weka.experiment
Class CSVResultListener

java.lang.Object
  extended by weka.experiment.CSVResultListener
All Implemented Interfaces:
java.io.Serializable, OptionHandler, ResultListener
Direct Known Subclasses:
InstancesResultListener

public class CSVResultListener
extends java.lang.Object
implements ResultListener, OptionHandler

Takes results from a result producer and assembles them into comma separated value form.

Valid options are:

 -O <file name>
  The filename where output will be stored. Use - for stdout.
  (default temp file)

Version:
$Revision: 1.12 $
Author:
Len Trigg (trigg@cs.waikato.ac.nz)
See Also:
Serialized Form

Constructor Summary
CSVResultListener()
          Sets temporary file.
 
Method Summary
 void acceptResult(ResultProducer rp, java.lang.Object[] key, java.lang.Object[] result)
          Just prints out each result as it is received.
 java.lang.String[] determineColumnConstraints(ResultProducer rp)
          Determines if there are any constraints (imposed by the destination) on the result columns to be produced by resultProducers.
 java.lang.String[] getOptions()
          Gets the current settings of the Classifier.
 java.io.File getOutputFile()
          Get the value of OutputFile.
 java.lang.String globalInfo()
          Returns a string describing this result listener
 boolean isResultRequired(ResultProducer rp, java.lang.Object[] key)
          Always says a result is required.
 java.util.Enumeration listOptions()
          Returns an enumeration describing the available options..
 java.lang.String outputFileName()
          Get the value of OutputFileName.
 java.lang.String outputFileTipText()
          Returns the tip text for this property
 void postProcess(ResultProducer rp)
          Perform any postprocessing.
 void preProcess(ResultProducer rp)
          Prepare for the results to be received.
 void setOptions(java.lang.String[] options)
          Parses a given list of options.
 void setOutputFile(java.io.File newOutputFile)
          Set the value of OutputFile.
 void setOutputFileName(java.lang.String name)
          Set the value of OutputFileName.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CSVResultListener

public CSVResultListener()
Sets temporary file.

Method Detail

globalInfo

public java.lang.String globalInfo()
Returns a string describing this result listener

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

listOptions

public java.util.Enumeration listOptions()
Returns an enumeration describing the available options..

Specified by:
listOptions in interface OptionHandler
Returns:
an enumeration of all the available options.

setOptions

public void setOptions(java.lang.String[] options)
                throws java.lang.Exception
Parses a given list of options.

Valid options are:

 -O <file name>
  The filename where output will be stored. Use - for stdout.
  (default temp file)

Specified by:
setOptions in interface OptionHandler
Parameters:
options - the list of options as an array of strings
Throws:
java.lang.Exception - if an option is not supported

getOptions

public java.lang.String[] getOptions()
Gets the current settings of the Classifier.

Specified by:
getOptions in interface OptionHandler
Returns:
an array of strings suitable for passing to setOptions

outputFileTipText

public java.lang.String outputFileTipText()
Returns the tip text for this property

Returns:
tip text for this property suitable for displaying in the explorer/experimenter gui

getOutputFile

public java.io.File getOutputFile()
Get the value of OutputFile.

Returns:
Value of OutputFile.

setOutputFile

public void setOutputFile(java.io.File newOutputFile)
Set the value of OutputFile. Also sets the OutputFileName.

Parameters:
newOutputFile - Value to assign to OutputFile.

outputFileName

public java.lang.String outputFileName()
Get the value of OutputFileName.

Returns:
Value of OutputFile.

setOutputFileName

public void setOutputFileName(java.lang.String name)
Set the value of OutputFileName. Must be used AFTER setOutputFile.

Parameters:
name - the name of OutputFile.

preProcess

public void preProcess(ResultProducer rp)
                throws java.lang.Exception
Prepare for the results to be received.

Specified by:
preProcess in interface ResultListener
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.

Specified by:
postProcess in interface ResultListener
Parameters:
rp - the ResultProducer that generated the results
Throws:
java.lang.Exception - if an error occurs

determineColumnConstraints

public java.lang.String[] determineColumnConstraints(ResultProducer rp)
                                              throws java.lang.Exception
Determines if there are any constraints (imposed by the destination) on the 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.

Specified by:
determineColumnConstraints in interface ResultListener
Parameters:
rp - the ResultProducer to which the constraints will apply
Returns:
an array of column names to which resutltProducer's results will be restricted.
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
Just prints out each result as it is received.

Specified by:
acceptResult in interface ResultListener
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.

isResultRequired

public boolean isResultRequired(ResultProducer rp,
                                java.lang.Object[] key)
                         throws java.lang.Exception
Always says a result is required. If this is the first call, prints out the header for the csv output.

Specified by:
isResultRequired in interface ResultListener
Parameters:
rp - the ResultProducer wanting to generate the result
key - The key for which a result may be needed.
Returns:
true if the result should be calculated.
Throws:
java.lang.Exception - if it could not be determined if the result is needed.