weka.core.converters
Class ArffLoader

java.lang.Object
  |
  +--weka.core.converters.AbstractLoader
        |
        +--weka.core.converters.ArffLoader

All Implemented Interfaces:

Loader, java.io.Serializable

public class ArffLoader

extends AbstractLoader

Reads a source that is in arff text format.

Author:

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

See Also:

Loader, Serialized Form

Field Summary

protected Instances

m_structure Holds the determined structure (header) of the data set.

Fields inherited from class weka.core.converters.AbstractLoader

BATCH, INCREMENTAL, m_Retrieval, NONE

Constructor Summary

ArffLoader()

Method Summary

Instances	getDataSet() Return the full data set.
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.
static void	main(java.lang.String[] args) Main method.
void	reset() Resets the Loader ready to read a new data set
void	setSource(java.io.File file) Resets the Loader object and sets the source of the data set to be the supplied File object.
void	setSource(java.io.InputStream in) Resets the Loader object and sets the source of the data set to be the supplied InputStream.

Methods inherited from class weka.core.converters.AbstractLoader

getRetrieval, setRetrieval

Methods inherited from class java.lang.Object

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

Field Detail

m_structure

protected Instances m_structure

Holds the determined structure (header) of the data set.

Constructor Detail

ArffLoader

public ArffLoader()

Method Detail

reset

public void reset()

Resets the Loader ready to read a new data set

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.

Overrides:

setSource in class AbstractLoader

Parameters:

file - the source file.

Throws:

java.io.IOException - if an error occurs

setSource

public void setSource(java.io.InputStream in)
               throws java.io.IOException

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

Overrides:

setSource in class AbstractLoader

Parameters:

in - the source InputStream.

Throws:

java.io.IOException - always thrown.

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.

Overrides:

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.

Overrides:

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.

Overrides:

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.

Parameters:

args - should contain the name of an input file.