Revert "My first commit of codes"

This reverts commit a6e5a69348.

vendor/mtdowling/cron-expression/src/Cron/FieldFactory.php

@@ -1,55 +0,0 @@
-<?php
-
-namespace Cron;
-
-/**
- * CRON field factory implementing a flyweight factory
- * @link http://en.wikipedia.org/wiki/Cron
- */
-class FieldFactory
-{
-    /**
-     * @var array Cache of instantiated fields
-     */
-    private $fields = array();
-
-    /**
-     * Get an instance of a field object for a cron expression position
-     *
-     * @param int $position CRON expression position value to retrieve
-     *
-     * @return FieldInterface
-     * @throws InvalidArgumentException if a position is not valid
-     */
-    public function getField($position)
-    {
-        if (!isset($this->fields[$position])) {
-            switch ($position) {
-                case 0:
-                    $this->fields[$position] = new MinutesField();
-                    break;
-                case 1:
-                    $this->fields[$position] = new HoursField();
-                    break;
-                case 2:
-                    $this->fields[$position] = new DayOfMonthField();
-                    break;
-                case 3:
-                    $this->fields[$position] = new MonthField();
-                    break;
-                case 4:
-                    $this->fields[$position] = new DayOfWeekField();
-                    break;
-                case 5:
-                    $this->fields[$position] = new YearField();
-                    break;
-                default:
-                    throw new \InvalidArgumentException(
-                        $position . ' is not a valid position'
-                    );
-            }
-        }
-
-        return $this->fields[$position];
-    }
-}