Node (Groovy 2.1.8)

java.lang.Object
- groovy.util.Node

All Implemented Interfaces:

Serializable, Cloneable
```
public class Node
extends Object
implements Serializable, Cloneable
```
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" }}

Author:

James Strachan, Paul King

See Also:
Serialized Form

Constructor Summary

Constructors
Constructor and Description
`Node(Node parent, 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, Object name, Map attributes)` Creates a new Node named `name` with attributes specified in the `attributes` Map.
`Node(Node parent, Object name, Map attributes, Object value)` Creates a new Node named `name` with value `value` and with attributes specified in the `attributes` Map.
`Node(Node parent, Object name, 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
Modifier and Type	Method and Description
`boolean`	`append(Node child)` Appends a child to the current node.
`Node`	`appendNode(Object name)` Creates a new node as a child of the current node.
`Node`	`appendNode(Object name, Map attributes)` Creates a new node as a child of the current node.
`Node`	`appendNode(Object name, Map attributes, Object value)` Creates a new node as a child of the current node.
`Node`	`appendNode(Object name, Object value)` Creates a new node as a child of the current node.
`Object`	`attribute(Object key)` Provides lookup of attributes by key.
`Map`	`attributes()` Returns a `Map` of the attributes of the node or an empty `Map` if the node does not have any attributes.
`List`	`breadthFirst()` Provides a collection of all the nodes in the tree using a breadth-first traversal.
`List`	`children()` Returns a `List` of the nodes children.
`Object`	`clone()` Creates a new Node with the same name, no parent, shallow cloned attributes and if the value is a NodeList, a (deep) clone of those nodes.
`List`	`depthFirst()` Provides a collection of all the nodes in the tree using a depth first traversal.
`Object`	`get(String key)` Provides lookup of elements by non-namespaced name
`NodeList`	`getAt(QName name)` Provides lookup of elements by QName.
`Iterator`	`iterator()` Returns an `Iterator` of the children of the node.
`Object`	`name()` Returns an `Object` representing the name of the node.
`Node`	`parent()` Returns the parent of the node.
`void`	`plus(Closure c)` Adds sibling nodes (defined using builder-style notation via a Closure) after the current node.
`void`	`print(PrintWriter out)` Writes the node to the specified `PrintWriter`.
`boolean`	`remove(Node child)` Removes a child of the current node.
`Node`	`replaceNode(Closure c)` Replaces the current node with nodes defined using builder-style notation via a Closure.
`protected static void`	`setMetaClass(MetaClass metaClass, Class nodeClass)` Extension point for subclasses to override the metaclass.
`protected void`	`setParent(Node parent)` Adds or replaces the parent of the node.
`void`	`setValue(Object value)` Adds or replaces the value of the node.
`String`	`text()` Returns the textual representation of the current node and all its child nodes.
`String`	`toString()`
`Object`	`value()` Returns an `Object` representing the value of the node.

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Node
```
public Node(Node parent,
    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,
    Object name,
    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,
    Object name,
    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,
    Object name,
    Map attributes,
    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
  - clone
```
public Object clone()
```
    Creates a new Node with the same name, no parent, shallow cloned attributes and if the value is a NodeList, a (deep) clone of those nodes.
    
    Overrides:
    
    clone in class Object
    
    Returns:
    the clone
  - append
```
public boolean append(Node child)
```
    Appends a child to the current node.
    
    Parameters:
    child - the child to append
    
    Returns:
    true
  - remove
```
public boolean remove(Node child)
```
    Removes a child of the current node.
    
    Parameters:
    child - the child to remove
    
    Returns:
    true if the param was a child of the current node
  - appendNode
```
public Node appendNode(Object name,
              Map attributes)
```
    Creates a new node as a child of the current node.
    
    Parameters:
    name - the name of the new node
    attributes - the attributes of the new node
    
    Returns:
    the newly created Node
  - appendNode
```
public Node appendNode(Object name)
```
    Creates a new node as a child of the current node.
    
    Parameters:
    name - the name of the new node
    
    Returns:
    the newly created Node
  - appendNode
```
public Node appendNode(Object name,
              Object value)
```
    Creates a new node as a child of the current node.
    
    Parameters:
    name - the name of the new node
    value - the value of the new node
    
    Returns:
    the newly created Node
  - appendNode
```
public Node appendNode(Object name,
              Map attributes,
              Object value)
```
    Creates a new node as a child of the current node.
    
    Parameters:
    name - the name of the new node
    attributes - the attributes of the new node
    value - the value of the new node
    
    Returns:
    the newly created Node
  - 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,
                Class nodeClass)
```
    Extension point for subclasses to override the metaclass. The default one supports the property and @ attribute notations.
    
    Parameters:
    metaClass - the original metaclass
    nodeClass - the class whose metaclass we wish to override (this class or a subclass)
  - text
```
public String text()
```
    Returns the textual representation of the current node and all its child nodes.
    
    Returns:
    the text value of the node including child text
  - iterator
```
public Iterator iterator()
```
    Returns an Iterator of the children of the node.
    
    Returns:
    the iterator of the nodes children
  - children
```
public List children()
```
    Returns a List of the nodes children.
    
    Returns:
    the nodes children
  - attributes
```
public Map attributes()
```
    Returns a Map of the attributes of the node or an empty Map if the node does not have any attributes.
    
    Returns:
    the attributes of the node
  - attribute
```
public Object attribute(Object key)
```
    Provides lookup of attributes by key.
    
    Parameters:
    key - the key of interest
    
    Returns:
    the attribute matching the key or null if no match exists
  - name
```
public Object name()
```
    Returns an Object representing the name of the node.
    
    Returns:
    the name or null if name is empty
  - value
```
public Object value()
```
    Returns an Object representing the value of the node.
    
    Returns:
    the value or null if value is empty
  - setValue
```
public void setValue(Object value)
```
    Adds or replaces the value of the node.
    
    Parameters:
    value - the new value of the node
  - parent
```
public Node parent()
```
    Returns the parent of the node.
    
    Returns:
    the parent or null for the root node
  - setParent
```
protected void setParent(Node parent)
```
    Adds or replaces the parent of the node.
    
    Parameters:
    parent - the new parent of the node
  - get
```
public Object get(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 List depthFirst()
```
    Provides a collection of all the nodes in the tree using a depth first traversal.
    
    Returns:
    the list of (depth-first) ordered nodes
  - breadthFirst
```
public List breadthFirst()
```
    Provides a collection of all the nodes in the tree using a breadth-first traversal.
    
    Returns:
    the list of (breadth-first) ordered nodes
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - print
```
public void print(PrintWriter out)
```
    Writes the node to the specified PrintWriter.
    
    Parameters:
    out - the writer receiving the output

Class Node

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Node

Node

Node

Node

Method Detail

clone

append

remove

appendNode

appendNode

appendNode

appendNode

replaceNode

plus

setMetaClass

text

iterator

children

attributes

attribute

name

value

setValue

parent

setParent

get

getAt

depthFirst

breadthFirst

toString

print