Package weka.core.converters
Class C45Loader
- java.lang.Object
-
- weka.core.converters.AbstractLoader
-
- weka.core.converters.AbstractFileLoader
-
- weka.core.converters.C45Loader
-
- All Implemented Interfaces:
java.io.Serializable
,BatchConverter
,FileSourcedConverter
,IncrementalConverter
,Loader
,EnvironmentHandler
,RevisionHandler
public class C45Loader extends AbstractFileLoader implements BatchConverter, IncrementalConverter
Reads a file that is C45 format. Can take a filestem or filestem with .names or .data appended. Assumes that path/<filestem>.names and path/<filestem>.data exist and contain the names and data respectively.- Version:
- $Revision: 1.16 $
- Author:
- Mark Hall (mhall@cs.waikato.ac.nz)
- See Also:
Loader
, Serialized Form
-
-
Field Summary
Fields Modifier and Type Field Description static java.lang.String
FILE_EXTENSION
the file extension-
Fields inherited from class weka.core.converters.AbstractFileLoader
FILE_EXTENSION_COMPRESSED
-
Fields inherited from interface weka.core.converters.Loader
BATCH, INCREMENTAL, NONE
-
-
Constructor Summary
Constructors Constructor Description C45Loader()
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description 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 filesjava.lang.String[]
getFileExtensions()
Gets all the file extensions used for this type of fileInstance
getNextInstance(Instances structure)
Read the data set incrementally---get the next instance in the data set or returns null if there are no more instances to get.java.lang.String
getRevision()
Returns the revision string.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 evaluatorstatic void
main(java.lang.String[] args)
Main method for testing this class.void
reset()
Resets the Loader ready to read a new data set or the same data set again.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.AbstractFileLoader
getUseRelativePath, retrieveFile, runFileLoader, setEnvironment, setFile, setUseRelativePath, useRelativePathTipText
-
Methods inherited from class weka.core.converters.AbstractLoader
setRetrieval, setSource
-
-
-
-
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() throws java.io.IOException
Resets the Loader ready to read a new data set or the same data set again.- Specified by:
reset
in interfaceLoader
- Overrides:
reset
in classAbstractFileLoader
- Throws:
java.io.IOException
- if something goes wrong
-
getFileExtension
public java.lang.String getFileExtension()
Get the file extension used for arff files- Specified by:
getFileExtension
in interfaceFileSourcedConverter
- Returns:
- the file extension
-
getFileExtensions
public java.lang.String[] getFileExtensions()
Gets all the file extensions used for this type of file- Specified by:
getFileExtensions
in interfaceFileSourcedConverter
- Returns:
- the file extensions
-
getFileDescription
public java.lang.String getFileDescription()
Returns a description of the file type.- Specified by:
getFileDescription
in interfaceFileSourcedConverter
- Returns:
- a short file description
-
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 interfaceLoader
- Overrides:
setSource
in classAbstractFileLoader
- 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 interfaceLoader
- Specified by:
getStructure
in classAbstractLoader
- 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 interfaceLoader
- Specified by:
getDataSet
in classAbstractLoader
- 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
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 interfaceLoader
- Specified by:
getNextInstance
in classAbstractLoader
- Parameters:
structure
- the dataset header information, will get updated in case of string or relational attributes- 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
-
getRevision
public java.lang.String getRevision()
Returns the revision string.- Specified by:
getRevision
in interfaceRevisionHandler
- Returns:
- the revision
-
main
public static void main(java.lang.String[] args)
Main method for testing this class.- Parameters:
args
- should contain <filestem>[.names | data]
-
-