/**
	   * Configuration elements in the typical plugin.xml file can specify class,
	   * id, and other similar attributes. This method can be used to determine the
	   * unique ID assigned to a class in the plugin.xml file. However, if the same
	   * class is assigned multiple unique IDs, then this method will fail and throw
	   * a RuntimeException.
	   * <br><br>
	   * Example use: String id = getUniqueID(getClass(), "defaultHandler");
	   * <br><br>
	   * Lazy loading features are preserved when using this method.
	   * 
	   * @param clazz the class for which a unique ID should be retrieved.
	   * @param specification the name of the attribute whose value is the class
	   * @return the unique ID for the class, or null if one is not specified
	   * @throws RuntimeException if more than one valid ID is found.
	   */	
	  public static String getUniqueID(Class<?> clazz, String specification) {
		  String id = classToIdMap.get(clazz);
		  if(id == null) {
			  try {			
				  IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();
				  IExtensionPoint[] extensionPoints = extensionRegistry.getExtensionPoints();
				  for(IExtensionPoint extensionPoint : extensionPoints) {
					  IConfigurationElement[] configurationElements
					  = extensionRegistry.getConfigurationElementsFor(extensionPoint.
							  getUniqueIdentifier());
	
					  int idCount = 0;
					  for(IConfigurationElement configurationElement : configurationElements) {
						  String attribute = configurationElement.getAttribute(specification);
	
						  String namespaceIdentifier = configurationElement.getNamespaceIdentifier();
						  if(attribute != null
								  && !namespaceIdentifier.equals("org.eclipse.emf.ecore.editor") // ignore this namespace, it causes problems
								  && attribute.equals(clazz.getName())) {
							  Object object = configurationElement.createExecutableExtension(specification);
							  if(object != null) {
								  Class<?> class1 = object.getClass();
								  Class<?> class2 = clazz;
								  if(class1.equals(class2)) {
									  if(idCount == 0) {
										  id = configurationElement.getAttribute("id");
										  idCount++;
									  }
	
									  else {
										  throw new RuntimeException("Multiple IDs" +
												  " found for " + specification + " " + clazz.getName());
									  }
								  }
							  }
						  }
					  }
				  }
			  }
	
			  catch (Exception ex) {
				  LogUtil.error(ex);
			  }
		  }

		  return id;
	  }