void (@NotNull PsiMethod baseMethod, @NotNull PsiMethod overridingMethod) { PsiClass clazz = baseMethod.getContainingClass(); if (clazz == null) { return; } List<OverriddenMethodPair> methods = myOverriddenMethods.get(clazz); if (methods == null) { myOverriddenMethods.put(clazz, methods = new ArrayList<>()); } methods.add(new OverriddenMethodPair(baseMethod, overridingMethod)); }