```
public interface TagExtractor<T>
```
This provides an utility for extracting request/response tags, potentially allocation-free.
Tag should follow the OpenTracing tag names. This might change in the future if a new spec with a superset (semantically wise) of this list.

Author:

Julien Viet

Method Summary

All Methods Static Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`static <T> TagExtractor<T>`	`empty()`
`default Map<String,String>`	`extract(T obj)`	Extract all the tags from `obj` into a `Map<String, String>`.
`default void`	`extractTo(T obj, BiConsumer<String,String> consumer)`	Extract all the tags from `obj` into a tag `consumer`.
`default void`	`extractTo(T obj, Map<String,String> tags)`	Extract all the tags from `obj` into the `tags` map.
`default int`	`len(T obj)`	Returns the number of tags `obj` exposes.
`default String`	`name(T obj, int index)`	Returns the name of the tag extracted from `obj`at the specified `index`.
`default String`	`value(T obj, int index)`	Returns the value of the tag extracted from `obj` at the specified `index`.

- Method Detail
  - empty
```
static <T> TagExtractor<T> empty()
```
  - len
```
default int len(T obj)
```
    Returns the number of tags obj exposes.
    
    Parameters:
    
    obj - the object to evaluate
    
    Returns:
    
    the number of tags
  - name
```
default String name(T obj,
                    int index)
```
    Returns the name of the tag extracted from objat the specified index.
    
    Parameters:
    
    obj - the object to extract the tag name from
    
    index - the index of the tag
    
    Returns:
    
    the tag name
  - value
```
default String value(T obj,
                     int index)
```
    Returns the value of the tag extracted from obj at the specified index.
    
    Parameters:
    
    obj - the object to extract the tag name from
    
    index - the index of the tag
    
    Returns:
    
    the tag value
  - extract
```
default Map<String,String> extract(T obj)
```
    Extract all the tags from obj into a Map<String, String>.
    
    Parameters:
    
    obj - the object to extract the tags from
    
    Returns:
    
    the map of all tags extracted from the object
  - extractTo
```
default void extractTo(T obj,
                       Map<String,String> tags)
```
    Extract all the tags from obj into the tags map.
    
    Parameters:
    
    obj - the object to extract the tags from
    
    tags - the map populated with the tags extracted from the object
  - extractTo
```
default void extractTo(T obj,
                       BiConsumer<String,String> consumer)
```
    Extract all the tags from obj into a tag consumer.
    
    Parameters:
    
    obj - the object to extract the tags from
    
    consumer - the consumer populated with the tags extracted from the object

Interface TagExtractor<T>

Method Summary

Method Detail

empty

len

name

value

extract

extractTo

extractTo