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## weka.experiment
Interface ResultListener

All Superinterfaces:
  java.io.Serializable

All Known Implementing Classes:
  AveragingResultProducer, CSVResultListener, DatabaseResultListener, DatabaseResultProducer, InstancesResultListener, LearningRateResultProducer

    public interface ResultListener

extends java.io.Serializable

Interface for objects able to listen for results obtained by a ResultProducer

Version:
  $Revision: 1.6 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz)

Method Summary
`void` | `acceptResult(ResultProducer rp, java.lang.Object[] key, java.lang.Object[] result)` Accepts results from a ResultProducer.
`java.lang.String[]` | `determineColumnConstraints(ResultProducer rp)` Determines if there are any constraints (imposed by the destination) on additional result columns to be produced by resultProducers.
`boolean` | `isResultRequired(ResultProducer rp, java.lang.Object[] key)` Determines whether the results for a specified key must be generated.
`void` | `postProcess(ResultProducer rp)` Perform any postprocessing.
`void` | `preProcess(ResultProducer rp)` Prepare for the results to be received.

Method Detail

### determineColumnConstraints

    java.lang.String[] determineColumnConstraints(ResultProducer rp)
                                                  throws java.lang.Exception

  Determines if there are any constraints (imposed by the destination) on additional result columns to be produced by resultProducers. Null should be returned if there are NO constraints, otherwise a list of column names should be returned as an array of Strings.

  Parameters:
    `rp` - the ResultProducer to which the constraints will apply
  Returns:
    an array of column names to which resutltProducer's additional results will be restricted.
  Throws:
    `java.lang.Exception` - if an error occurs

### preProcess

    void preProcess(ResultProducer rp)
                    throws java.lang.Exception

  Prepare for the results to be received.

  Parameters:
    `rp` - the ResultProducer that will generate the results
  Throws:
    `java.lang.Exception` - if an error occurs during preprocessing.

### postProcess

    void postProcess(ResultProducer rp)
                     throws java.lang.Exception

  Perform any postprocessing. When this method is called, it indicates that no more results will be sent that need to be grouped together in any way.

  Parameters:
    `rp` - the ResultProducer that generated the results
  Throws:
    `java.lang.Exception` - if an error occurs

### acceptResult

    void acceptResult(ResultProducer rp,
                      java.lang.Object[] key,
                      java.lang.Object[] result)
                      throws java.lang.Exception

  Accepts results from a ResultProducer.

  Parameters:
    `rp` - the ResultProducer that generated the results
    `key` - an array of Objects (Strings or Doubles) that uniquely identify a result for a given ResultProducer with given compatibilityState
    `result` - the results stored in an array. The objects stored in the array may be Strings, Doubles, or null (for the missing value).
  Throws:
    `java.lang.Exception` - if the result could not be accepted.

### isResultRequired

    boolean isResultRequired(ResultProducer rp,
                             java.lang.Object[] key)
                             throws java.lang.Exception

  Determines whether the results for a specified key must be generated.

  Parameters:
    `rp` - the ResultProducer wanting to generate the results
    `key` - an array of Objects (Strings or Doubles) that uniquely identify a result for a given ResultProducer with given compatibilityState
  Returns:
    true if the result should be generated
  Throws:
    `java.lang.Exception` - if it could not be determined if the result is needed.

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