weka.core.converters

Class JSONSaver

java.lang.Object

weka.core.converters.AbstractSaver

weka.core.converters.AbstractFileSaver

weka.core.converters.JSONSaver

All Implemented Interfaces:

Serializable, CapabilitiesHandler, BatchConverter, FileSourcedConverter, Saver, EnvironmentHandler, OptionHandler, RevisionHandler

public class JSONSaver
extends AbstractFileSaver
implements BatchConverter

Writes to a destination that is in JSON format.
The data can be compressed with gzip, in order to save space.

For more information, see JSON homepage:
http://www.json.org/

Valid options are:

 -i <the input file>
  The input file
 

 -o <the output file>
  The output file
 

 -C <class index>
  The class index (first and last are valid as well).
  (default: last)
 

 -compress
  Compresses the data (uses '.json.gz' as extension instead of '.json')
  (default: off)
 

Version:

$Revision: 10203 $

Author:

FracPete (fracpete at waikato dot ac dot nz)

See Also:

Saver, Serialized Form

Field Summary

Fields inherited from interface weka.core.converters.Saver

BATCH, INCREMENTAL, NONE

Constructor Summary

Constructors

Constructor and Description
JSONSaver() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
String	classIndexTipText() Returns the tip text for this property.
String	compressOutputTipText() Returns the tip text for this property.
Capabilities	getCapabilities() Returns the Capabilities of this saver.
String	getClassIndex() Get the index of the class attribute.
boolean	getCompressOutput() Gets whether the output data is compressed.
String	getFileDescription() Returns a description of the file type.
String[]	getFileExtensions() Gets all the file extensions used for this type of file.
String[]	getOptions() returns the options of the current setup.
String	getRevision() Returns the revision string.
String	globalInfo() Returns a string describing this Saver.
Enumeration<Option>	listOptions() Returns an enumeration describing the available options.
static void	main(String[] args) Main method.
void	resetOptions() Resets the Saver.
void	setClassIndex(String value) Sets index of the class attribute.
void	setCompressOutput(boolean value) Sets whether to compress the output.
void	setDestination(OutputStream output) Sets the destination output stream.
void	setFile(File outputFile) Sets the destination file.
void	setInstances(Instances instances) Sets instances that should be stored.
void	setOptions(String[] options) Parses the options for this object.
void	writeBatch() Writes a Batch of instances.

Methods inherited from class weka.core.converters.AbstractFileSaver

cancel, filePrefix, getFileExtension, getUseRelativePath, getWriter, resetWriter, retrieveDir, retrieveFile, runFileSaver, setDestination, setDir, setDirAndPrefix, setEnvironment, setFilePrefix, setUseRelativePath, useRelativePathTipText

Methods inherited from class weka.core.converters.AbstractSaver

getInstances, getWriteMode, resetStructure, setRetrieval, setStructure, writeIncremental

Methods inherited from class java.lang.Object

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

Constructor Detail

JSONSaver

public JSONSaver()

Constructor.

Method Detail

globalInfo

public String globalInfo()

Returns a string describing this Saver.

Returns:

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

listOptions

public Enumeration<Option> listOptions()

Returns an enumeration describing the available options.

Specified by:

listOptions in interface OptionHandler

Overrides:

listOptions in class AbstractFileSaver

Returns:

an enumeration of all the available options.

getOptions

public String[] getOptions()

returns the options of the current setup.

Specified by:

getOptions in interface OptionHandler

Overrides:

getOptions in class AbstractFileSaver

Returns:

the current options

setOptions

public void setOptions(String[] options)
                throws Exception

Parses the options for this object.

Valid options are:

 -i <the input file>
  The input file
 

 -o <the output file>
  The output file
 

 -C <class index>
  The class index (first and last are valid as well).
  (default: last)
 

 -compress
  Compresses the data (uses '.json.gz' as extension instead of '.json')
  (default: off)
 

Specified by:

setOptions in interface OptionHandler

Overrides:

setOptions in class AbstractFileSaver

Parameters:

options - the options to use

Throws:

Exception - if setting of options fails

getFileDescription

public String getFileDescription()

Returns a description of the file type.

Specified by:

getFileDescription in interface FileSourcedConverter

Specified by:

getFileDescription in class AbstractFileSaver

Returns:

a short file description

getFileExtensions

public String[] getFileExtensions()

Gets all the file extensions used for this type of file.

Specified by:

getFileExtensions in interface FileSourcedConverter

Overrides:

getFileExtensions in class AbstractFileSaver

Returns:

the file extensions

setFile

public void setFile(File outputFile)
             throws IOException

Sets the destination file.

Specified by:

setFile in interface FileSourcedConverter

Specified by:

setFile in interface Saver

Overrides:

setFile in class AbstractFileSaver

Parameters:

outputFile - the destination file.

Throws:

IOException - throws an IOException if file cannot be set

resetOptions

public void resetOptions()

Resets the Saver.

Overrides:

resetOptions in class AbstractFileSaver

classIndexTipText

public String classIndexTipText()

Returns the tip text for this property.

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

getClassIndex

public String getClassIndex()

Get the index of the class attribute.

Returns:

the index of the class attribute

setClassIndex

public void setClassIndex(String value)

Sets index of the class attribute.

Parameters:

value - the index of the class attribute

compressOutputTipText

public String compressOutputTipText()

Returns the tip text for this property.

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

getCompressOutput

public boolean getCompressOutput()

Gets whether the output data is compressed.

Returns:

true if the output data is compressed

setCompressOutput

public void setCompressOutput(boolean value)

Sets whether to compress the output.

Parameters:

value - if truee the output will be compressed

getCapabilities

public Capabilities getCapabilities()

Returns the Capabilities of this saver.

Specified by:

getCapabilities in interface CapabilitiesHandler

Overrides:

getCapabilities in class AbstractSaver

Returns:

the capabilities of this object

See Also:

Capabilities

setInstances

public void setInstances(Instances instances)

Sets instances that should be stored.

Specified by:

setInstances in interface Saver

Overrides:

setInstances in class AbstractSaver

Parameters:

instances - the instances

setDestination

public void setDestination(OutputStream output)
                    throws IOException

Sets the destination output stream.

Specified by:

setDestination in interface Saver

Overrides:

setDestination in class AbstractFileSaver

Parameters:

output - the output stream.

Throws:

IOException - throws an IOException if destination cannot be set

writeBatch

public void writeBatch()
                throws IOException

Writes a Batch of instances.

Specified by:

writeBatch in interface Saver

Specified by:

writeBatch in class AbstractSaver

Throws:

IOException - throws IOException if saving in batch mode is not possible

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision

main

public static void main(String[] args)

Main method.

Parameters:

args - should contain the options of a Saver.