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Interface weka.experiment.ResultListener
- public interface ResultListener
- extends java.io.Serializable
Interface for objects able to listen for results obtained
by a ResultProducer
- Version:
- $Revision: 1.5 $
- Author:
- Len Trigg (trigg@cs.waikato.ac.nz)
acceptResult(ResultProducer, Object[], Object[])
- Accepts results from a ResultProducer.
determineColumnConstraints(ResultProducer)
- Determines if there are any constraints (imposed by the
destination) on additional result columns to be produced by
resultProducers.
isResultRequired(ResultProducer, Object[])
- Determines whether the results for a specified key must be
generated.
postProcess(ResultProducer)
- Perform any postprocessing.
preProcess(ResultProducer)
- Prepare for the results to be received.
determineColumnConstraints
public 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
public 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
public 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
public 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
public 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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