weka.filters
Class NullFilter

java.lang.Object
  extended byweka.filters.Filter
      extended byweka.filters.NullFilter
All Implemented Interfaces:
java.io.Serializable

public class NullFilter
extends Filter

A simple instance filter that allows no instances to pass through. Basically just for testing purposes.

Version:
$Revision: 1.7 $
Author:
Len Trigg (trigg@cs.waikato.ac.nz)
See Also:
Serialized Form

Field Summary
 
Fields inherited from class weka.filters.Filter
m_NewBatch
 
Constructor Summary
NullFilter()
           
 
Method Summary
 boolean input(Instance instance)
          Input an instance for filtering.
static void main(java.lang.String[] argv)
          Main method for testing this class.
 boolean setInputFormat(Instances instanceInfo)
          Sets the format of the input instances.
 
Methods inherited from class weka.filters.Filter
batchFilterFile, batchFinished, bufferInput, copyStringValues, copyStringValues, filterFile, flushInput, getInputFormat, getInputStringIndex, getOutputFormat, getOutputStringIndex, getStringIndices, inputFormat, inputFormatPeek, isOutputFormatDefined, numPendingOutput, output, outputFormat, outputFormatPeek, outputPeek, push, resetQueue, setOutputFormat, useFilter
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

NullFilter

public NullFilter()
Method Detail

setInputFormat

public boolean setInputFormat(Instances instanceInfo)
                       throws java.lang.Exception
Sets the format of the input instances.

Overrides:
setInputFormat in class Filter
Parameters:
instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
Returns:
true if the outputFormat may be collected immediately
Throws:
java.lang.Exception - if the inputFormat can't be set successfully

input

public boolean input(Instance instance)
Input an instance for filtering. Ordinarily the instance is processed and made available for output immediately. Some filters require all instances be read before producing output.

Overrides:
input in class Filter
Parameters:
instance - the input instance
Returns:
true if the filtered instance may now be collected with output().
Throws:
java.lang.IllegalStateException - if no input format has been set.

main

public static void main(java.lang.String[] argv)
Main method for testing this class.

Parameters:
argv - should contain arguments to the filter: use -h for help