Examples with Payload org.springframework.messaging.handler.annotation.Payload used on opensource projects

Example 1 with Payload

use of org.springframework.messaging.handler.annotation.Payload in project spring-framework by spring-projects.

the class PayloadArgumentResolver method resolveArgument.

@Override
public Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception {
    Payload ann = parameter.getParameterAnnotation(Payload.class);
    if (ann != null && StringUtils.hasText(ann.expression())) {
        throw new IllegalStateException("@Payload SpEL expressions not supported by this resolver");
    }
    Object payload = message.getPayload();
    if (isEmptyPayload(payload)) {
        if (ann == null || ann.required()) {
            String paramName = getParameterName(parameter);
            BindingResult bindingResult = new BeanPropertyBindingResult(payload, paramName);
            bindingResult.addError(new ObjectError(paramName, "Payload value must not be empty"));
            throw new MethodArgumentNotValidException(message, parameter, bindingResult);
        } else {
            return null;
        }
    }
    Class<?> targetClass = parameter.getParameterType();
    Class<?> payloadClass = payload.getClass();
    if (ClassUtils.isAssignable(targetClass, payloadClass)) {
        validate(message, parameter, payload);
        return payload;
    } else {
        if (this.converter instanceof SmartMessageConverter) {
            SmartMessageConverter smartConverter = (SmartMessageConverter) this.converter;
            payload = smartConverter.fromMessage(message, targetClass, parameter);
        } else {
            payload = this.converter.fromMessage(message, targetClass);
        }
        if (payload == null) {
            throw new MessageConversionException(message, "Cannot convert from [" + payloadClass.getName() + "] to [" + targetClass.getName() + "] for " + message);
        }
        validate(message, parameter, payload);
        return payload;
    }
}