ChainOfResponsibility example

Author: hbrawnak

ChainOfResponsibility/index.php

@@ -0,0 +1,77 @@
+<?php
+
+abstract class HomeChecker
+{
+    protected $successor;
+
+    public abstract function check(HomeStatus $home);
+
+    public function successor(HomeChecker $successor)
+    {
+        $this->successor = $successor;
+    }
+
+    public function next(HomeStatus $home)
+    {
+        if ($this->successor) {
+            $this->successor->check($home);
+        }
+    }
+}
+
+class Locks extends HomeChecker
+{
+    public function check(HomeStatus $home)
+    {
+        if (!$home->locked) {
+            echo "The doors are not locked \n";
+        }
+
+        $this->next($home);
+    }
+}
+
+class Lights extends HomeChecker
+{
+
+    public function check(HomeStatus $home)
+    {
+        if (!$home->lightOff) {
+            echo "The lights are still on \n";
+        }
+
+        $this->next($home);
+    }
+}
+
+class Alarm extends HomeChecker
+{
+
+    public function check(HomeStatus $home)
+    {
+        if (!$home->alarmOn) {
+            echo "The alarm has not been set \n";
+        }
+
+        $this->next($home);
+    }
+}
+
+class HomeStatus
+{
+    public $alarmOn = true;
+    public $locked = true;
+    public $lightOff = false;
+}
+
+/*Setup chain ring*/
+$locks  = new Locks();
+$lights = new Lights();
+$alarm  = new Alarm();
+
+/*Hooked together*/
+$locks->successor($lights);
+$lights->successor($alarm);
+
+/*Called first ring of the chain*/
+$locks->check(new HomeStatus());