从Symfony自定义验证器抛出全局错误的优雅方法？

I'm using Symfony 1.4 to allow users to import various types of CSV files, and I've decided to consolidate validation and sanitizing of the actual contents of uploaded files into a custom validator - The custom validator would extend sfValidatorFile.

Also, when a file contains errors, I'd like to throw global errors on forms, rather than displaying them as field/local errors - and - have the ability to show many validation errors at the same time for a given import file.

I'm pretty sure I can make this work by using a Post Validator, but this doesn't seem like a great fit for a Post Validator (since I really only need knowledge of one form field in order to perform my custom validation), but more importantly, I'd like something a bit more elegant that packages all of the extra validation work into a single custom file validator.

For example, instead of:

$this->validatorSchema['file'] = new sfValidatorFile( … );
$this->validatorSchema->setPostValidator(new myFancyValidator( … ));

I'd just like to do something like:

$this->validatorSchema['file'] = new myFancyValidator( … );

...and have validation errors encountered inside myFancyValidator added to the form's collection of global errors.

I've tried a few different approaches to push errors onto the form's globalErrors from within my custom validator, but I'm missing something regarding how the various pieces of the validation puzzle fit/scope together. Any thoughts as to how to accomplish this? Dependency injection?

Throw a sfValidatorError object in your custom validator, e.g. :

if(!$isValid){
    // throw global error
    throw new sfValidatorError($this, "invalid");
}
else {
    return true;
}