Collection<TreeElement> (@NotNull TreeElement node) { if (!(node instanceof JavaClassTreeElement classNode)) return Collections.emptyList(); final PsiClass aClass = classNode.getElement(); if (aClass == null) return Collections.emptyList(); Collection<PsiElement> inherited = new LinkedHashSet<>(); Collection<PsiElement> ownChildren = JavaClassTreeElement.getOwnChildren(aClass); aClass.processDeclarations(new AddAllMembersProcessor(inherited, aClass), ResolveState.initial(), null, aClass); inherited.removeAll(ownChildren); if (aClass instanceof PsiAnonymousClass) { final PsiElement element = ((PsiAnonymousClass)aClass).getBaseClassReference().resolve(); if (element instanceof PsiClass) { ContainerUtil.addAll(inherited, ((PsiClass)element).getInnerClasses()); } } List<TreeElement> array = new ArrayList<>(); for (PsiElement child : inherited) { if (!child.isValid()) continue; if (child instanceof PsiClass) { array.add(new JavaClassTreeElement((PsiClass)child, true)); } else if (child instanceof PsiField) { array.add(new PsiFieldTreeElement((PsiField)child, true)); } else if (child instanceof PsiMethod) { array.add(new PsiMethodTreeElement((PsiMethod)child, true)); } else if (child instanceof PsiClassInitializer) { array.add(new ClassInitializerTreeElement((PsiClassInitializer)child)); } } return array; }