DBean.clearListDataInstance()

This method is a data-bean utility responsible for selectively clearing (emptying) a specific list field within the KKW00846SF screen bean. It operates as part of the x33 framework's view-data bean lifecycle, enabling screens to reset their bound list components to an empty state before repopulating with fresh data. The method implements a simple key-based routing pattern: it evaluates the incoming `key` parameter against a known item identifier ("異動理由コード", i.e., "Reason Code for Movement") and, when matched, clears the corresponding `ido_rsn_cd_list` instance field. This is a **shared utility** invoked by the parent bean (`KKW00846SFBean`) as part of its own `clearListDataInstance` override, which delegates via `super.clearListDataInstance(key)`. The method has no database, entity, or service-layer interactions — it operates purely on in-memory view data structures.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["clearListDataInstance(key)"])
    CHECK_NULL{"key != null?"}
    CHECK_VALUE{"key equals \"異動理由コード\""}
    CLEAR["ido_rsn_cd_list.clear()"]
    END_NODE(["Return / Next"])
    START --> CHECK_NULL
    CHECK_NULL --> |true| CHECK_VALUE
    CHECK_NULL --> |false| END_NODE
    CHECK_VALUE --> |true| CLEAR
    CHECK_VALUE --> |false| END_NODE
    CLEAR --> END_NODE
```

**CRITICAL — Constant Resolution:**

The method compares the `key` parameter directly against the literal string `"異動理由コード"` (Reason Code for Movement). No external constant file is referenced in this method. The literal represents the **configuration item name** for the movement/reason code field (item ID: `ido_rsn_cd`), as documented in the inline comment: 配置項目 "異動理由コード"(String型、項目ID:ido_rsn_cd) → "Configuration item 'Reason Code for Movement' (String type, item ID: ido_rsn_cd)".

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| 1 | `key` | `String` | The configuration item name used to identify which list field should be cleared. It acts as a routing key that determines which internal list is targeted. Currently, only one value is handled: `"異動理由コード"` (Reason Code for Movement), which triggers clearing the `ido_rsn_cd_list`. |

**Instance fields read by this method:**

| Field | Type | Business Description |
|-------|------|---------------------|
| `ido_rsn_cd_list` | `X33VDataTypeList` | The list of reason codes for movements — a view-data list storing multiple reason code entries (each entry is a `X33VDataTypeStringBean` containing a string value). Cleared to empty when the matching key is passed. |

## 4. CRUD Operations / Called Services

This method does not call any service components (SC), business logic (CBS), data access (DAO), or interact with any database entities. It operates purely on in-memory view data structures.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `X33VDataTypeList.clear` | (framework) | (in-memory) | Calls `clear()` on `ido_rsn_cd_list` to empty the list in memory |

The only internal operation is `ido_rsn_cd_list.clear()`, which is a framework method on the `X33VDataTypeList` class that removes all elements from the in-memory list. There are no SC codes, CBS calls, or database operations.

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Component:KKW00846SFBean | `KKW00846SFBean.clearListDataInstance(key)` → `super.clearListDataInstance(key)` → `KKW00846SF01DBean.clearListDataInstance` | `ido_rsn_cd_list.clear() [U] (in-memory list)` |

**Notes:**
- `KKW00846SFBean.java` (line 2554) calls `super.clearListDataInstance(key)`, which delegates to this method in `KKW00846SF01DBean`.
- No screens (KKSV*) or batches (KKBV*) were found directly calling this method. The method is accessed exclusively through the parent bean's override.
- This method is also overridden in multiple FUW (Fujitsu Unified Web) screen beans (e.g., `FUW00901SFBean`, `FUW00912SF01DBean`, etc.), but those are independent classes in separate screen modules that invoke their own parent `super.clearListDataInstance(key)` chains, not this specific bean.

## 6. Per-Branch Detail Blocks

**Block 1** — [IF] `(key != null)` (L598)

> Null-check guard: ensures the key parameter is not null before evaluating it. This prevents `NullPointerException` on the subsequent `.equals()` call.

| # | Type | Code |
|---|------|------|
| 1 | CHECK | `if (key != null)` // Null safety guard |

**Block 1.1** — [IF] `(key.equals("異動理由コード"))` (L601)

> Conditional branch: checks if the key matches the configuration item name for "Reason Code for Movement". The inline comment reads: 配置項目 "異動理由コード"(String型、項目ID:ido_rsn_cd) → "Configuration item 'Reason Code for Movement' (String type, item ID: ido_rsn_cd)".

| # | Type | Code |
|---|------|------|
| 1 | CHECK | `key.equals("異動理由コード")` // "Reason Code for Movement" — configuration item name matching key |
| 2 | EXEC | `ido_rsn_cd_list.clear();` // Empties the in-memory list of reason code entries |

**Block 1.1.1** — [ELSE] (implicit, L602-L603)

> If the key does not match "異動理由コード", no action is taken. The method returns without any side effects.

| # | Type | Code |
|---|------|------|
| 1 | (no-op) | // No action — key does not match any configured item |

**Block 1.2** — [ELSE] (implicit, L599-L600)

> If `key` is null, the method returns immediately without any action. No list is cleared.

| # | Type | Code |
|---|------|------|
| 1 | (no-op) | // key is null — skip all processing, return immediately |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `key` | Parameter | Configuration item name — the identifier used to look up which list field should be cleared in the bean |
| `"異動理由コード"` | Literal | "Reason Code for Movement" — a Japanese configuration item name representing the reason/motive code for service changes or transfers |
| `ido_rsn_cd` | Field | ID for reason code — short form of "異動理由コード" (ido = 異動/movement, rsn = reason, cd = code). Used as the item ID in x33 view data binding |
| `ido_rsn_cd_list` | Field | List of movement reason codes — an `X33VDataTypeList` holding zero or more reason code entries for the current screen session. Each entry is a `X33VDataTypeStringBean` containing a string value |
| `X33VDataTypeList` | Framework type | x33 framework list data type — a typed collection wrapper for view data binding, part of the Fujitsu Futurity x33 web framework |
| `X33VDataTypeStringBean` | Framework type | x33 framework string data bean — a typed wrapper for a single string value within an `X33VDataTypeList` |
| `clear()` | Method | Framework method that removes all elements from an `X33VDataTypeList`, resetting it to an empty collection |
| `KKW00846SF01DBean` | Class | Data bean class for screen KKW00846SF — holds view-level data fields including `ido_rsn_cd_list`, `sysid_update`, `svc_kei_no_value`, etc. Implements `X33VDataTypeBeanInterface` and `X33VListedBeanInterface` |
| `KKW00846SFBean` | Class | Parent/combined bean class that delegates to `KKW00846SF01DBean` via `super.clearListDataInstance(key)` |
| x33 framework | Framework | Fujitsu Futurity x33 — a Java-based web application framework for enterprise screen development, providing view beans, data types, and MVC components |