# (DD01) Business Logic — ChangeMarker.toString() [5 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `com.optage.model.ChangeMarker` |
| Layer | Utility |
| Module | `model` (Package: `com.optage.model`) |

## 1. Role

### ChangeMarker.toString()

`ChangeMarker.toString()` provides a standardized, human-readable snapshot of a change marker instance for logging, debugging, and traceability purposes. It does not modify business state, persist data, or trigger downstream processing; instead, it packages the current values of the marker into a concise formatted string. The method supports operational visibility by exposing the ticket, version, operation type, author, date, and line range in a single record-like representation.

From a system perspective, this method acts as a shared presentation utility for the `ChangeMarker` model. Any component that needs to inspect or emit the object in logs, diagnostic output, or test assertions can rely on this method to produce a consistent format. Because the implementation is a direct `String.format(...)` call with no branching, it behaves as a deterministic formatter rather than a business rule engine or dispatcher.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["toString()"])
    READ_FIELDS(["Read ticketId, version, opType, author, date, lineStart, lineEnd"])
    FORMAT(["String.format('ChangeMarker{ticket=%s, version=%s, op=%s, author=%s, date=%s, lines=%d-%d}', ...)"])
    RETURN(["Return formatted ChangeMarker snapshot"])

    START --> READ_FIELDS
    READ_FIELDS --> FORMAT
    FORMAT --> RETURN
```

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | - |

External state read by this method: instance fields `ticketId`, `version`, `opType`, `author`, `date`, `lineStart`, and `lineEnd`.

## 4. CRUD Operations / Called Services

This method does not invoke any CRUD service, repository, DAO, or SC/CBS method. It only reads in-memory fields and returns a formatted string.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|------------------------|
| - | - | - | - | No persistence access or service call is performed |

## 5. Dependency Trace

Caller discovery found only other `toString()` declarations in the scanned Java sources and one test-site string conversion usage; no direct runtime caller of `ChangeMarker.toString()` was identified from the requested search. As a result, the method should be treated as a leaf utility that is typically invoked implicitly by Java string concatenation, logging frameworks, debugger views, or test assertions rather than by an explicit business service chain.

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Internal utility / logging context | `caller object -> ChangeMarker.toString()` | `formatted snapshot [R] in-memory fields` |

## 6. Per-Branch Detail Blocks

**Block 1** — [RETURN] `(implicit straight-line execution)` (L41-L44)

> This method has no conditional branches, loops, or external service calls. It only formats the current object state into a standardized textual representation.

| # | Type | Code |
|---|------|---|
| 1 | EXEC | `String.format("ChangeMarker{ticket=%s, version=%s, op=%s, author=%s, date=%s, lines=%d-%d}", ticketId, version, opType, author, date, lineStart, lineEnd);` // Build the serialized object summary |
| 2 | RETURN | `return ...;` // Return the formatted change marker snapshot |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `ChangeMarker` | Class | Model object representing metadata about a code or document change record |
| `ticketId` | Field | Change ticket identifier used to trace the origin of the modification |
| `version` | Field | Version or revision label for the tracked change |
| `opType` | Field | Operation type describing the kind of change, such as add, update, or delete |
| `author` | Field | Person or system responsible for the change |
| `date` | Field | Change timestamp or effective date of the change marker |
| `lineStart` | Field | Starting line number covered by the change marker |
| `lineEnd` | Field | Ending line number covered by the change marker |
| `String.format` | Technical term | Java formatting utility used to assemble a structured text message |
| `toString()` | Technical term | Standard Java object representation method used for diagnostics and display |