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