Builder__

Purpose

Builder is an interface that build parts of a complex object.

Sometimes, if the builder has a better knowledge of what it builds, this interface could be an abstract class with default methods (aka adapter).

If you have a complex inheritance tree for objects, it is logical to have a complex inheritance tree for builders too.

Note: Builders have often a fluent interface, see the mock builder of PHPUnit for example.

Examples

• PHPUnit: Mock Builder

UML Diagram

.. image:: uml/uml.png :alt: Alt Builder UML Diagram :align: center

Code

You can also find this code on GitHub_

Director.php

.. literalinclude:: Director.php :language: php :linenos:

Builder.php

.. literalinclude:: Builder.php :language: php :linenos:

TruckBuilder.php

.. literalinclude:: TruckBuilder.php :language: php :linenos:

CarBuilder.php

.. literalinclude:: CarBuilder.php :language: php :linenos:

Parts/Vehicle.php

.. literalinclude:: Parts/Vehicle.php :language: php :linenos:

Parts/Truck.php

.. literalinclude:: Parts/Truck.php :language: php :linenos:

Parts/Car.php

.. literalinclude:: Parts/Car.php :language: php :linenos:

Parts/Engine.php

.. literalinclude:: Parts/Engine.php :language: php :linenos:

Parts/Wheel.php

.. literalinclude:: Parts/Wheel.php :language: php :linenos:

Parts/Door.php

.. literalinclude:: Parts/Door.php :language: php :linenos:

Test

Tests/DirectorTest.php

.. literalinclude:: Tests/DirectorTest.php :language: php :linenos:

.. _GitHub: https://github.com/DesignPatternsPHP/DesignPatternsPHP/tree/main/Creational/Builder .. __: http://en.wikipedia.org/wiki/Builder_pattern