toMap abstract method

MutableMapping toMap()

Converts the wrapper's state to a structured Map (matches the format defined in this class).

Core logic:

• Serializes the data property (TransportableData) into the "data" field of the Map
• Subclasses may override this method to implement lazy serialization for other properties (e.g., defer encoding large file data until this method is called)

Returns: Serialized Map containing the file metadata and serialized data

Implementation

MutableMapping toMap();