weka.core.converters
Class C45Loader

java.lang.Object
  weka.core.converters.AbstractLoader
      weka.core.converters.C45Loader

All Implemented Interfaces:

BatchConverter, FileSourcedConverter, IncrementalConverter, Loader, java.io.Serializable

public class C45Loader

extends AbstractLoader

implements FileSourcedConverter, BatchConverter, IncrementalConverter

Reads C4.5 input files. Takes a filestem or filestem with .names or .data appended. Assumes that both .names and .data exist in the directory of the supplied filestem.

Version:

$Revision: 1.9 $

Author:

Mark Hall (mhall@cs.waikato.ac.nz)

See Also:

Loader, Serialized Form

Field Summary

static java.lang.String

FILE_EXTENSION

Constructor Summary

C45Loader()

Method Summary

Instances	getDataSet() Return the full data set.
java.lang.String	getFileDescription() Returns a description of the file type.
java.lang.String	getFileExtension() Get the file extension used for arff files
Instance	getNextInstance() Read the data set incrementally---get the next instance in the data set or returns null if there are no more instances to get.
Instances	getStructure() Determines and returns (if possible) the structure (internally the header) of the data set as an empty set of instances.
java.lang.String	globalInfo() Returns a string describing this attribute evaluator
static void	main(java.lang.String[] args) Main method for testing this class.
void	reset() Resets the Loader ready to read a new data set
java.io.File	retrieveFile() get the File specified as the source
void	setFile(java.io.File file) sets the source File
void	setSource(java.io.File file) Resets the Loader object and sets the source of the data set to be the supplied File object.

Methods inherited from class weka.core.converters.AbstractLoader

setSource

Methods inherited from class java.lang.Object

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

Field Detail

FILE_EXTENSION

public static java.lang.String FILE_EXTENSION

Constructor Detail

C45Loader

public C45Loader()

Method Detail

globalInfo

public java.lang.String globalInfo()

Returns a string describing this attribute evaluator

Returns:

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

reset

public void reset()

Resets the Loader ready to read a new data set

getFileExtension

public java.lang.String getFileExtension()

Get the file extension used for arff files

Specified by:

getFileExtension in interface FileSourcedConverter

Returns:

the file extension

getFileDescription

public java.lang.String getFileDescription()

Returns a description of the file type.

Specified by:

getFileDescription in interface FileSourcedConverter

Returns:

a short file description

retrieveFile

public java.io.File retrieveFile()

get the File specified as the source

Specified by:

retrieveFile in interface FileSourcedConverter

Returns:

the source file

setFile

public void setFile(java.io.File file)
             throws java.io.IOException

sets the source File

Specified by:

setFile in interface FileSourcedConverter

Parameters:

file - the source file

Throws:

java.io.IOException - if an error occurs

setSource

public void setSource(java.io.File file)
               throws java.io.IOException

Resets the Loader object and sets the source of the data set to be the supplied File object.

Specified by:

setSource in interface Loader

Overrides:

setSource in class AbstractLoader

Parameters:

file - the source file.

Throws:

java.io.IOException - if an error occurs

getStructure

public Instances getStructure()
                       throws java.io.IOException

Determines and returns (if possible) the structure (internally the header) of the data set as an empty set of instances.

Specified by:

getStructure in interface Loader

Specified by:

getStructure in class AbstractLoader

Returns:

the structure of the data set as an empty set of Instances

Throws:

java.io.IOException - if an error occurs

getDataSet

public Instances getDataSet()
                     throws java.io.IOException

Return the full data set. If the structure hasn't yet been determined by a call to getStructure then method should do so before processing the rest of the data set.

Specified by:

getDataSet in interface Loader

Specified by:

getDataSet in class AbstractLoader

Returns:

the structure of the data set as an empty set of Instances

Throws:

java.io.IOException - if there is no source or parsing fails

getNextInstance

public Instance getNextInstance()
                         throws java.io.IOException

Read the data set incrementally---get the next instance in the data set or returns null if there are no more instances to get. If the structure hasn't yet been determined by a call to getStructure then method should do so before returning the next instance in the data set. If it is not possible to read the data set incrementally (ie. in cases where the data set structure cannot be fully established before all instances have been seen) then an exception should be thrown.

Specified by:

getNextInstance in interface Loader

Specified by:

getNextInstance in class AbstractLoader

Returns:

the next instance in the data set as an Instance object or null if there are no more instances to be read

Throws:

java.io.IOException - if there is an error during parsing

main

public static void main(java.lang.String[] args)

Main method for testing this class.

Parameters:

args - should contain [.names | data]