Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/sorters/CommonSorterDescriptorManager.java
.getDeclaringExtension()
																		.getNamespaceIdentifier() }),
										null);
					}
				} else {
					NavigatorPlugin
							.logError(
									0,
									NLS
											.bind(
													CommonNavigatorMessages.CommonSorterDescriptorManager_A_navigatorContent_extesnion_in_0_,
													element.getNamespaceIdentifier()),
									null);
				}
			}
			return super.readElement(element);
		}
	}
	private Set getCommonSorters(INavigatorContentDescriptor contentDescriptor) {
		Set descriptors = null;
		synchronized (sortersMap) {
			descriptors = (Set) sortersMap.get(contentDescriptor);
			if (descriptors == null) {
				sortersMap.put(contentDescriptor, descriptors = new HashSet());
			}
		}
		return descriptors;
	}
}