Bug 18486 Need documentation for startup extension point.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/browsing/JavaBrowsingContentProvider.java
if (!root.isExternal()) {
				Object[] children= root.getChildren();
				for (int k= 0; k < children.length; k++) 
					list.add(children[k]);
			}
			else if (hasChildren(root)) {
				list.add(root);
			} 
		}
		return concatenate(list.toArray(), project.getNonJavaResources());
	}
	
	/* (non-Javadoc)
	 * Method declared on IContentProvider.
	 */
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		super.inputChanged(viewer, oldInput, newInput);
		if (newInput instanceof Collection) {
			
			Collection col= (Collection)newInput;
			if (!col.isEmpty())
				newInput= col.iterator().next();
			else
				newInput= null;
		}
		fInput= newInput;
	}
	
	/* (non-Javadoc)
	 * Method declared on IContentProvider.