weka.core.json

## Class JSONNode

- java.lang.Object
- - javax.swing.tree.DefaultMutableTreeNode
  - - weka.core.json.JSONNode

- All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, javax.swing.tree.MutableTreeNode, javax.swing.tree.TreeNode

      public class JSONNode
      extends javax.swing.tree.DefaultMutableTreeNode

  Container class for storing a JSON data structure.
  Version:
    $Revision: 10203 $
  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(java.lang.String name, java.lang.Boolean value)` Initializes the primitive container.
    `JSONNode(java.lang.String name, java.lang.Double value)` Initializes the primitive container.
    `JSONNode(java.lang.String name, java.lang.Integer value)` Initializes the primitive container.
    `JSONNode(java.lang.String name, java.lang.String value)` Initializes the primitive container.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `JSONNode` | `addArray(java.lang.String name)` Adds an array child to the object.
    `JSONNode` | `addArrayElement(java.lang.Object value)` Adds an array element child to the array.
    `JSONNode` | `addNull(java.lang.String name)` Adds a "null" child to the object.
    `JSONNode` | `addNullArrayElement()` Adds a null array element child to the array.
    `JSONNode` | `addObject(java.lang.String name)` Adds an object child to the object.
    `JSONNode` | `addPrimitive(java.lang.String name, java.lang.Boolean value)` Adds a key-value child to the object.
    `JSONNode` | `addPrimitive(java.lang.String name, java.lang.Double value)` Adds a key-value child to the object.
    `JSONNode` | `addPrimitive(java.lang.String name, java.lang.Integer value)` Adds a key-value child to the object.
    `JSONNode` | `addPrimitive(java.lang.String name, java.lang.String value)` Adds a key-value child to the object.
    `JSONNode` | `getChild(java.lang.String name)` Returns the child with the given name.
    `java.lang.String` | `getName()` Returns the name of the node.
    `JSONNode.NodeType` | `getNodeType()` Returns the type of the container.
    `java.lang.Object` | `getValue()` Returns the stored value.
    `java.lang.Object` | `getValue(java.lang.Object defValue)` Returns the stored value.
    `boolean` | `hasChild(java.lang.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(java.lang.String[] args)` Only for testing.
    `static JSONNode` | `read(java.io.Reader reader)` Reads the JSON object from the given reader.
    `java.lang.String` | `toString()` Returns a string representation of the node.
    `void` | `toString(java.lang.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(java.lang.String name,
                  java.lang.Boolean value)

      Initializes the primitive container.
      Parameters:
        `name` - the name
        `value` - the primitive value

    - #### JSONNode

          public JSONNode(java.lang.String name,
                  java.lang.Integer value)

      Initializes the primitive container.
      Parameters:
        `name` - the name
        `value` - the primitive value

    - #### JSONNode

          public JSONNode(java.lang.String name,
                  java.lang.Double value)

      Initializes the primitive container.
      Parameters:
        `name` - the name
        `value` - the primitive value

    - #### JSONNode

          public JSONNode(java.lang.String name,
                  java.lang.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 java.lang.String getName()

      Returns the name of the node.
      Returns:
        the name, null for anonymous nodes

    - #### getValue

          public java.lang.Object getValue()

      Returns the stored value.
      Returns:
        the stored value, can be null

    - #### getValue

          public java.lang.Object getValue(java.lang.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(java.lang.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(java.lang.String name,
                              java.lang.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(java.lang.String name,
                              java.lang.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(java.lang.String name,
                              java.lang.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(java.lang.String name,
                              java.lang.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(java.lang.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

    - #### addArrayElement

          public JSONNode addArrayElement(java.lang.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(java.lang.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(java.lang.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(java.lang.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(java.lang.StringBuffer buffer)

      Dumps the node structure into JSON format.
      Parameters:
        `buffer` - the buffer to add the data to

    - #### toString

          public java.lang.String toString()

      Returns a string representation of the node.
      Overrides:
        `toString` in class `javax.swing.tree.DefaultMutableTreeNode`
      Returns:
        the string representation

    - #### read

          public static JSONNode read(java.io.Reader reader)
                               throws java.lang.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:
        `java.lang.Exception` - if parsing fails

    - #### main

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

      Only for testing. Generates a simple JSON object and displays it.
      Parameters:
        `args` - ignored
      Throws:
        `java.lang.Exception` - if something goes wrong