Filter (Storm 2.7.1 API)

All Superinterfaces:

EachOperation, Operation, Serializable

All Known Implementing Classes:

BaseFilter, Debug, Equals, FilterNull, Negate, TrueFilter, TrueFilter
```
public interface Filter
extends EachOperation
```
Filters take in a tuple as input and decide whether or not to keep that tuple or not.
If the `isKeep()` method of a Filter returns `false` for a tuple, that tuple will be filtered out of the Stream
### Configuration If your `Filter` implementation has configuration requirements, you will typically want to extend BaseFilter and override the Operation.prepare(Map, TridentOperationContext) method to perform your custom initialization.

See Also:

Stream

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  boolean isKeep(TridentTuple tuple)
  Determines if a tuple should be filtered out of a stream.
  - Methods inherited from interface org.apache.storm.trident.operation.Operation
    cleanup, prepare

- Method Detail
  - isKeep
```
boolean isKeep(TridentTuple tuple)
```
    Determines if a tuple should be filtered out of a stream.
    
    Parameters:
    
    tuple - the tuple being evaluated
    
    Returns:
    
    `false` to drop the tuple, `true` to keep the tuple