Memento Pattern
The Memento Pattern is a behavioral desing pattern in object-oriented programmming that provides a way to capture and externalize an object’s interal state without violating its encapsulation. It allows an object to capture its current state in a memenot object, which can later be used to restore the object to that state. The pattern is particularly useful when you need to implement undo/redo functionality or save and restore an object’s state.
Explanation with Real World Example
Consider a real-world example involving a text editor:
- Originator (Text Editor): The originator is the text editor. It’s the object whose state you want to save and restore. The text editor has a current document with text.
- Memento (Snapshot): The memento represents a snapshot of the text editor’s state. It captures the content of the current document.
- Caretaker (History Manager): The caretaker, in this case, is the history manager. It keeps a stack of mementos (snapshots) taken at various points in the text editor’s history.
In this scenario, the Memento Pattern allows the text editor to save its state by creating a memnto object (snapshot) and pushing it onto the history manager’s stack. Later, if the users wants to undo an action, the history manager can pop the latest memento from the stack and use it to restore the text editor’s state to a previous point in time.
Design Patterns in Object-Oriented Programming (OOP)
Software Development is like putting together a puzzle. Object-oriented programming (OOP) is a popular way to build complex software, but it can be tricky when you face the same design problems repeatedly. That’s where design patterns come in.
Design patterns are like well-known recipes for common problems in software development. They’re not step-by-step instructions, but more like guidelines to help you solve these problems in a flexible and efficient way. These patterns gather the wisdom of the software development community, making it easier for developers to work together and create software that’s easy to maintain, adapt, and reuse.
Important Topics for the Design patterns in object-oriented programming
- Singleton Pattern
- Factory Method Pattern
- Abstract Factory Method Pattern
- Builder Pattern
- Adapter Pattern
- Proxy Pattern
- Decorator Pattern
- Composite Pattern
- Observer Pattern
- Strategy Pattern
- Command Pattern
- State Pattern
- Template Method Pattern
- Visitor Pattern
- Memento Pattern
- Conclusion