<?php
/*
* This file is part of PHPUnit.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace PHPUnit\Framework\Constraint;

use ReflectionClass;
use ReflectionException;

/**
* Constraint that asserts that the object it is evaluated for is an instance
* of a given class.
*
* The expected class name is passed in the constructor.
*/
class IsInstanceOf extends Constraint
{
/**
* @var string
*/
protected $className;

/**
* @param string $className
*/
public function __construct($className)
{
parent::__construct();
$this->className = $className;
}

/**
* Evaluates the constraint for parameter $other. Returns true if the
* constraint is met, false otherwise.
*
* @param mixed $other Value or object to evaluate.
*
* @return bool
*/
protected function matches($other)
{
return ($other instanceof $this->className);
}

/**
* Returns the description of the failure
*
* The beginning of failure messages is "Failed asserting that" in most
* cases. This method should return the second part of that sentence.
*
* @param mixed $other Evaluated value or object.
*
* @return string
*/
protected function failureDescription($other)
{
return \sprintf(
'%s is an instance of %s "%s"',
$this->exporter->shortenedExport($other),
$this->getType(),
$this->className
);
}

/**
* Returns a string representation of the constraint.
*
* @return string
*/
public function toString()
{
return \sprintf(
'is instance of %s "%s"',
$this->getType(),
$this->className
);
}

private function getType()
{
try {
$reflection = new ReflectionClass($this->className);
if ($reflection->isInterface()) {
return 'interface';
}
} catch (ReflectionException $e) {
}

return 'class';
}
}