stop using reflection in prooduction code

Problem: Reflection is a debugging tool and not really meant for use on production. There are easier ways to check if a class implements an interface with `is_a()`.

Solution: Get rid of reflection use and switch to `is_a()` in TaskManager, refactor the Enum thing that does not make sense since it is not being used.

The `is_a()` solution is really straightforward and has been supported in php for ages.

The Enum thing was a copy paste hack from stackoverflow and ignored the simple solution mentioned there while not using the features of the advanced one.

airtime_mvc/application/common/TaskManager.php

@@ -350,8 +350,7 @@ class TaskFactory {
      * @return bool true if the class $c implements AirtimeTask
      */
     private static function _isTask($c) {
-        $reflect = new ReflectionClass($c);
-        return $reflect->implementsInterface('AirtimeTask');
+        return is_a('AirtimeTask', $c, true);
     }
 
     /**

airtime_mvc/application/common/enum/Enum.php

@@ -1,47 +0,0 @@
-<?php
-
-/**
- * Basic enumeration implementation; from http://stackoverflow.com/questions/254514/php-and-enumerations
- *
- * Class Enum
- */
-abstract class Enum {
-
-    const __default = NULL;
-    private static $constCacheArray = NULL;
-
-    private function __construct() {}
-
-    private static function getConstants() {
-        if (self::$constCacheArray == NULL) {
-            self::$constCacheArray = [];
-        }
-        $calledClass = get_called_class();
-        if (!array_key_exists($calledClass, self::$constCacheArray)) {
-            $reflect = new ReflectionClass($calledClass);
-            self::$constCacheArray[$calledClass] = $reflect->getConstants();
-        }
-        return self::$constCacheArray[$calledClass];
-    }
-
-    public static function isValidName($name, $strict = false) {
-        $constants = self::getConstants();
-
-        if ($strict) {
-            return array_key_exists($name, $constants);
-        }
-
-        $keys = array_map('strtolower', array_keys($constants));
-        return in_array(strtolower($name), $keys);
-    }
-
-    public static function isValidValue($value) {
-        $values = array_values(self::getConstants());
-        return in_array($value, $values, $strict = true);
-    }
-
-    public static function getDefault() {
-        return static::__default;
-    }
-
-}

airtime_mvc/application/common/enum/HttpRequestType.php

@@ -1,6 +1,6 @@
 <?php
 
-final class HttpRequestType extends Enum {
+final class HttpRequestType {
 
     const GET = "GET";
     const POST = "POST";

airtime_mvc/application/common/enum/MediaType.php

@@ -1,7 +1,6 @@
 <?php
 
-require_once "Enum.php";
-final class MediaType extends Enum {
+final class MediaType {
 
     const __default = self::FILE;
 
@@ -11,4 +10,8 @@ final class MediaType extends Enum {
     const WEBSTREAM = 4;
     const PODCAST = 5;
 
+    public static function getDefault() {
+        return static::__default;
+    }
+
 }