---
# Business Logic — FUW00156SF02DBean.clearListDataInstance() [10 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.FUW00156SF.FUW00156SF02DBean` |
| Layer | Web / View Bean (Controller-tier data holder) |
| Module | `FUW00156SF` (Package: `eo.web.webview.FUW00156SF`) |

## 1. Role

### FUW00156SF02DBean.clearListDataInstance()

This method provides **conditional list-element clearing** for a web screen's view bean, acting as a targeted cleanup utility within the survey/response screen flow. It receives a string-based item key and, based on that key, selectively invokes `.clear()` on a specific internal list data structure. The method implements a **lookup-and-clear dispatch pattern**: rather than clearing all lists indiscriminately, it checks the incoming `key` parameter against known item identifiers and only clears the matching list, preserving all other in-memory state. This method serves as a shared utility invoked during page lifecycle events (such as screen transitions, form resets, or row deletions) to prevent stale data from leaking into the next interaction cycle.

The method has a single conditional branch: when the key matches the Japanese string **"アンケート回答リスト"** (meaning "Survey Answer List"), the internal `enquete_answer_list_list` data structure is cleared. If the key is `null` or does not match, the method returns without side effects. This method is inherited by subclasses (e.g., `FUW00912SFBean`, `FUW00926SFBean`, `FUW00959SFBean`) which extend its behavior with additional key-matching branches, forming a polymorphic dispatch chain across multiple survey-type screens.

## 2. Processing Pattern (Detailed Business Logic)

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

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

    CHECK_NULL -->|false| END_NODE(["Return / Next"])

    CHECK_NULL -->|true| CHECK_VALUE["key.equals(\\\"アンケート回答リスト\\\")"]

    CHECK_VALUE -->|false| END_NODE2(["Return / Next"])

    CHECK_VALUE -->|true| CLEAR["enquete_answer_list_list.clear()"]

