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<?php
namespace Aws\Crypto\Polyfill;
use Aws\Exception\CryptoPolyfillException;
/**
* Trait NeedsTrait
* @package Aws\Crypto\Polyfill
*/
trait NeedsTrait
{
/**
* Preconditions, postconditions, and loop invariants are very
* useful for safe programing. They also document the specifications.
* This function is to help simplify the semantic burden of parsing
* these constructions.
*
* Instead of constructions like
* if (!(GOOD CONDITION)) {
* throw new \Exception('condition not true');
* }
*
* you can write:
* needs(GOOD CONDITION, 'condition not true');
* @param $condition
* @param $errorMessage
* @param null $exceptionClass
*/
public static function needs($condition, $errorMessage, $exceptionClass = null)
{
if (!$condition) {
if (!$exceptionClass) {
$exceptionClass = CryptoPolyfillException::class;
}
throw new $exceptionClass($errorMessage);
}
}
}