# Business Logic — FUW00943SF02DBean.clearListDataInstance() [10 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.FUW00943SF.FUW00943SF02DBean` |
| Layer | View (Data Bean / DBean — Framework layer `eo.web.webview.*`) |
| Module | `FUW00943SF` (Package: `eo.web.webview.FUW00943SF`) |

## 1. Role

### FUW00943SF02DBean.clearListDataInstance()

This method is a **data lifecycle management** operation within the X33 web framework's view-tier data bean. It clears (empties) the contents of a specific list-type data item held by the bean, identified by a string key. The method serves as a **dispatcher/routing** utility: it receives a textual key representing a business list name, checks whether it matches a known list identifier, and if so, delegates to `List.clear()` to purge all elements from that list in memory. In business terms, it handles **survey answer list** data — specifically, the list (`enquete_answer_list`) that holds the user's answers to an on-screen questionnaire or survey (アンケート = "enquete" / survey, 回答リスト = "answer list"). This method is part of a **shared clearing pattern** used across many screen beans in the X33 framework, where each screen's DataBean overrides this method to manage its own named lists. The method plays the role of a **reset/cleanup** operation invoked during screen transitions, form re-renders, or when the survey response data needs to be discarded (e.g., before repopulating with fresh data). It implements the **template method pattern** at the module level: the parent `FUW00943SFBean` delegates to `super.clearListDataInstance(key)` which may chain through additional subclasses, each adding their own named-list clearing branches.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["clearListDataInstance(String key)"])

    START --> CHECK_NULL["Check: key != null"]

    CHECK_NULL -->|true| CHECK_KEY["Compare key equals \\\"アンケート回答リスト\\\""]
    CHECK_NULL -->|false| END_NODE(["Return / End"])

    CHECK_KEY -->|true| CLEAR_LIST["enquete_answer_list_list.clear()"]
    CHECK_KEY -->|false| END_NODE_2(["Return / End"])

    CLEAR_LIST --> END_NODE_2
```

**CRITICAL — Constant Resolution:**
The condition `key.equals("アンケート回答リスト")` compares against the constant:

| Constant | Value | Business Meaning |
|----------|-------|-----------------|
| `ENQUETE_ANSWER_LIST` | `"アンケート回答リスト"` | Survey Answer List — the list item that holds the user's questionnaire/survey responses |

**Branching summary:**

1. **Null guard** — If `key` is `null`, the method returns immediately without clearing any list.
2. **Key match branch** — If `key` equals `"アンケート回答リスト"` (ENQUETE_ANSWER_LIST), the `enquete_answer_list_list` list is cleared by calling `.clear()` on it.
3. **No-match branch** — If `key` is non-null but does not match the expected value, the method returns without performing any action (no default behavior, no logging).

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| 1 | `key` | `String` | The named identifier of the list to clear. In business terms, this represents the **list item name** (項目名) used to look up which internal list field should be purged. The only recognized value is `"アンケート回答リスト"` (Survey Answer List). If `null`, no operation occurs. If any other non-null value is passed, the method silently returns without action. |

**Instance fields read by this method:**

| Field | Type | Business Description |
|-------|------|---------------------|
| `enquete_answer_list_list` | `X33VDataTypeList` | The survey answer list — a typed list data bean holding the questionnaire response items (each element is an `X33VDataTypeBeanInterface` containing answer data). This is the only list field cleared by this method. |

## 4. CRUD Operations / Called Services

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `enquete_answer_list_list.clear()` | - (In-memory list) | - | Clears all elements from the `enquete_answer_list_list` data structure in memory. No database or service component call is involved. |

**Note:** This method performs **purely in-memory list clearing**. It does not call any SC (Service Component), CBS (Common Business Service), or DAO layer. The `X33VDataTypeList.clear()` operation empties the list object held by the bean without any persistence side effects.

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Screen:FUW00943SF | `FUW00943SFBean.clearListDataInstance(key)` → delegates via `super.clearListDataInstance(key)` → `FUW00943SF02DBean.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [R] (in-memory list)` |

**Caller analysis notes:**
- The primary entry point is `FUW00943SFBean.clearListDataInstance(key)` which overrides this method and delegates via `super.clearListDataInstance(key)`. The bean itself (`FUW00943SFBean`) contains multiple branches for different list items (key_enquete_no_list, enquete_list_list, cust_mlad_list_list, cust_htk_moji_list_list) and calls the parent for the enquete_answer_list branch.
- No other modules or DBean subclasses in the FUW00943SF module reference this specific method directly — it is accessed only through the inheritance chain from `FUW00943SFBean`.
- The X33 framework invokes this method during screen processing (e.g., when form data needs to be reset between view cycles or when re-initializing the bean state).

## 6. Per-Branch Detail Blocks

**Block 1** — [IF] `(key != null)` (L712)

> Null guard: checks whether the key parameter is non-null before attempting any lookup or clearing. If key is null, the method exits immediately.

| # | Type | Code |
|---|------|------|
| 1 | SET | `key` — parameter input (String, business list item name) |
| 2 | IF | `if (key != null)` — null safety check, prevents NullPointerException on subsequent `.equals()` call |

**Block 1.1** — [IF/ELSE-IF] `(key.equals("アンケート回答リスト"))` `[ENQUETE_ANSWER_LIST = "アンケート回答リスト"]` (L715)

> Compares the key against the survey answer list identifier. When it matches, clears the enquete_answer_list_list in memory.

| # | Type | Code |
|---|------|------|
| 1 | IF | `if (key.equals("アンケート回答リスト"))` — `[ENQUETE_ANSWER_LIST = "アンケート回答リスト"]` (Survey Answer List) |
| 2 | EXEC | `enquete_answer_list_list.clear()` — clears all elements from the survey answer list in memory |

> (Implicit else: if the key does not match, no action is taken and execution falls through to method end.)

**Block 1.2** — [IMPLICIT ELSE] (null key path) (L712–L716)

> If `key` is `null`, the entire if-block is skipped. No list is cleared, no exception is thrown. The method simply returns.

| # | Type | Code |
|---|------|------|
| 1 | (skip) | No processing — null key results in no-op |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|-----------------|
| `アンケート回答リスト` | Field (String) | Survey Answer List — the named identifier for the list item holding questionnaire/survey response data |
| `enquete_answer_list_list` | Field | Survey Answer List Data — an `X33VDataTypeList` data bean that stores the collection of survey answer responses submitted by the user |
| `key` | Parameter | List item name — a string used as a lookup key to identify which list data field should be cleared |
| X33 | Acronym | Fujitsu Futurity X33 — the web application framework used to build the screen-layer data beans |
| DBean | Acronym | Data Bean — a view-tier bean that holds screen-specific data fields and their state, part of the X33 MVC pattern |
| ENQUETE | Acronym | Survey / Questionnaire — from Japanese アンケート (enketo), referring to user surveys or questionnaires presented on-screen |
| X33VDataTypeList | Class | A typed list data structure in the X33 framework that holds elements as `X33VDataTypeBeanInterface` objects, providing list operations like `clear()`, `size()`, and `get()` |
| X33VDataTypeBeanInterface | Interface | The interface implemented by individual data elements within an X33VDataTypeList, providing model data loading capabilities |
| FUW00943SF | Module | Screen module identifier — a web screen module responsible for survey/enquete (questionnaire) functionality |

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*Document generated from source analysis. Lines 707–716 of `FUW00943SF02DBean.java` (10 LOC).*