Package weka.experiment
Interface ResultListener
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- 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: 1.7 $
- Author:
- Len Trigg (trigg@cs.waikato.ac.nz)
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description 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.
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Method Detail
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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
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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.
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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
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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 resultskey
- an array of Objects (Strings or Doubles) that uniquely identify a result for a given ResultProducer with given compatibilityStateresult
- 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.
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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 resultskey
- 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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