62 lines
1.5 KiB
PHP
62 lines
1.5 KiB
PHP
<?php
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/*
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* This file is part of the Prophecy.
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* (c) Konstantin Kudryashov <ever.zet@gmail.com>
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* Marcello Duarte <marcello.duarte@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Prophecy\Promise;
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use Prophecy\Exception\InvalidArgumentException;
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use Prophecy\Prophecy\ObjectProphecy;
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use Prophecy\Prophecy\MethodProphecy;
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/**
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* Return argument promise.
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*
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* @author Konstantin Kudryashov <ever.zet@gmail.com>
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*/
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class ReturnArgumentPromise implements PromiseInterface
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{
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/**
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* @var int
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*/
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private $index;
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/**
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* Initializes callback promise.
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*
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* @param int $index The zero-indexed number of the argument to return
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*
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* @throws \Prophecy\Exception\InvalidArgumentException
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*/
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public function __construct($index = 0)
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{
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if (!is_int($index) || $index < 0) {
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throw new InvalidArgumentException(sprintf(
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'Zero-based index expected as argument to ReturnArgumentPromise, but got %s.',
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$index
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));
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}
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$this->index = $index;
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}
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/**
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* Returns nth argument if has one, null otherwise.
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*
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* @param array $args
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* @param ObjectProphecy $object
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* @param MethodProphecy $method
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*
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* @return null|mixed
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*/
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public function execute(array $args, ObjectProphecy $object, MethodProphecy $method)
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{
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return count($args) > $this->index ? $args[$this->index] : null;
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}
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}
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