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## weka.core.converters
Class CSVLoader

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

All Implemented Interfaces:
  java.io.Serializable, BatchConverter, FileSourcedConverter, Loader

    public class CSVLoader

extends AbstractLoader
implements FileSourcedConverter, BatchConverter

Reads a text file that is comma or tab delimited..

Version:
  $Revision: 1.9.2.5 $
Author:
  Mark Hall (mhall@cs.waikato.ac.nz)
See Also:
  `Loader`, Serialized Form

Field Summary
`static java.lang.String` | `FILE_EXTENSION`

Constructor Summary
`CSVLoader()`

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(Instances structure)` CSVLoader is unable to process a data set incrementally.
`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.
`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

### CSVLoader

    public CSVLoader()

Method Detail

### 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

### 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

  Specified by:
    `reset` in interface `Loader`
  Overrides:
    `reset` in class `AbstractLoader`

### 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(Instances structure)
                             throws java.io.IOException

  CSVLoader is unable to process a data set incrementally.

  Specified by:
    `getNextInstance` in interface `Loader`
  Specified by:
    `getNextInstance` in class `AbstractLoader`
  Parameters:
    `structure` - ignored
  Returns:
    never returns without throwing an exception
  Throws:
    `java.io.IOException` - always. CSVLoader is unable to process a data set incrementally.

### main

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

  Main method.

  Parameters:
    `args` - should contain the name of an input file.

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