Collection<PsiFile> (@Nullable NestedControllerCandidate nestedControllerCandidate) { if (nestedControllerCandidate != null) { final String qualifiedName = nestedControllerCandidate.controllerClass.getQualifiedName(); if (qualifiedName != null) { final Project project = nestedControllerCandidate.controllerClass.getProject(); return JavaFxControllerClassIndex.findFxmlWithController(project, qualifiedName); } } return Collections.emptyList(); }