ValidationAspect.java 文件源码

private void validateMethodParameters(MethodInvocation invocation) throws InvalidArgumentException {
  boolean isInvalid = false;
  InvalidArgumentException ex = new InvalidArgumentException();

  for (int i = 0; i < invocation.getMethod().getParameterCount(); i++) {
    Parameter parameter = invocation.getMethod().getParameters()[i];
    // Only validate arguments which implement ValidatingRequest.
    if (ValidatingRequest.class.isAssignableFrom(parameter.getType())) {
      ValidatingRequest request = (ValidatingRequest) invocation.getArguments()[i];
      if (request == null) {
        // Don't allow null request objects.
        ex.addValidationError(InvalidArgumentException.ErrorMessage.NULL, parameter.getName(), "NULL");
        isInvalid = true;
      } else {
        isInvalid |= validateRequest(request, ex);
      }
    }
  }

  if (isInvalid) {
    // If violations exist abort invoked service call.
    throw ex;
  }
}