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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); } } }
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