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## weka.experiment
Class CSVResultListener

    java.lang.Object
      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

CSVResultListener outputs the received results in csv format to a Writer

Version:
  $Revision: 1.10 $
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 filename
  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.

### 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.

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