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Revision Autor Zeilennr. Zeile
148 lars 1 
<?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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}