Package weka.core.json

Class JSONInstances

java.lang.Object

weka.core.json.JSONInstances

public class JSONInstances
extends 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 final String	ATTRIBUTES	the attributes object.
static final String	CLASS	the class attribute indicator.
static final String	DATA	the data section.
static final String	DATEFORMAT	the dateformat attribute.
static final String	HEADER	the header section.
static final String	LABELS	the labels attribute.
static final String	MISSING_VALUE	the missing value indicator.
static final String	NAME	the name attribute.
static final String	RELATION	the relation name.
static final String	SPARSE	the sparse attribute.
static final String	SPARSE_SEPARATOR	the separator for index/value in case of sparse instances.
static final String	TYPE	the type attribute.
static final String	VALUES	the values attribute.
static final String	WEIGHT	the weight attribute.

Constructor Summary

Constructors

Constructor	Description
JSONInstances()

Method Summary

Modifier and Type	Method	Description
static void	main(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 Details

HEADER

public static final String HEADER

the header section.

See Also:

• Constant Field Values

DATA

public static final String DATA

the data section.

See Also:

• Constant Field Values

RELATION

public static final String RELATION

the relation name.

See Also:

• Constant Field Values

ATTRIBUTES

public static final String ATTRIBUTES

the attributes object.

See Also:

• Constant Field Values

NAME

public static final String NAME

the name attribute.

See Also:

• Constant Field Values

TYPE

public static final String TYPE

the type attribute.

See Also:

• Constant Field Values

CLASS

public static final String CLASS

the class attribute indicator.

See Also:

• Constant Field Values

LABELS

public static final String LABELS

the labels attribute.

See Also:

• Constant Field Values

WEIGHT

public static final String WEIGHT

the weight attribute.

See Also:

• Constant Field Values

DATEFORMAT

public static final String DATEFORMAT

the dateformat attribute.

See Also:

• Constant Field Values

SPARSE

public static final String SPARSE

the sparse attribute.

See Also:

• Constant Field Values

VALUES

public static final String VALUES

the values attribute.

See Also:

• Constant Field Values

SPARSE_SEPARATOR

public static final String SPARSE_SEPARATOR

the separator for index/value in case of sparse instances.

See Also:

• Constant Field Values

MISSING_VALUE

public static final String MISSING_VALUE

the missing value indicator.

See Also:

• Constant Field Values

Constructor Details

JSONInstances

public JSONInstances()

Method Details

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(String[] args)
                 throws Exception

For testing only.

Parameters:

args - expects a dataset as first parameter

Throws:

Exception - if something goes wrong