strategy pattern

src/GSoares/DesignPatterns/Behavioral/Strategy/README.md

@@ -1 +1,5 @@
-#Strategy - Design Patterns#
+#Strategy - Design Patterns#
+
+Encapsula um algorítimo dentro de uma classe.
+
+Baseado no OCP (Open closed principle).

src/GSoares/DesignPatterns/Behavioral/Strategy/Sample.php

@@ -0,0 +1,99 @@
+<?php
+namespace GSoares\DesignPatterns\Behavioral\Strategy;
+
+class Driver
+{
+    private $mainVehicle;
+
+    public function __construct(Vehicle $mainVehicle)
+    {
+        $this->mainVehicle = $mainVehicle;
+    }
+
+    public function isPilot()
+    {
+        return $this->mainVehicle instanceof Airplane;
+    }
+
+    public function isTaxiDriver()
+    {
+        return $this->mainVehicle instanceof Taxi;
+    }
+
+    public function isBiker()
+    {
+        return $this->mainVehicle instanceof Bike;
+    }
+}
+
+
+interface Vehicle
+{
+    public function run();
+}
+
+class Airplane implements Vehicle
+{
+    public function run()
+    {
+        echo "Running airplane...\n";
+    }
+}
+
+class Bike implements Vehicle
+{
+    public function run()
+    {
+        echo "Running bike...\n";
+    }
+}
+
+class Taxi implements Vehicle
+{
+    public function run()
+    {
+        echo "Running taxi...\n";
+    }
+}
+
+class StrategyContext
+{
+    private $vehicle;
+
+    public function __construct(Driver $driver)
+    {
+        if ($driver->isPilot()) {
+            $this->vehicle = new Airplane();
+
+            return;
+        }
+
+        if ($driver->isTaxiDriver()) {
+            $this->vehicle = new Taxi();
+
+            return;
+        }
+
+        if ($driver->isBiker()) {
+            $this->vehicle = new Bike();
+
+            return;
+        }
+    }
+
+    public function runVehicle()
+    {
+        return $this->vehicle->run();
+    }
+}
+
+function runStrategy()
+{
+    $bikerContext = new StrategyContext(new Driver(new Bike()));
+    $pilotContext = new StrategyContext(new Driver(new Airplane()));
+    $taxiDriverContext = new StrategyContext(new Driver(new Taxi()));
+
+    $bikerContext->runVehicle();
+    $pilotContext->runVehicle();
+    $taxiDriverContext->runVehicle();
+}