TreeStructureAdvisor (Eclipse Platform API Specification)

java.lang.Object
- org.eclipse.jface.databinding.viewers.TreeStructureAdvisor

```
public abstract class TreeStructureAdvisor
extends Object
```
Instances of this class can be used to improve accuracy and performance of an ObservableListTreeContentProvider or an ObservableSetTreeContentProvider. This class is intended to be subclassed by clients.

Since:

1.2

Constructor Summary

Constructors
Constructor Description

TreeStructureAdvisor()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`getParent(Object element)`	Returns the parent for the given element, or `null` indicating that the parent can't be computed.
`Boolean`	`hasChildren(Object element)`	Returns whether the given element has children, or `null` if the actual children collection should be consulted.

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

- Constructor Detail
  - TreeStructureAdvisor
```
public TreeStructureAdvisor()
```
- Method Detail
  - getParent
```
public Object getParent(Object element)
```
    Returns the parent for the given element, or null indicating that the parent can't be computed. In this case the tree-structured viewer can't expand a given node correctly if requested. The default implementation returns null; clients should override.
    
    Parameters:
    
    element - the element
    
    Returns:
    
    the parent element, or null if it has none or if the parent cannot be computed
  - hasChildren
```
public Boolean hasChildren(Object element)
```
    Returns whether the given element has children, or null if the actual children collection should be consulted. The default implementation returns null; clients should override.
    Intended as an optimization for when the viewer does not need the actual children. Clients may be able to implement this more efficiently than getChildren.
    
    Parameters:
    
    element - the element
    
    Returns:
    
    Boolean.TRUE if the given element has children, Boolean.FALSE if the given element never has children, or null if the children collection should be consulted.