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Memento

Intent

According to the Gang of Four, the Memento pattern is defined like that: "Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later" (Design Patterns: Elements of Reusable Object-Oriented Software, 2013, p. 283).

When to use it?

Memento pattern should be used to implement undo / redo mechanisms (you save a snapshot of an object's state and you restore or not that state later).

Diagram

Created using PhpStorm and yFiles.

Class diagram of the Memento pattern

Implementation

Order.php

.. literalinclude:: ../../src/Behavioral/Memento/Order.php
    :linenos:
    :language: php

OrderState.php

.. literalinclude:: ../../src/Behavioral/Memento/OrderState.php
    :linenos:
    :language: php

Memento.php

.. literalinclude:: ../../src/Behavioral/Memento/Memento.php
    :linenos:
    :language: php

History.php

.. literalinclude:: ../../src/Behavioral/Memento/History.php
    :linenos:
    :language: php

Tests

MementoTest.php

.. literalinclude:: ../../tests/Behavioral/Memento/MementoTest.php
    :linenos:
    :language: php