Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 


Eclipse Platform
Release 3.5

org.eclipse.ui.model
Class BaseWorkbenchContentProvider

java.lang.Object
  extended by 
org.eclipse.ui.model.BaseWorkbenchContentProvider
All Implemented Interfaces:
IContentProvider, IStructuredContentProvider, ITreeContentProvider
Direct Known Subclasses:
WorkbenchContentProvider

public class BaseWorkbenchContentProvider
extends Object
implements ITreeContentProvider

Tree content provider for objects that can be adapted to the interface IWorkbenchAdapter.

This class may be instantiated, or subclassed.

Since:
3.0
See Also:
IWorkbenchAdapter

Constructor Summary
BaseWorkbenchContentProvider ()
          Creates a new workbench content provider.
 
Method Summary
 void dispose ()
          Disposes of this content provider.
protected   IWorkbenchAdapter getAdapter ( Object element)
          Returns the implementation of IWorkbenchAdapter for the given object.
  Object[] getChildren ( Object element)
          Returns the child elements of the given parent element.
  Object[] getElements ( Object element)
          Returns the elements to display in the viewer when its input is set to the given element.
  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.
 void inputChanged ( Viewer viewer, Object oldInput, Object newInput)
          Notifies this content provider that the given viewer's input has been switched to a different element.
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BaseWorkbenchContentProvider

public BaseWorkbenchContentProvider()
Creates a new workbench content provider.

Method Detail

dispose

public void dispose()
Description copied from interface: IContentProvider
Disposes of this content provider. This is called by the viewer when it is disposed.

The viewer should not be updated during this call, as it is in the process of being disposed.

Specified by:
dispose in interface IContentProvider

getAdapter

protected 
IWorkbenchAdapter getAdapter(
Object element)
Returns the implementation of IWorkbenchAdapter for the given object. Returns null if the adapter is not defined or the object is not adaptable.

Parameters:
element - the element
Returns:
the corresponding workbench adapter object

getChildren

public 
Object[] getChildren(
Object element)
Description copied from interface: ITreeContentProvider
Returns the child elements of the given parent element.

The difference between this method and IStructuredContentProvider.getElements is that getElements is called to obtain the tree viewer's root elements, whereas getChildren is used to obtain the children of a given parent element in the tree (including a root).

The result is not modified by the viewer.

Specified by:
getChildren in interface ITreeContentProvider
Parameters:
element - the parent element
Returns:
an array of child elements

getElements

public 
Object[] getElements(
Object element)
Description copied from interface: IStructuredContentProvider
Returns the elements to display in the viewer when its input is set to the given element. These elements can be presented as rows in a table, items in a list, etc. The result is not modified by the viewer.

NOTE: For instances where the viewer is displaying a tree containing a single 'root' element it is still necessary that the 'input' does not return itself from this method. This leads to recursion issues (see bug 9262).

Specified by:
getElements in interface IStructuredContentProvider
Parameters:
element - the input element
Returns:
the array of elements to display in the viewer

getParent

public 
Object getParent(
Object element)
Description copied from interface: ITreeContentProvider
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.

Specified by:
getParent in interface ITreeContentProvider
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)
Description copied from interface: ITreeContentProvider
Returns whether the given element has children.

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.

Specified by:
hasChildren in interface ITreeContentProvider
Parameters:
element - the element
Returns:
true if the given element has children, and false if it has no children

inputChanged

public void inputChanged(
Viewer viewer,
                         
Object oldInput,
                         
Object newInput)
Description copied from interface: IContentProvider
Notifies this content provider that the given viewer's input has been switched to a different element.

A typical use for this method is registering the content provider as a listener to changes on the new input (using model-specific means), and deregistering the viewer from the old input. In response to these change notifications, the content provider should update the viewer (see the add, remove, update and refresh methods on the viewers).

The viewer should not be updated during this call, as it might be in the process of being disposed.

Specified by:
inputChanged in interface IContentProvider
Parameters:
viewer - the viewer
oldInput - the old input element, or null if the viewer did not previously have an input
newInput - the new input element, or null if the viewer does not have an input

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire