weka.experiment
Class InstancesResultListener

java.lang.Object
  |
  +--weka.experiment.CSVResultListener
        |
        +--weka.experiment.InstancesResultListener

All Implemented Interfaces:

OptionHandler, ResultListener, java.io.Serializable

public class InstancesResultListener

extends CSVResultListener

InstancesResultListener outputs the received results in arff format to a Writer. All results must be received before the instances can be written out.

Author:

Len Trigg (trigg@cs.waikato.ac.nz)

See Also:

Serialized Form

Field Summary

protected int[]	m_AttributeTypes Stores the attribute types for each column
protected FastVector	m_Instances Stores the instances created so far, before assigning to a header
protected java.util.Hashtable[]	m_NominalIndexes For lookup of indices given a string value for each nominal attribute
protected FastVector[]	m_NominalStrings Contains strings seen so far for each nominal attribute

Fields inherited from class weka.experiment.CSVResultListener

m_Out, m_OutputFile, m_RP

Constructor Summary

InstancesResultListener()

Method Summary

void	acceptResult(ResultProducer rp, java.lang.Object[] key, java.lang.Object[] result) Collects each instance and adjusts the header information.
java.lang.String	globalInfo() Returns a string describing this result listener
void	postProcess(ResultProducer rp) Perform any postprocessing.
void	preProcess(ResultProducer rp) Prepare for the results to be received.

Methods inherited from class weka.experiment.CSVResultListener

determineColumnConstraints, getOptions, getOutputFile, isResultRequired, listOptions, outputFileTipText, setOptions, setOutputFile

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

m_Instances

protected transient FastVector m_Instances

Stores the instances created so far, before assigning to a header

m_AttributeTypes

protected transient int[] m_AttributeTypes

Stores the attribute types for each column

m_NominalIndexes

protected transient java.util.Hashtable[] m_NominalIndexes

For lookup of indices given a string value for each nominal attribute

m_NominalStrings

protected transient FastVector[] m_NominalStrings

Contains strings seen so far for each nominal attribute

Constructor Detail

InstancesResultListener

public InstancesResultListener()

Method Detail

globalInfo

public java.lang.String globalInfo()

Returns a string describing this result listener

Overrides:

globalInfo in class CSVResultListener

Returns:

a description of the result listener suitable for displaying in the explorer/experimenter gui

preProcess

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

Prepare for the results to be received.

Overrides:

preProcess in class CSVResultListener

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.

Overrides:

postProcess in class CSVResultListener

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

Collects each instance and adjusts the header information.

Overrides:

acceptResult in class CSVResultListener

Parameters:

rp - the ResultProducer that generated the result

key - The key for the results.

result - The actual results.

Throws:

java.lang.Exception - if the result could not be accepted.