FieldIndexTopicSelector (Storm 2.7.1 API)

java.lang.Object
- org.apache.storm.kafka.bolt.selector.FieldIndexTopicSelector

All Implemented Interfaces:

Serializable, KafkaTopicSelector
```
public class FieldIndexTopicSelector
extends Object
implements KafkaTopicSelector
```
Uses field with a given index to select the topic name from a tuple .

See Also:

Serialized Form

- Constructor Summary
  
  Constructors
  Constructor Description
  
  FieldIndexTopicSelector(int fieldIndex, String defaultTopicName)
  Creates a new FieldIndexTopicSelector.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  String getTopic(Tuple tuple)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FieldIndexTopicSelector
```
public FieldIndexTopicSelector(int fieldIndex,
                               String defaultTopicName)
```
    Creates a new FieldIndexTopicSelector.
    
    Parameters:
    
    fieldIndex - The index of the field containing the topic name
    
    defaultTopicName - The default topic name if the topic name cannot be read from the tuple
- Method Detail
  - getTopic
```
public String getTopic(Tuple tuple)
```
    Specified by:
    
    getTopic in interface KafkaTopicSelector