protected BusinessResult validate(final Entity entity, final Operation operation) {
Assert.notNull(entity, "entity");
Assert.notNull(operation, "operation");
EntityValidator validator = new EntityValidatorImpl(operation);
Collection<ValidationResult> results = validator.validate(entity);
if (results.size() > 0) {
ValidationResult result = results.iterator().next();
return new BusinessResult(true, result.getMessage());
}