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Behavioral/Visitor/index.rst

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+Visitor
+=======
+
+Purpose
+-------
+
+The Visitor Pattern lets you outsource operations on objects to other
+objects. The main reason to do this is to keep a separation of concerns.
+But classes have to define a contract to allow visitors (the
+``Role::accept`` method in the example).
+
+The contract is an abstract class but you can have also a clean
+interface. In that case, each Visitor has to choose itself which method
+to invoke on the visitor.
+
+UML Diagram
+-----------
+
+.. image:: uml/uml.png
+   :alt: Alt Visitor UML Diagram
+   :align: center
+
+Code
+----
+
+You can also find these code on `GitHub`_
+
+Group.php
+
+.. literalinclude:: Group.php
+   :language: php
+   :linenos:
+
+Role.php
+
+.. literalinclude:: Role.php
+   :language: php
+   :linenos:
+
+RolePrintVisitor.php
+
+.. literalinclude:: RolePrintVisitor.php
+   :language: php
+   :linenos:
+
+User.php
+
+.. literalinclude:: User.php
+   :language: php
+   :linenos:
+
+RoleVisitorInterface.php
+
+.. literalinclude:: RoleVisitorInterface.php
+   :language: php
+   :linenos:
+
+Test
+----
+
+Tests/VisitorTest.php
+
+.. literalinclude:: Tests/VisitorTest.php
+   :language: php
+   :linenos:
+
+.. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/master/Behavioral/Visitor