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# Business Logic — KKW00810SF01DBean.listKoumokuIds() [9 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.KKW00810SF.KKW00810SF01DBean` |
| Layer | Utility (Data Bean — provides metadata descriptors for the data type bean framework) |
| Module | `KKW00810SF` (Package: `eo.web.webview.KKW00810SF`)

## 1. Role

### KKW00810SF01DBean.listKoumokuIds()

This method is a static factory that returns a metadata descriptor — a fixed ordered list of field names (items) used by the data type bean framework. In the web UI layer, data type beans (DBean) provide schema-like information (column names, types, subkeys) so that generic UI rendering or grid controls can dynamically build forms, tables, and edit screens without hardcoding field metadata.

The method serves as the **item name enumeration** for this particular DBean class, exposing five domain fields: "SSSIT" (a generic item key), "サービス契約番号" (Service Contract Number), "異動区分" (Change Classification), "異動理由コード" (Change Reason Code), and "異動理由メモ" (Change Reason Memo). These fields are all related to **service contract change operations** — specifically tracking how and why a service contract was modified.

This method follows the **metadata descriptor pattern** (also called a schema provider pattern): it returns a simple ordered list of string keys that other parts of the DBean framework (such as `getItemType`, `getSubkey`) use to resolve field metadata by key lookup. The ordering is intentional — it defines the display column order in UI grids or form layouts.

As a `static` method, this is a **shared utility entry point** — any screen or CBS that needs to know what fields this bean exposes can call it without instantiating the DBean. It has no conditional branches, no external calls, and no business logic beyond returning a hardcoded list.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["listKoumokuIds()"])
    STEP1["Create new ArrayList<String> koumokuList"]
    STEP2["Add: SSSIT"]
    STEP3["Add: サービス契約番号
(Service Contract Number)"]
    STEP4["Add: 異動区分
(Change Classification)"]
    STEP5["Add: 異動理由コード
(Change Reason Code)"]
    STEP6["Add: 異動理由メモ
(Change Reason Memo)"]
    END_RETURN["Return koumokuList"]

    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> STEP3
    STEP3 --> STEP4
    STEP4 --> STEP5
    STEP5 --> STEP6
    STEP6 --> END_RETURN
```

This method has a purely linear processing flow — no conditional branches, no loops, no external calls. It creates an `ArrayList`, adds 5 fixed string literals in order, and returns the list.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This is a static method with no parameters. It always returns the same fixed list. |

**Instance fields or external state read:** None. This method is self-contained and does not reference any instance fields, static state, or external services.

## 4. CRUD Operations / Called Services

This method performs no CRUD operations and calls no other services. It is a pure factory method that constructs and returns a local `ArrayList`.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| (none) | — | — | — | No database or service interactions. Pure in-memory list construction. |

## 5. Dependency Trace

No callers found. This method is not referenced anywhere in the codebase by static analysis (searched all Java files for `listKoumokuIds(`). It may be:

- **Dead/unused code**: The method may have been added as part of a DBean contract but never wired into any active screen.
- **Runtime reflection access**: The method name may be discovered at runtime via reflection by the DBean framework (e.g., a base class scans for `listKoumokuIds` using `Class.getMethod()`), which would not show up in static code search.
- **Future placeholder**: It may have been implemented in anticipation of a screen that uses this DBean for displaying service contract change records.

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| (none) | — | — | — |

## 6. Per-Branch Detail Blocks

**Block 1** — [LINEAR SEQUENCE] (L393)

> Create an empty ArrayList and populate it with 5 field name strings in display order.

| # | Type | Code |
|---|------|------|
| 1 | SET | `ArrayList<String> koumokuList = new ArrayList<String>();` // Create local list for item name metadata |
| 2 | EXEC | `koumokuList.add("SSSIT");` // Add generic item key identifier |
| 3 | EXEC | `koumokuList.add("サービス契約番号");` // Add: Service Contract Number — the unique identifier of a service contract |
| 4 | EXEC | `koumokuList.add("異動区分");` // Add: Change Classification — indicates the type of change (e.g., addition, deletion, modification) |
| 5 | EXEC | `koumokuList.add("異動理由コード");` // Add: Change Reason Code — a coded reason for the contract change |
| 6 | EXEC | `koumokuList.add("異動理由メモ");` // Add: Change Reason Memo — free-text notes explaining the change |
| 7 | RETURN | `return koumokuList;` // Return the ordered list of 5 item name keys |

**Block 1.1** — [DATA FIELD MEANINGS] (L395-L399)

> The 5 strings represent business fields for a service contract change record. These are the column headers that will appear in UI grids or forms using this DBean.

| # | Value (Japanese) | English Translation | Business Meaning |
|---|-----------------|---------------------|------------------|
| 1 | SSSIT | SSSIT | Generic item key — a universal identifier used by the DBean framework for internal lookups |
| 2 | サービス契約番号 | Service Contract Number | The unique contract ID that identifies a specific service contract line item |
| 3 | 異動区分 | Change Classification | The type of change applied to the contract (e.g., new, terminate, modify) |
| 4 | 異動理由コード | Change Reason Code | A coded value explaining why the change was made |
| 5 | 異動理由メモ | Change Reason Memo | Free-form text notes providing additional context about the change reason |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `koumoku` | Field (Japanese) | Item — refers to field/column names in the data type bean metadata |
| DBean | Technical term | Data Bean — a metadata descriptor class that provides field names, types, and subkeys to generic UI rendering frameworks |
| SSSIT | Field | Generic item key — a placeholder or universal identifier used by the DBean framework for internal lookups |
| サービス契約番号 | Field | Service Contract Number — the unique identifier for a specific service contract line item in the telecom service catalog |
| 異動区分 | Field | Change Classification — indicates the type of contract modification (e.g., addition/creation, deletion/termination, attribute change) |
| 異動理由コード | Field | Change Reason Code — a standardized coded value that categorizes the reason for a service contract change |
| 異動理由メモ | Field | Change Reason Memo — free-text notes or comments explaining the specific reason for a contract change |
| ArrayList | Technical term | Java `java.util.ArrayList` — a resizable-array implementation of the List interface used to hold the ordered list of field name strings |
| static | Technical term | Java modifier — indicates this is a class-level method callable without instantiating the DBean object |

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