OneofField (proto-domain-converter 1.3.1 API)

```
@Target(FIELD)
@Retention(SOURCE)
public @interface OneofField
```
Maps a field in a protobuf oneof group to corresponding field/class in the domain objects. This annotation can be place above a class or a class member. The mapping by default is done using the protoField() name in the domainClass(). There are several ways to change the default behavior when this annotation is placed above a field: 1. Standard mapping annotations 2. Using domainField() and optionally converter() properties. This is handy, for example, in cases where the same domain class is used for several fields. 3. Use @ProtoConverter on top of the domain class to convert the proto field to the whole domain class 4. Use converter() property without domainField() to convert the proto field to the whole domain class Used with conjunction of OneofBase

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  java.lang.Class<?> domainClass
  
  java.lang.String protoField
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  java.lang.Class<? extends TypeConverter> converter
  
  java.lang.String domainField

- Element Detail
  - protoField
```
java.lang.String protoField
```
    Returns:
    
    the name of the protobuf field
- - domainClass
```
java.lang.Class<?> domainClass
```
    Returns:
    
    The domain class of this field
- - domainField
```
java.lang.String domainField
```
    Returns:
    
    The name of the domain field (Optional)
    
    Default:
    
    ""
- - converter
```
java.lang.Class<? extends TypeConverter> converter
```
    Returns:
    
    converter if needed. (Optional)
    
    Default:
    
    org.silbertb.proto.domainconverter.custom.NullConverter.class