Node (Vaadin Platform (vaadin-platform-javadoc) 14.1.16 API)

java.lang.Object
- com.vaadin.flow.dom.Node<N>

Type Parameters:

N - The narrowed type of the node

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

Element, ShadowRoot
```
public abstract class Node<N extends Node<N>>
extends Object
implements Serializable
```
Represents a node in the DOM.
Contains methods for updating and querying hierarchical structure.

Since:

1.0

Author:

Vaadin Ltd

See Also:

Serialized Form

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`Node(StateNode node, ElementStateProvider stateProvider)` Private constructor for initializing with an existing node and state provider.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`N`	`accept(NodeVisitor visitor)` Applies the `visitor` for the node.
`N`	`appendChild(Element... children)` Adds the given children as the last children of this element.
`N`	`appendVirtualChild(Element... children)` Appends the given children as the virtual children of the element.
`protected void`	`ensureChildHasParent(Element child, boolean internalCheck)` Ensures that the `child` has the correct parent.
`boolean`	`equals(Object obj)`
`Element`	`getChild(int index)` Returns the child element at the given position.
`int`	`getChildCount()` Gets the number of child elements.
`Stream<Element>`	`getChildren()` Gets all the children of this element.
`StateNode`	`getNode()` Gets the node this element is connected to.
`Node`	`getParentNode()` Gets the parent node.
`protected abstract N`	`getSelf()` Gets the narrow typed reference to this object.
`ElementStateProvider`	`getStateProvider()` Gets the state provider for this element.
`int`	`hashCode()`
`int`	`indexOfChild(Element child)` Returns the index of the specified `child` in the children list, or -1 if this list does not contain the `child`.
`N`	`insertChild(int index, Element... children)` Inserts the given child element(s) at the given position.
`boolean`	`isVirtualChild()` Gets whether this element is a virtual child of its parent.
`N`	`removeAllChildren()` Removes all child elements, including elements only present at the client-side.
`N`	`removeChild(Element... children)` Removes the given child element(s).
`N`	`removeChild(int index)` Removes the child at the given index.
`N`	`setChild(int index, Element child)` Replaces the child at the given position with the given child element.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Node
```
protected Node(StateNode node,
               ElementStateProvider stateProvider)
```
    Private constructor for initializing with an existing node and state provider.
    
    Parameters:
    
    node - the state node, not null
    
    stateProvider - the state provider, not null
- Method Detail
  - getNode
```
public StateNode getNode()
```
    Gets the node this element is connected to.
    This method is meant for internal use only.
    
    Returns:
    
    the node for this element
  - getStateProvider
```
public ElementStateProvider getStateProvider()
```
    Gets the state provider for this element.
    This method is meant for internal use only.
    
    Returns:
    
    the state provider for this element
  - getChildCount
```
public int getChildCount()
```
    Gets the number of child elements.
    
    Returns:
    
    the number of child elements
  - getChild
```
public Element getChild(int index)
```
    Returns the child element at the given position.
    
    Parameters:
    
    index - the index of the child element to return
    
    Returns:
    
    the child element
  - getChildren
```
public Stream<Element> getChildren()
```
    Gets all the children of this element.
    
    Returns:
    
    a stream of children
  - appendChild
```
public N appendChild(Element... children)
```
    Adds the given children as the last children of this element.
    
    Parameters:
    
    children - the element(s) to add
    
    Returns:
    
    this element
  - appendVirtualChild
```
public N appendVirtualChild(Element... children)
```
    Appends the given children as the virtual children of the element.
    The virtual child is not really a child of the DOM element. The client-side counterpart is created in the memory but it's not attached to the DOM tree. The resulting element is referenced via the server side Element in JS function call as usual.
    
    Parameters:
    
    children - the element(s) to add
    
    Returns:
    
    this element
  - isVirtualChild
```
public boolean isVirtualChild()
```
    Gets whether this element is a virtual child of its parent.
    
    Returns:
    
    true if the element has a parent and the element is a virtual child of it, false otherwise.
  - insertChild
```
public N insertChild(int index,
                     Element... children)
```
    Inserts the given child element(s) at the given position.
    
    Parameters:
    
    index - the position at which to insert the new child
    
    children - the child element(s) to insert
    
    Returns:
    
    this element
  - indexOfChild
```
public int indexOfChild(Element child)
```
    Returns the index of the specified child in the children list, or -1 if this list does not contain the child.
    
    Parameters:
    
    child - the child element
    
    Returns:
    
    index of the child or -1 if it's not a child
  - setChild
```
public N setChild(int index,
                  Element child)
```
    Replaces the child at the given position with the given child element.
    
    Parameters:
    
    index - the position of the child element to replace
    
    child - the child element to insert
    
    Returns:
    
    this element
  - removeChild
```
public N removeChild(Element... children)
```
    Removes the given child element(s).
    
    Parameters:
    
    children - the child element(s) to remove
    
    Returns:
    
    this element
  - removeChild
```
public N removeChild(int index)
```
    Removes the child at the given index.
    
    Parameters:
    
    index - the index of the child to remove
    
    Returns:
    
    this element
  - removeAllChildren
```
public N removeAllChildren()
```
    Removes all child elements, including elements only present at the client-side.
    
    Returns:
    
    this element
  - getParentNode
```
public Node getParentNode()
```
    Gets the parent node.
    
    Returns:
    
    the parent node or null if this element does not have a parent
  - getSelf
```
protected abstract N getSelf()
```
    Gets the narrow typed reference to this object.
    
    Returns:
    
    this object casted to its type
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - accept
```
public N accept(NodeVisitor visitor)
```
    Applies the visitor for the node.
    
    Parameters:
    
    visitor - the visitor to apply to the node
    
    Returns:
    
    this element
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - ensureChildHasParent
```
protected void ensureChildHasParent(Element child,
                                    boolean internalCheck)
```
    Ensures that the child has the correct parent.
    Default implementation doesn't do anything. Subclasses may override the method to implement their own behavior.
    
    Parameters:
    
    child - the element to check for its parent
    
    internalCheck - whether to use assertions or throw an exception on failure

Class Node<N extends Node<N>>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Node

Method Detail

getNode

getStateProvider

getChildCount

getChild

getChildren

appendChild

appendVirtualChild

isVirtualChild

insertChild

indexOfChild

setChild

removeChild

removeChild

removeAllChildren

getParentNode

getSelf

hashCode

accept

equals

ensureChildHasParent