MqttContentParser (JMRI API)

```
public interface MqttContentParser<T extends NamedBean>
```
Interface defining a content parser, which translates to and from the MQTT payload content.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`beanFromPayload(T bean, java.lang.String payload, java.lang.String topic)`	Load a bean's state from a received MQTT payload.
`java.lang.String`	`payloadFromBean(T bean, int newState)`	Create the payload for a particular state transformation on a particular bean.

- Method Detail
  - beanFromPayload
```
void beanFromPayload(@Nonnull
                     T bean,
                     @Nonnull
                     java.lang.String payload,
                     @Nonnull
                     java.lang.String topic)
```
    Load a bean's state from a received MQTT payload.
    
    Parameters:
    
    bean - The particular item receiving the payload
    
    payload - The entire string received via MQTT
    
    topic - MQTT topic.
    
    Throws:
    
    java.lang.IllegalArgumentException - if the payload is unparsable.
  - payloadFromBean
```
@Nonnull
java.lang.String payloadFromBean(@Nonnull
                                 T bean,
                                 int newState)
```
    Create the payload for a particular state transformation on a particular bean.
    
    Parameters:
    
    bean - The particular item sending the payload
    
    newState - The value to be sent to the layout; this is not yet present in the bean
    
    Returns:
    
    String payload to transfer via MQTT.