TagHandler (ProtoStream - core 4.5.0.Dev04 API)

```
public interface TagHandler
```
An event based interface for consuming a (read only) Protobuf stream containing exactly one top level message.

Since:

1.0

Author:

[email protected]

Method Summary

All Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`default void`	`onEnd()`	End of top level message.
`default void`	`onEndNested(int fieldNumber, FieldDescriptor fieldDescriptor)`	End of a nested message.
`default void`	`onStart(GenericDescriptor descriptor)`	Start of top level message.
`default void`	`onStartNested(int fieldNumber, FieldDescriptor fieldDescriptor)`	Start of a nested message.
`default void`	`onTag(int fieldNumber, FieldDescriptor fieldDescriptor, Object tagValue)`	A field which is a primitive (non-nested) value.

- Method Detail
  - onStart
```
default void onStart(GenericDescriptor descriptor)
```
    Start of top level message. Do whatever required init here.
    
    Parameters:
    
    descriptor - The GenericDescriptor for the top level Enum or Message. For primitives it is null.
  - onTag
```
default void onTag(int fieldNumber,
                   FieldDescriptor fieldDescriptor,
                   Object tagValue)
```
    A field which is a primitive (non-nested) value.
    
    Parameters:
    
    fieldNumber - the field number
    
    fieldDescriptor - the field descriptor, or null if this is an unknown field.
  - onStartNested
```
default void onStartNested(int fieldNumber,
                           FieldDescriptor fieldDescriptor)
```
    Start of a nested message.
    
    Parameters:
    
    fieldNumber - the field number
    
    fieldDescriptor - a field which is guaranteed to be of type Descriptor, or null if this is an unknown field.
  - onEndNested
```
default void onEndNested(int fieldNumber,
                         FieldDescriptor fieldDescriptor)
```
    End of a nested message.
    
    Parameters:
    
    fieldNumber - the field number
    
    fieldDescriptor - a field which is guaranteed to be of type Descriptor, or null if this is an unknown field.
  - onEnd
```
default void onEnd()
```
    End of top level message. Cleanup your mess!