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<?php
declare(strict_types=1);
namespace Cron;
use InvalidArgumentException;
/**
* CRON field factory implementing a flyweight factory.
*
* @see http://en.wikipedia.org/wiki/Cron
*/
class FieldFactory implements FieldFactoryInterface
{
/**
* @var array Cache of instantiated fields
*/
private $fields = [];
/**
* Get an instance of a field object for a cron expression position.
*
* @param int $position CRON expression position value to retrieve
*
* @throws InvalidArgumentException if a position is not valid
*/
public function getField(int $position): FieldInterface
{
return $this->fields[$position] ?? $this->fields[$position] = $this->instantiateField($position);
}
private function instantiateField(int $position): FieldInterface
{
switch ($position) {
case CronExpression::MINUTE:
return new MinutesField();
case CronExpression::HOUR:
return new HoursField();
case CronExpression::DAY:
return new DayOfMonthField();
case CronExpression::MONTH:
return new MonthField();
case CronExpression::WEEKDAY:
return new DayOfWeekField();
}
throw new InvalidArgumentException(
($position + 1) . ' is not a valid position'
);
}
}