void () { final List<UIThemeMetadata> themeMetadata = ContainerUtil.mapNotNull(EP_NAME.getExtensionList(), UIThemeMetadataProvider::loadMetadata); for (UIThemeMetadata metadata : themeMetadata) { myCache.put(metadata, ContainerUtil.newMapFromValues(metadata.getUiKeyMetadata().iterator(), o -> o.getKey())); } }