Prevent nil entity in MLE

[AryaHassanli]

For the violations found on MasterLists we currently set the violation.Entity as nil. This PR, creates an entity representing the cluster or deviceType to be used as violation.Entity.

[gemini-code-assist]

Summary of Changes

Hello @AryaHassanli, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where violation.Entity was set to nil for violations identified within MasterLists. The change ensures that a proper entity, either a matter.Cluster or matter.DeviceType, is created and assigned to the violation.Entity field. This enhancement provides more specific and actionable information for each reported violation, improving the overall quality and utility of the violation data.

Highlights

• Eliminate nil entities: The violation.Entity field will no longer be nil for violations found on MasterLists, providing more complete violation data.
• Contextual entities for violations: Violations are now associated with a specific matter.Cluster or matter.DeviceType entity, created dynamically based on the context of the idColumn.
• Improved violation reporting: By populating the violation.Entity with a concrete object, the reported violations offer richer and more meaningful context for debugging and analysis.

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[gemini-code-assist]

Code Review

This pull request addresses an issue where violations found on MasterLists had a nil entity. The change introduces logic to create a matter.Cluster or matter.DeviceType entity for these violations, which is a good improvement. My review includes a couple of suggestions to enhance the code's robustness and maintainability: one to add a default case to the switch statement that creates entities to handle unexpected column types gracefully, and another to refactor the violation creation logic into a helper function to reduce code duplication. Overall, the changes are in the right direction.

[gemini-code-assist]

To make this function more robust, consider adding a default case to this switch statement. While parseMasterList is currently called only with TableColumnClusterID and TableColumnDeviceID, adding a default case will prevent entity from being implicitly nil if the function is ever used with other idColumn values. This would also help in debugging by logging a warning.

		switch idColumn {
		case matter.TableColumnClusterID:
			entity = &matter.Cluster{
				ID:   id,
				Name: name,
			}
		case matter.TableColumnDeviceID:
			entity = &matter.DeviceType{
				ID:   id,
				Name: name,
			}
		default:
			slog.Warn("unhandled idColumn type in parseMasterList, violation entity will be nil", "idColumn", idColumn.String())
		}

[gemini-code-assist]

There is some repetitive code for creating and adding violations throughout this function. To improve maintainability and reduce duplication, you could extract this logic into a helper function.

For example, you could create a helper like this:

func addMasterListViolation(violations map[string][]spec.Violation, entity types.Entity, row *asciidoc.TableRow, format string, args ...any) {
	v := spec.Violation{
		Entity: entity,
		Type:   spec.ViolationMasterList,
		Text:   fmt.Sprintf(format, args...),
	}
	v.Path, v.Line = row.Origin()
	violations[v.Path] = append(violations[v.Path], v)
}

Then, you can simplify the violation reporting calls, for instance:

if _, taken := reserveds[id.Value()]; taken {
    addMasterListViolation(violations, entity, row, "Duplicate reserved %s in Master List. ID='%s'", idColumn.String(), id.HexString())
    continue
}

This would make the code cleaner and easier to manage.