updated strategy

Patterns/Decorator/Decorators/ReverseDecorator.php

@@ -2,7 +2,8 @@
 
 namespace Patterns\Decorator\Decorators;
 
-use Patterns\Decorator\GreetingInterface;
+use Patterns\Decorator\GreetingInterface,
+    Patterns\Decorator\Greeting;
 
 /**
  * ReverseDecorator
@@ -22,7 +23,7 @@ class ReverseDecorator implements GreetingInterface
      *
      * @param GreetingInterface $greeting the greeting
      *
-     * @return UpperClassDecorator
+     * @return UpperCaseDecorator
      */
     public function __construct(GreetingInterface $greeting)
     {

Patterns/Decorator/Decorators/UpperCaseDecorator.php

@@ -2,7 +2,8 @@
 
 namespace Patterns\Decorator\Decorators;
 
-use Patterns\Decorator\GreetingInterface;
+use Patterns\Decorator\GreetingInterface,
+    Patterns\Decorator\Greeting;
 
 /**
  * UpperClassDecorator

Patterns/Singleton/README.md

@@ -11,4 +11,7 @@ use Patterns\Singleton;
 $obj1 = Singleton\Singleton::getInstance();
 $obj2 = Singleton\Singleton::getInstance();
 assert($obj1 === $obj2);
-```
+```
+
+### PHP Design Patterns
+[Back to all patterns](https://github.com/kevbradwick/php-design-patterns)

Patterns/Strategy/CD.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace Patterns\Strategy;
+
+/**
+ * This CD class implements the strategy pattern. A strategy context must be
+ * set in order to get the string formatted CD.
+ *
+ * @author Kevin Bradwick <kbradwick@gmail.com>
+ */
+class CD
+{
+    /**
+     * @var string
+     */
+    protected $artist;
+
+    /**
+     * @var string
+     */
+    protected $title;
+
+    /**
+     * @var Formats\FormatInterface
+     */
+    protected $strategy;
+
+    /**
+     * Create a new CD object
+     *
+     * @param string $artist
+     * @param string $title
+     */
+    public function __construct($artist, $title)
+    {
+        $this->artist = $artist;
+        $this->title = $title;
+    }
+
+    /**
+     * Set the strategy context
+     *
+     * @param Formats\FormatInterface $context
+     */
+    public function setStrategyContext(Formats\FormatInterface $context)
+    {
+        $this->strategy = $context;
+    }
+
+    /**
+     * Get the cd using the context
+     *
+     * @return string
+     */
+    public function get()
+    {
+        return $this->strategy->get($this);
+    }
+
+    /**
+     * @return string
+     */
+    public function getArtist()
+    {
+        return $this->artist;
+    }
+
+    /**
+     * @return string
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+}

Patterns/Strategy/Formats/FormatInterface.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Patterns\Strategy\Formats;
+
+use Patterns\Strategy\CD;
+
+interface FormatInterface
+{
+    /**
+     * @abstract
+     * @param CD $cd
+     * @return mixed
+     */
+    public function get(CD $cd);
+}

Patterns/Strategy/Formats/Json.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Patterns\Strategy\Formats;
+
+use Patterns\Strategy\CD;
+
+/**
+ * Json Formatter
+ *
+ * @author  Kevin Bradwick <kbradwick@gmail.com>
+ */
+class Json implements FormatInterface
+{
+    /**
+     * @param CD $cd
+     * @return mixed
+     */
+    public function get(CD $cd)
+    {
+        $output['cd'] = array(
+            'artist' => $cd->getArtist(),
+            'title' => $cd->getTitle(),
+        );
+
+        return json_encode($output);
+    }
+}

Patterns/Strategy/Formats/Xml.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Patterns\Strategy\Formats;
+
+use Patterns\Strategy\CD;
+
+/**
+ * XML Formatter
+ *
+ * @author  Kevin Bradwick <kbradwick@gmail.com>
+ */
+class Xml implements FormatInterface
+{
+    /**
+     * @param CD $cd
+     * @return mixed|void
+     */
+    public function get(CD $cd)
+    {
+        $document = new \DOMDocument();
+        $root = $document->createElement('CD');
+        $root = $document->appendChild($root);
+        $title = $document->createElement('TITLE', $cd->getTitle());
+        $root->appendChild($title);
+        $band = $document->createElement('ARTIST', $cd->getArtist());
+        $root->appendChild($band);
+
+        return $document->saveXML();
+    }
+}

Patterns/Strategy/README.md

@@ -0,0 +1,18 @@
+# Strategy
+
+A strategy is useful when traditional inheritance by extending the base class
+is not an option as you want to add sometimes complex logic to the object. You
+can usually tell when a strategy pattern would help if there are a lot of
+if/else conditional statements in your code.
+
+
+```
+use Patterns\Strategy;
+
+$cd = new Strategy\CD('Muse', 'Black Holes');
+$cd->setStrategyContext(new Strategy\Formats\Json());
+echo $cd->get();
+```
+
+### PHP Design Patterns
+[Back to all patterns](https://github.com/kevbradwick/php-design-patterns)

README.md

@@ -8,4 +8,5 @@ These are example design patterns that can be used to solve common problems.
 * [Builder](https://github.com/kevbradwick/php-design-patterns/tree/master/Patterns/Builder)
 * [Decorator](https://github.com/kevbradwick/php-design-patterns/tree/master/Patterns/Decorator)
 * [Delegate](https://github.com/kevbradwick/php-design-patterns/tree/master/Patterns/Delegate)
-* [Singleton](https://github.com/kevbradwick/php-design-patterns/tree/master/Patterns/Singleton)
+* [Singleton](https://github.com/kevbradwick/php-design-patterns/tree/master/Patterns/Singleton)
+* [Strategy](https://github.com/kevbradwick/php-design-patterns/tree/master/Patterns/Strategy)