groovy.util

## Class Node

- java.lang.Object
- - groovy.util.Node

All Implemented Interfaces:
  java.io.Serializable

    public class Node
    extends java.lang.Object
    implements java.io.Serializable

Represents an arbitrary tree node which can be used for structured metadata or any arbitrary XML-like tree. A node can have a name, a value and an optional Map of attributes. Typically the name is a String and a value is either a String or a List of other Nodes, though the types are extensible to provide a flexible structure, e.g. you could use a QName as the name which includes a namespace URI and a local name. Or a JMX ObjectName etc. So this class can represent metadata like `{foo a=1 b="abc"}` or nested metadata like `{foo a=1 b="123" { bar x=12 text="hello" }}`

See Also:
  Serialized Form

### Constructor Summary

Constructors
Constructor and Description
`Node(Node parent, java.lang.Object name)` Creates a new Node named `name` and if a parent is supplied, adds the newly created node as a child of the parent.
`Node(Node parent, java.lang.Object name, java.util.Map attributes)` Creates a new Node named `name` with attributes specified in the `attributes` Map.
`Node(Node parent, java.lang.Object name, java.util.Map attributes, java.lang.Object value)` Creates a new Node named `name` with value `value` and with attributes specified in the `attributes` Map.
`Node(Node parent, java.lang.Object name, java.lang.Object value)` Creates a new Node named `name` with value `value` and if a parent is supplied, adds the newly created node as a child of the parent.

### Method Summary

Methods
`boolean` `append(Node child)`
`Node` `appendNode(java.lang.Object name)`
`Node` `appendNode(java.lang.Object name, java.util.Map attributes)`
`Node` `appendNode(java.lang.Object name, java.util.Map attributes, java.lang.Object value)`
`Node` `appendNode(java.lang.Object name, java.lang.Object value)`
`java.lang.Object` `attribute(java.lang.Object key)`
`java.util.Map` `attributes()`
`java.util.List` `breadthFirst()` Provide a collection of all the nodes in the tree using a breadth-first traversal.
`java.util.List` `children()`
`java.util.List` `depthFirst()` Provide a collection of all the nodes in the tree using a depth first traversal.
`java.lang.Object` `get(java.lang.String key)` Provides lookup of elements by non-namespaced name
`NodeList` `getAt(QName name)` Provides lookup of elements by QName.
`java.util.Iterator` `iterator()`
`java.lang.Object` `name()`
`Node` `parent()`
`void` `plus(Closure c)` Adds sibling nodes (defined using builder-style notation via a Closure) after the current node.
`void` `print(java.io.PrintWriter out)`
`boolean` `remove(Node child)`
`Node` `replaceNode(Closure c)` Replaces the current node with nodes defined using builder-style notation via a Closure.
`protected static void` `setMetaClass(MetaClass metaClass, java.lang.Class nodeClass)`
`protected void` `setParent(Node parent)`
`void` `setValue(java.lang.Object value)`
`java.lang.String` `text()`
`java.lang.String` `toString()`
`java.lang.Object` `value()`

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

### Constructor Detail

#### Node

    public Node(Node parent,
        java.lang.Object name)

Creates a new Node named `name` and if a parent is supplied, adds the newly created node as a child of the parent.

Parameters:
  `parent` - the parent node or null if no parent
  `name` - the name of the node

#### Node

    public Node(Node parent,
        java.lang.Object name,
        java.lang.Object value)

Creates a new Node named `name` with value `value` and if a parent is supplied, adds the newly created node as a child of the parent.

Parameters:
  `parent` - the parent node or null if no parent
  `name` - the name of the node
  `value` - the Node value, e.g. some text but in general any Object

#### Node

    public Node(Node parent,
        java.lang.Object name,
        java.util.Map attributes)

Creates a new Node named `name` with attributes specified in the `attributes` Map. If a parent is supplied, the newly created node is added as a child of the parent.

Parameters:
  `parent` - the parent node or null if no parent
  `name` - the name of the node
  `attributes` - a Map of name-value pairs

#### Node

    public Node(Node parent,
        java.lang.Object name,
        java.util.Map attributes,
        java.lang.Object value)

Creates a new Node named `name` with value `value` and with attributes specified in the `attributes` Map. If a parent is supplied, the newly created node is added as a child of the parent.

Parameters:
  `parent` - the parent node or null if no parent
  `name` - the name of the node
  `attributes` - a Map of name-value pairs
  `value` - the Node value, e.g. some text but in general any Object

### Method Detail

#### append

    public boolean append(Node child)

#### remove

    public boolean remove(Node child)

#### appendNode

    public Node appendNode(java.lang.Object name,
                  java.util.Map attributes)

#### appendNode

    public Node appendNode(java.lang.Object name)

#### appendNode

    public Node appendNode(java.lang.Object name,
                  java.lang.Object value)

#### appendNode

    public Node appendNode(java.lang.Object name,
                  java.util.Map attributes,
                  java.lang.Object value)

#### replaceNode

    public Node replaceNode(Closure c)

Replaces the current node with nodes defined using builder-style notation via a Closure.

Parameters:
  `c` - A Closure defining the new nodes using builder-style notation.
Returns:
  the last appended node

#### plus

    public void plus(Closure c)

Adds sibling nodes (defined using builder-style notation via a Closure) after the current node.

Parameters:
  `c` - A Closure defining the new sibling nodes to add using builder-style notation.

#### setMetaClass

    protected static void setMetaClass(MetaClass metaClass,
                    java.lang.Class nodeClass)

#### text

    public java.lang.String text()

#### iterator

    public java.util.Iterator iterator()

#### children

    public java.util.List children()

#### attributes

    public java.util.Map attributes()

#### attribute

    public java.lang.Object attribute(java.lang.Object key)

#### name

    public java.lang.Object name()

#### value

    public java.lang.Object value()

#### setValue

    public void setValue(java.lang.Object value)

#### parent

    public Node parent()

#### setParent

    protected void setParent(Node parent)

#### get

    public java.lang.Object get(java.lang.String key)

Provides lookup of elements by non-namespaced name

Parameters:
  `key` - the name (or shortcut key) of the node(s) of interest
Returns:
  the nodes which match key

#### getAt

    public NodeList getAt(QName name)

Provides lookup of elements by QName.

Parameters:
  `name` - the QName of interest
Returns:
  the nodes matching name

#### depthFirst

    public java.util.List depthFirst()

Provide a collection of all the nodes in the tree using a depth first traversal.

Returns:
  the list of (depth-first) ordered nodes

#### breadthFirst

    public java.util.List breadthFirst()

Provide a collection of all the nodes in the tree using a breadth-first traversal.

Returns:
  the list of (breadth-first) ordered nodes

#### toString

    public java.lang.String toString()

Overrides:
  `toString` in class `java.lang.Object`

#### print

    public void print(java.io.PrintWriter out)