Package 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, CapabilitiesIgnorer, BatchConverter, FileSourcedConverter, Saver, EnvironmentHandler, OptionHandler, RevisionHandler, WeightedInstancesHandler
public class JSONSaver extends AbstractFileSaver implements BatchConverter, WeightedInstancesHandler
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: 14861 $
Author:
FracPete (fracpete at waikato dot ac dot nz)
See Also:

  • Constructor Details

    • JSONSaver

      public JSONSaver()
      Constructor.

  • Method Details

    • 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:

    • 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.