# Business Logic — CRW03407SF02DBean.listKoumokuIds() [7 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `eo.web.webview.CRW03407SF.CRW03407SF02DBean` |
| Layer | Utility (Data Bean / DBean — presentation-layer data container) |
| Module | `CRW03407SF` (Package: `eo.web.webview.CRW03407SF`) |

## 1. Role

### CRW03407SF02DBean.listKoumokuIds()

This method serves as a metadata descriptor for data-type bean column headers. It returns a fixed `ArrayList<String>` containing three Japanese strings that correspond to the display labels used in a tab-based UI view: "Tab code" (タブコード), "Tab name" (タブ名称), and "Screen ID" (画面ID). The Javadoc states: _"Returns a list of item names for the data-type bean"_ (データタイプビーンの項目名のリストを返す). This is a shared utility method invoked by the view-layer to dynamically build column headers for tab-display grids. It implements a simple factory pattern — always returning the same immutable list of field identifiers — allowing screens to reconstruct the expected column order without hardcoding labels at each call site. As a `static` method on a DBean (Data Bean), it provides a centralized source of truth for tab-related metadata across the CRW03407SF module.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["listKoumokuIds()"])
    STEP1["Create new ArrayList<String>"]
    STEP2["Add item 01: タブコード (Tab code)"]
    STEP3["Add item 02: タブ名称 (Tab name)"]
    STEP4["Add item 03: 画面ID (Screen ID)"]
    RETURN["Return ArrayList<String>"]
    END(["End"])
    START --> STEP1 --> STEP2 --> STEP3 --> STEP4 --> RETURN --> END
```

**Processing flow:**
1. Instantiate a new `ArrayList<String>`.
2. Add three hardcoded Japanese strings in fixed order: tab code, tab name, and screen ID.
3. Return the populated list.

No conditional branches, no external dependencies, no constant lookups. The method is a linear, deterministic factory.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This is a static method with no parameters. |
| - | Internal list | `ArrayList<String>` | The returned list containing 3 Japanese column header labels used in tab-based view rendering. |

No instance fields or external state are read by this method.

## 4. CRUD Operations / Called Services

This method performs no database or service component operations. It creates and returns an in-memory `ArrayList` entirely.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| — | `ArrayList.<init>()` | N/A | N/A (in-memory) | Allocates a new ArrayList (no persistence). |
| — | `ArrayList.add(String)` | N/A | N/A (in-memory) | Appends a column header label to the list (3 calls). |
| — | `ArrayList<String> return` | N/A | N/A (in-memory) | Returns the populated list to the caller. |

## 5. Dependency Trace

No callers were found for `CRW03407SF02DBean.listKoumokuIds()` across the codebase. A broad search of all Java files in the repository returned 0 matches for any call to this specific method. This suggests the method is either unused, recently added, or replaced by an alternative mechanism.

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| - | None found | N/A | N/A |

## 6. Per-Branch Detail Blocks

The method has no conditional branches or control-flow blocks. The entire method is a single sequential block.

**Block 1** — [SEQUENTIAL] `(no condition)` (L318)

> Creates a new ArrayList and populates it with three hardcoded column header labels.

| # | Type | Code |
|---|------|------|
| 1 | SET | `koumokuList = new ArrayList<String>()` // Create new list for tab metadata [L319] |
| 2 | SET | `koumokuList.add("タブコード")` // Add item 01: Tab code — internal tab identifier [-> L320] |
| 3 | SET | `koumokuList.add("タブ名称")` // Add item 02: Tab name — human-readable tab label [-> L321] |
| 4 | SET | `koumokuList.add("画面ID")` // Add item 03: Screen ID — screen identifier for navigation [-> L322] |
| 5 | RETURN | `return koumokuList;` // Return the populated list [L323] |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `koumoku` | Field | Item / field — refers to column identifiers or metadata keys in a tabular display |
| `koumokuList` | Field | Items list — the ArrayList containing tab-related column header labels |
| タブコード (tabukoodo) | Field | Tab code — the internal identifier for a tab section within a view |
| タブ名称 (tabumeishou) | Field | Tab name — the human-readable label displayed on a tab header |
| 画面ID (gamensai) | Field | Screen ID — the identifier of the associated web screen (e.g., KKSVxxxx), used for navigation context |
| DBean | Acronym | Data Bean — a presentation-layer Java bean that holds metadata or display data for a view/screen |
| data-type bean | Business term | データタイプビーン — a bean class that defines the schema (column names, types) of a tabular data structure used in web views |
| CRW03407SF | Module | Screen module code — the internal module identifier for this web service feature area |