Bug 97821 [package explorer] eternal loop when recreating deleted compilation unit
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
while (element != null && fViewer.getSelection().isEmpty()) {
						
						element= getParent(element);
						if (element != null) {
							newSelection= new StructuredSelection(element);
							fViewer.setSelection(newSelection, true);
						}
					}
				} finally {
					fViewer.addSelectionChangedListener(fSelectionListener);
				}
			}
			return true;
		}
		return false;
	}
	
	private boolean isOnClassPath(IFile file) {
		IJavaProject jproject= JavaCore.create(file.getProject());
		return jproject.isOnClasspath(file);
	}
	/**
	 * Returns the element's parent.
	 * 
	 * @return the parent or <code>null</code> if there's no parent
	 */
	private Object getParent(Object element) {
		if (element instanceof IJavaElement)
			return ((IJavaElement)element).getParent();