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Behavioral/Strategy/index.rst

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+Strategy
+========
+
+Terminology:
+------------
+
+-  Context
+-  Strategy
+-  Concrete Strategy
+
+Purpose
+-------
+
+To separate strategies and to enable fast switching between them. Also
+this pattern is a good alternative to inheritance (instead of having an
+abstract class that is extended).
+
+Examples
+--------
+
+-  sorting a list of objects, one strategy by date, the other by id
+-  simplify unit testing: e.g. switching between file and in-memory
+   storage
+
+UML Diagram
+-----------
+
+.. image:: uml/uml.png
+   :alt: Alt Strategy UML Diagram
+   :align: center
+
+Code
+----
+
+You can also find these code on `GitHub`_
+
+DateComparator.php
+
+.. literalinclude:: DateComparator.php
+   :language: php
+   :linenos:
+
+IdComparator.php
+
+.. literalinclude:: IdComparator.php
+   :language: php
+   :linenos:
+
+ObjectCollection.php
+
+.. literalinclude:: ObjectCollection.php
+   :language: php
+   :linenos:
+
+ComparatorInterface.php
+
+.. literalinclude:: ComparatorInterface.php
+   :language: php
+   :linenos:
+
+Test
+----
+
+Tests/StrategyTest.php
+
+.. literalinclude:: Tests/StrategyTest.php
+   :language: php
+   :linenos:
+
+.. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/master/Behavioral/Strategy