    CLEAR --> END_NODE3(["Return / Next"])
```

**Processing Steps:**

1. **Entry:** The method is invoked with a `key` parameter representing the business item name to clear.
2. **Null Guard:** Checks if `key` is non-null. If `null`, the method returns immediately without performing any operation. This prevents `NullPointerException` on the subsequent string comparison.
3. **Key Match — アンケート回答リスト (Survey Answer List):** The method compares the `key` against the hardcoded Japanese literal `"アンケート回答リスト"`. This is the sole recognized item identifier. If the comparison matches:
   - **Action:** Invokes `.clear()` on the `enquete_answer_list_list` instance field (an `X33VDataTypeList`), removing all elements from the survey answer list.
4. **Return / Next:** The method returns `void` after either clearing the list or skipping the operation.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| 1 | `key` | `String` | The business item name (項目名) used to identify which data list should be cleared. This key acts as a discriminator that selects the target list for cleanup. |
| 2 | `index` | `int` (instance field) | An index field on the bean, tracked in `FUW00156SF02DBean` (line 67). While not used in this specific method's current implementation, it is available for subclasses that extend this clearing logic. |
| 3 | `enquete_answer_list_list` | `X33VDataTypeList` (instance field) | The internal list data structure that holds survey answer records. Declared at line 64, initialized in the constructor at line 72, and cleared when `key` matches the survey answer list item identifier. |

**Notes on `key` values:**
- `"アンケート回答リスト"` — The only recognized key. Triggers clearing of the survey answer list. Translates to "Survey Answer List."
- Any other non-null value — No action is taken; the method returns silently.
- `null` — The null guard prevents any processing; the method returns immediately.

## 4. CRUD Operations / Called Services

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `X33VDataTypeList.clear` | - | - (in-memory collection) | Calls `clear()` on the `enquete_answer_list_list` instance, removing all elements from the in-memory `X33VDataTypeList`. No database operation — this is a pure in-memory cleanup. |

**Classification rationale:**
- This method performs **no database or service component interaction**. It operates entirely on an in-memory list data structure (`X33VDataTypeList`), which is part of the X33 view framework's data binding layer.
- The `.clear()` call is a Java collection operation, not a persistent CRUD operation. It removes all elements from the list so that stale survey answer data does not persist across screen interactions.
- This method is a view-bean utility — it cleans up transient UI state, not persistent data.

## 5. Dependency Trace

### Caller Analysis

A broad search found **0 direct callers** in the codebase for `.clearListDataInstance(`. This is because `FUW00156SF02DBean` is designed as a **base class** — it is never called directly. Instead, its method is inherited and called via `super` from subclass beans that extend this base.

Multiple subclasses across the `koptWebR` module override this method and invoke `super.clearListDataInstance(key)` to delegate base-class clearing logic before performing subclass-specific operations. Notable callers that delegate to this method include:

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Bean: FUW00912SFBean (Screen survey type) | `FUW00912SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 2 | Bean: FUW00926SFBean (Screen survey type) | `FUW00926SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 3 | Bean: FUW00959SFBean (Screen survey type) | `FUW00959SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 4 | Bean: FUW00964SFBean (Screen survey type) | `FUW00964SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 5 | Bean: FUW00927SFBean (Screen survey type) | `FUW00927SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 6 | Bean: FUW00901SFBean (Screen survey type) | `FUW00901SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 7 | Bean: FUW00919SFBean (Screen survey type) | `FUW00919SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 8 | Bean: FUW00931SFBean (Screen survey type) | `FUW00931SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 9 | Bean: FUW00917SFBean (Screen survey type) | `FUW00917SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 10 | Bean: FUW00907SFBean (Screen survey type) | `FUW00907SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |
| 11 | Bean: FUW00957SFBean (Screen survey type) | `FUW00957SFBean.clearListDataInstance(key)` -> `super.clearListDataInstance(key)` | `enquete_answer_list_list.clear() [no DB]` |

**Called-from (this method calls):**

| # | Called Method | Call Chain (From this Method) | Terminal (SC / CRUD / Entity) |
|---|--------------|-------------------------------|-------------------------------|
| 1 | `X33VDataTypeList.clear()` | `clearListDataInstance` -> `enquete_answer_list_list.clear()` | In-memory list removal [no DB] |

## 6. Per-Branch Detail Blocks

**Block 1** — [IF] `(key != null)` (L711)

> Null guard: if `key` is null, skip all processing to prevent a `NullPointerException` on the string comparison below.

| # | Type | Code |
|---|------|------|
| 1 | SET | `// implicit null check on parameter key` |
| 2 | IF | `if (key != null) { /* proceed to key matching */ }` // Null guard — prevents NPE [-> no constant] |

**Block 1.1** — [IF-THEN] `(key.equals("アンケート回答リスト"))` (L714)

> Checks if the key matches the survey answer list item identifier. The Japanese literal `"アンケート回答リスト"` translates to "Survey Answer List" and identifies the survey response data collection.

| # | Type | Code |
|---|------|------|
| 1 | SET | `// Data type item "Survey Answer List" (item ID: enquete_answer_list)` // Comment: データタイプ項目「アンケート回答リスト」(項目ID:enquete_answer_list) |
| 2 | EXEC | `enquete_answer_list_list.clear();` // Removes all elements from the in-memory survey answer list |

**Block 2** — [ELSE / FALL-THROUGH] (implicit, no else clause)

> If the key does not match `"アンケート回答リスト"`, or if `key` was null, the method simply returns. No additional processing occurs.

| # | Type | Code |
|---|------|------|
| 1 | RETURN | `// Returns void — no operation performed` |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `enquete_answer_list_list` | Field | Survey answer list — an in-memory `X33VDataTypeList` holding response data entries for a survey/questionnaire screen. |
| `enquete_answer_list` | Item ID | Survey Answer List — the internal identifier (項目ID) used to reference the survey answer data type in the X33 framework. |
| `key` | Parameter | Item name (項目名) — a string discriminator used to select which list to clear. |
| `アンケート回答リスト` | Japanese literal | Survey Answer List — the hardcoded key value that triggers clearing of the survey response list. |
| `index` | Field | Index — an integer tracking the position of the current item in a list, used by subclasses for index-aware clearing. |
| X33VDataTypeList | Framework class | A generic typed list from the X33 web framework, used to bind list data to JSF/JavaServer Faces UI components. |
| X33SException | Framework exception | Runtime exception from the X33 framework, thrown when bean data operations fail. |
| X33VViewBaseBean | Framework class | Base bean class in the X33 framework providing common view-layer functionality. |
| X33VListedBeanInterface | Framework interface | Interface for beans that manage list-type data in the X33 view framework. |
| FUW00156SF | Module ID | Survey/Questionnaire screen module — a web screen handling survey answer input and display. |
| DBean | Naming convention | Data Bean — a Java bean that holds view-state data for a specific screen (02D = version/variant 02). |