@Override public void unregisterContribution( Object contribution, String extensionPoint, ComponentInstance contributor) { if (contribution instanceof FlavorDescriptor) { FlavorDescriptor flavor = (FlavorDescriptor) contribution; flavorReg.removeContribution(flavor); } else if (contribution instanceof Resource) { Resource resource = (Resource) contribution; unregisterResource(resource); } else if (contribution instanceof SimpleStyle) { SimpleStyle style = (SimpleStyle) contribution; unregisterResource(getResourceFromStyle(style)); } else if (contribution instanceof PageDescriptor) { PageDescriptor page = (PageDescriptor) contribution; if (page.hasResources() && !Framework.getRuntime().isShuttingDown()) { WebResourceManager wrm = Framework.getService(WebResourceManager.class); wrm.unregisterResourceBundle(page.getComputedResourceBundle()); } pageReg.removeContribution(page); } else if (contribution instanceof NegotiationDescriptor) { NegotiationDescriptor neg = (NegotiationDescriptor) contribution; negReg.removeContribution(neg); } else { log.error( String.format( "Unknown contribution to the theme " + "styling service, extension point '%s': '%s", extensionPoint, contribution)); } }