Package weka.core.json

Class JSONInstances

  • public class JSONInstances
extends java.lang.Object
    Class for transforming Instances objects into JSON objects and vice versa. Missing values get stored as "?".
    Version:
    $Revision: 9664 $
    Author:
    FracPete (fracpete at waikato dot ac dot nz)
    See Also:
    MISSING_VALUE

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String ATTRIBUTES
      the attributes object.
      static java.lang.String CLASS
      the class attribute indicator.
      static java.lang.String DATA
      the data section.
      static java.lang.String DATEFORMAT
      the dateformat attribute.
      static java.lang.String HEADER
      the header section.
      static java.lang.String LABELS
      the labels attribute.
      static java.lang.String MISSING_VALUE
      the missing value indicator.
      static java.lang.String NAME
      the name attribute.
      static java.lang.String RELATION
      the relation name.
      static java.lang.String SPARSE
      the sparse attribute.
      static java.lang.String SPARSE_SEPARATOR
      the separator for index/value in case of sparse instances.
      static java.lang.String TYPE
      the type attribute.
      static java.lang.String VALUES
      the values attribute.
      static java.lang.String WEIGHT
      the weight attribute.

    • Constructor Summary

      Constructors 
      Constructor Description
      JSONInstances()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void main​(java.lang.String[] args)
      For testing only.
      static Instances toHeader​(JSONNode json)
      Turns a JSON object, if possible, into an Instances object (only header).
      static Instances toInstances​(JSONNode json)
      Turns a JSON object, if possible, into an Instances object.
      static JSONNode toJSON​(Instances inst)
      Turns the Instances object into a JSON object.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • HEADER

        public static final java.lang.String HEADER
        the header section.
        See Also:
        Constant Field Values

      • RELATION

        public static final java.lang.String RELATION
        the relation name.
        See Also:
        Constant Field Values

      • ATTRIBUTES

        public static final java.lang.String ATTRIBUTES
        the attributes object.
        See Also:
        Constant Field Values

      • CLASS

        public static final java.lang.String CLASS
        the class attribute indicator.
        See Also:
        Constant Field Values

      • LABELS

        public static final java.lang.String LABELS
        the labels attribute.
        See Also:
        Constant Field Values

      • WEIGHT

        public static final java.lang.String WEIGHT
        the weight attribute.
        See Also:
        Constant Field Values

      • DATEFORMAT

        public static final java.lang.String DATEFORMAT
        the dateformat attribute.
        See Also:
        Constant Field Values

      • SPARSE

        public static final java.lang.String SPARSE
        the sparse attribute.
        See Also:
        Constant Field Values

      • VALUES

        public static final java.lang.String VALUES
        the values attribute.
        See Also:
        Constant Field Values

      • SPARSE_SEPARATOR

        public static final java.lang.String SPARSE_SEPARATOR
        the separator for index/value in case of sparse instances.
        See Also:
        Constant Field Values

      • MISSING_VALUE

        public static final java.lang.String MISSING_VALUE
        the missing value indicator.
        See Also:
        Constant Field Values

    • Constructor Detail

      • JSONInstances

        public JSONInstances()

    • Method Detail

      • toInstances

        public static Instances toInstances​(JSONNode json)
        Turns a JSON object, if possible, into an Instances object.
        Parameters:
        json - the JSON object to convert
        Returns:
        the generated Instances object, null if not possible

      • toHeader

        public static Instances toHeader​(JSONNode json)
        Turns a JSON object, if possible, into an Instances object (only header).
        Parameters:
        json - the JSON object to convert
        Returns:
        the generated Instances header object, null if not possible

      • toJSON

        public static JSONNode toJSON​(Instances inst)
        Turns the Instances object into a JSON object.
        Parameters:
        inst - the Instances to turn into a JSON object
        Returns:
        the JSON object

      • main

        public static void main​(java.lang.String[] args)
                 throws java.lang.Exception
        For testing only.
        Parameters:
        args - expects a dataset as first parameter
        Throws:
        java.lang.Exception - if something goes wrong