/**
* Returns true if object satisfies the specification
* @param $spec
* @return boolean
*/
public function isSatisfiedBy($spec)
{
$lang = new ExpressionLanguage();
// TODO: add caching
$ret = $lang->evaluate($this->generator->generate(), $spec);
if (!is_bool($ret)) {
throw new NotBooleanExpression();
}
return $ret;
}
/**
* Generate the expression language code
* @return string
*/
public function generate()
{
return sprintf('!(%s)', $this->generator->generate());
}
