Bug 114774 [javadoc location] validate does not work with ! in path
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavadocConfigurationBlock.java
*/
		public Object[] getChildren(Object element) {
			List list= fProvider.getChildren(element);
			ArrayList res= new ArrayList();
			if (list != null) {
				for (int i= 0; i < list.size(); i++) {
					Object curr= list.get(i);
					if (fProvider.isFolder(curr)) {
						res.add(curr);
					}
				}
			}
			return res.toArray();
		}
	
		/* non java-doc
		 * @see ITreeContentProvider#getElements
		 */
		public Object[] getElements(Object element) {
			return new Object[] {fProvider.getRoot() };
		}
	
		/* non java-doc
		 * @see IContentProvider#dispose
		 */
		public void dispose() {
		}
	}
		
	private static class ZipDialogLabelProvider extends LabelProvider {