layout, title, folder, permalink, categories, tags
| layout | title | folder | permalink | categories | tags | |||
|---|---|---|---|---|---|---|---|---|
| pattern | Memento | memento | /patterns/memento/ | Behavioral |
|
Also known as
Token
Intent
Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.
Applicability
Use the Memento pattern when
- a snapshot of an object's state must be saved so that it can be restored to that state later, and
- a direct interface to obtaining the state would expose implementation details and break the object's encapsulation