Validate.php

<?php

use Symfony\Component\Validator\Constraint;

/**
 * @Annotation
 * @author Oliver Hoff <oliver@hofff.com>
 */
class Validate extends Constraint {

	/**
	 * @var array<string, string|array<string>>
	 */
	public $map;

	/**
	 * @param string $options
	 */
	public function __construct($options = null) {
		parent::__construct($options);
		is_array($this->map) || $this->map = array();
		if($this->map) {
			isset($this->groups) || $this->groups = array();
			$this->groups = array_unique(array_merge($this->groups, array_keys($this->map)));
		}
	}

	/**
	 * @see \Symfony\Component\Validator\Constraint::getDefaultOption()
	 */
	public function getDefaultOption() {
		return 'map';
	}

}

ValidateValidator.php

<?php

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Context\ExecutionContextInterface;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

/**
 * @author Oliver Hoff <oliver@hofff.com>
 */
class ValidateValidator extends ConstraintValidator {

	/**
	 * @see \Symfony\Component\Validator\ConstraintValidatorInterface::validate()
	 */
	public function validate($value, Constraint $constraint) {
		if(!$constraint instanceof Validate) {
			throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Validate');
		}

		if(null === $value) {
			return;
		}

		/* @var $context ExecutionContextInterface */
		$context = $this->context;

		$validationGroup = $context->getGroup();
		$groups = isset($constraint->map[$validationGroup])
			? $constraint->map[$validationGroup]
			: null;

		$context->getValidator()
			->inContext($context)
			->validate($value, null, $groups);
	}

}