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