Memento (design pattern)

E679877

behavioral design pattern software design pattern

Memento (design pattern) is a behavioral software design pattern that captures and externalizes an object's internal state so it can be restored later without violating encapsulation.

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Observed surface forms (3)

Surface form	Occurrences
Caretaker (Memento pattern)	0
Memento object	0
Originator (Memento pattern)	0

Statements (47)

Predicate	Object
instanceOf	behavioral design pattern ⓘ software design pattern ⓘ
alsoKnownAs	Token ⓘ
appliesTo	objects with complex internal state ⓘ systems requiring reversible operations ⓘ
benefit	decouples state storage from state management logic ⓘ simplifies Originator’s interface for saving and restoring state ⓘ
category	Gang of Four behavioral pattern NERFINISHED ⓘ
consequence	can increase memory usage due to stored states ⓘ can increase number of objects created ⓘ
definedIn	Design Patterns: Elements of Reusable Object-Oriented Software NERFINISHED ⓘ
describedBy	Gang of Four NERFINISHED ⓘ
encapsulationLevel	black-box memento ⓘ wide-interface memento ⓘ
ensures	Originator’s internal state is not exposed to other objects ⓘ
field	object-oriented programming ⓘ software engineering ⓘ
hasIntent	capture and externalize an object’s internal state so it can be restored later ⓘ preserve encapsulation while saving and restoring state ⓘ
hasParticipant	Caretaker NERFINISHED ⓘ Memento object ⓘ Originator NERFINISHED ⓘ
introducedIn	1994 ⓘ
involvesRole	Caretaker NERFINISHED ⓘ Memento NERFINISHED ⓘ Originator ⓘ
languageAgnostic	true ⓘ
preserves	encapsulation ⓘ
relatedTo	Command (design pattern) NERFINISHED ⓘ Prototype (design pattern) NERFINISHED ⓘ State (design pattern) NERFINISHED ⓘ
responsibility	create a memento containing a snapshot of its current internal state ⓘ keep track of mementos ⓘ pass mementos back to the Originator for state restoration ⓘ provide state back to the Originator when requested ⓘ request mementos from the Originator ⓘ restore its internal state from a memento ⓘ store the internal state of the Originator ⓘ
roleIn	Memento (design pattern) NERFINISHED ⓘ Memento (design pattern) NERFINISHED ⓘ Memento (design pattern) NERFINISHED ⓘ
supports	rollback of state ⓘ state history management ⓘ undo operations ⓘ
useCase	implement checkpoints in games ⓘ implement multi-level undo in text editors ⓘ implement transactional rollback in applications ⓘ

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Memento → roleInPattern → Memento (design pattern) ⓘ

subject surface form: Originator

Memento → roleInPattern → Memento (design pattern) ⓘ

subject surface form: Caretaker