53 lines
1.4 KiB
PHP
53 lines
1.4 KiB
PHP
<?php
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declare(strict_types=1);
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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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*
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* @see http://en.wikipedia.org/wiki/Cron
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*/
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class FieldFactory implements FieldFactoryInterface
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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 = [];
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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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* @throws InvalidArgumentException if a position is not valid
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*/
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public function getField(int $position): FieldInterface
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{
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return $this->fields[$position] ?? $this->fields[$position] = $this->instantiateField($position);
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}
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private function instantiateField(int $position): FieldInterface
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{
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switch ($position) {
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case CronExpression::MINUTE:
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return new MinutesField();
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case CronExpression::HOUR:
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return new HoursField();
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case CronExpression::DAY:
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return new DayOfMonthField();
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case CronExpression::MONTH:
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return new MonthField();
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case CronExpression::WEEKDAY:
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return new DayOfWeekField();
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}
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throw new InvalidArgumentException(
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($position + 1) . ' is not a valid position'
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);
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}
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}
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