weka.core.json

Class JSONNode

java.lang.Object

javax.swing.tree.DefaultMutableTreeNode

weka.core.json.JSONNode

All Implemented Interfaces:

Serializable, Cloneable, MutableTreeNode, TreeNode

public class JSONNode
extends DefaultMutableTreeNode

Container class for storing a JSON data structure.

Version:

$Revision: 12111 $

Author:

FracPete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	JSONNode.NodeType The type of a node.

Field Summary

Fields inherited from class javax.swing.tree.DefaultMutableTreeNode

EMPTY_ENUMERATION

Constructor Summary

Constructors

Constructor and Description
JSONNode() Initializes the root container.
JSONNode(String name, Boolean value) Initializes the primitive container.
JSONNode(String name, Double value) Initializes the primitive container.
JSONNode(String name, Integer value) Initializes the primitive container.
JSONNode(String name, String value) Initializes the primitive container.

Method Summary

Modifier and Type	Method and Description
JSONNode	addArray(String name) Adds an array child to the object.
JSONNode	addArrayElement(Object value) Adds an array element child to the array.
JSONNode	addNull(String name) Adds a "null" child to the object.
JSONNode	addNullArrayElement() Adds a null array element child to the array.
JSONNode	addObject(String name) Adds an object child to the object.
JSONNode	addObjectArrayElement() Add a key-value object child into the array
JSONNode	addPrimitive(String name, Boolean value) Adds a key-value child to the object.
JSONNode	addPrimitive(String name, Double value) Adds a key-value child to the object.
JSONNode	addPrimitive(String name, Integer value) Adds a key-value child to the object.
JSONNode	addPrimitive(String name, String value) Adds a key-value child to the object.
JSONNode	getChild(String name) Returns the child with the given name.
String	getName() Returns the name of the node.
JSONNode.NodeType	getNodeType() Returns the type of the container.
Object	getValue() Returns the stored value.
Object	getValue(Object defValue) Returns the stored value.
boolean	hasChild(String name) Checks whether the node has a child with the given name.
boolean	isAnonymous() Checks whether the node is anonymous.
boolean	isArray() Returns wether the node is an array.
boolean	isObject() Returns wether the node is an object.
boolean	isPrimitive() Returns whether the node stores a primitive value or a an array/object.
static void	main(String[] args) Only for testing.
static JSONNode	read(Reader reader) Reads the JSON object from the given reader.
String	toString() Returns a string representation of the node.
void	toString(StringBuffer buffer) Dumps the node structure into JSON format.

Methods inherited from class javax.swing.tree.DefaultMutableTreeNode

add, breadthFirstEnumeration, children, clone, depthFirstEnumeration, getAllowsChildren, getChildAfter, getChildAt, getChildBefore, getChildCount, getDepth, getFirstChild, getFirstLeaf, getIndex, getLastChild, getLastLeaf, getLeafCount, getLevel, getNextLeaf, getNextNode, getNextSibling, getParent, getPath, getPreviousLeaf, getPreviousNode, getPreviousSibling, getRoot, getSharedAncestor, getSiblingCount, getUserObject, getUserObjectPath, insert, isLeaf, isNodeAncestor, isNodeChild, isNodeDescendant, isNodeRelated, isNodeSibling, isRoot, pathFromAncestorEnumeration, postorderEnumeration, preorderEnumeration, remove, remove, removeAllChildren, removeFromParent, setAllowsChildren, setParent, setUserObject

Methods inherited from class java.lang.Object

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

Constructor Detail

JSONNode

public JSONNode()

Initializes the root container.

JSONNode

public JSONNode(String name,
                Boolean value)

Initializes the primitive container.

Parameters:

name - the name

value - the primitive value

JSONNode

public JSONNode(String name,
                Integer value)

Initializes the primitive container.

Parameters:

name - the name

value - the primitive value

JSONNode

public JSONNode(String name,
                Double value)

Initializes the primitive container.

Parameters:

name - the name

value - the primitive value

JSONNode

public JSONNode(String name,
                String value)

Initializes the primitive container.

Parameters:

name - the name

value - the primitive value

Method Detail

isAnonymous

public boolean isAnonymous()

Checks whether the node is anonymous.

Returns:

true if no name available

getName

public String getName()

Returns the name of the node.

Returns:

the name, null for anonymous nodes

getValue

public Object getValue()

Returns the stored value.

Returns:

the stored value, can be null

getValue

public Object getValue(Object defValue)

Returns the stored value.

Parameters:

defValue - the default value, if value is null

Returns:

the stored value, can be null

isPrimitive

public boolean isPrimitive()

Returns whether the node stores a primitive value or a an array/object.

Returns:

true if a primitive, false in case of an array/object

isArray

public boolean isArray()

Returns wether the node is an array.

Returns:

true if the node is array container

isObject

public boolean isObject()

Returns wether the node is an object.

Returns:

true if the node is object container

getNodeType

public JSONNode.NodeType getNodeType()

Returns the type of the container.

Returns:

the type

addNull

public JSONNode addNull(String name)

Adds a "null" child to the object.

Parameters:

name - the name of the null value

Returns:

the new node, or null if none added

addPrimitive

public JSONNode addPrimitive(String name,
                             Boolean value)

Adds a key-value child to the object.

Parameters:

name - the name of the pair

value - the value

Returns:

the new node, or null if none added

addPrimitive

public JSONNode addPrimitive(String name,
                             Integer value)

Adds a key-value child to the object.

Parameters:

name - the name of the pair

value - the value

Returns:

the new node, or null if none added

addPrimitive

public JSONNode addPrimitive(String name,
                             Double value)

Adds a key-value child to the object.

Parameters:

name - the name of the pair

value - the value

Returns:

the new node, or null if none added

addPrimitive

public JSONNode addPrimitive(String name,
                             String value)

Adds a key-value child to the object.

Parameters:

name - the name of the pair

value - the value

Returns:

the new node, or null if none added

addArray

public JSONNode addArray(String name)

Adds an array child to the object.

Parameters:

name - the name of the pair

Returns:

the new node, or null if none added

addNullArrayElement

public JSONNode addNullArrayElement()

Adds a null array element child to the array.

Returns:

the new node, or null if none added

addObjectArrayElement

public JSONNode addObjectArrayElement()

Add a key-value object child into the array

Returns:

the newly added node

addArrayElement

public JSONNode addArrayElement(Object value)

Adds an array element child to the array.

Parameters:

value - the value of the element array

Returns:

the new node, or null if none added

addObject

public JSONNode addObject(String name)

Adds an object child to the object.

Parameters:

name - the name of the pair

Returns:

the new node, or null if none added

hasChild

public boolean hasChild(String name)

Checks whether the node has a child with the given name.

Parameters:

name - the name of the child

Returns:

true if child with that name is available

getChild

public JSONNode getChild(String name)

Returns the child with the given name.

Parameters:

name - the name of the child

Returns:

the child if available, null otherwise

toString

public void toString(StringBuffer buffer)

Dumps the node structure into JSON format.

Parameters:

buffer - the buffer to add the data to

toString

public String toString()

Returns a string representation of the node.

Overrides:

toString in class DefaultMutableTreeNode

Returns:

the string representation

read

public static JSONNode read(Reader reader)
                     throws Exception

Reads the JSON object from the given reader.

Parameters:

reader - the reader to read the JSON object from

Returns:

the generated JSON object

Throws:

Exception - if parsing fails

main

public static void main(String[] args)
                 throws Exception

Only for testing. Generates a simple JSON object and displays it.

Parameters:

args - ignored

Throws:

Exception - if something goes wrong