private static void makeVariableFinalIfNeeded( InsertionContext context, @Nullable PsiReferenceExpression ref) { if (!Registry.is("java.completion.make.outer.variables.final") || ref == null || PsiUtil.isLanguageLevel8OrHigher(ref) || JspPsiUtil.isInJspFile(ref)) { return; } PsiElement target = ref.resolve(); if (target instanceof PsiLocalVariable || target instanceof PsiParameter) { PsiClass placeClass = PsiTreeUtil.findElementOfClassAtOffset( context.getFile(), context.getTailOffset() - 1, PsiClass.class, false); if (placeClass != null && !PsiTreeUtil.isAncestor(placeClass, target, true) && !HighlightControlFlowUtil.isReassigned( (PsiVariable) target, new HashMap<PsiElement, Collection<ControlFlowUtil.VariableInfo>>())) { PsiModifierList modifierList = ((PsiVariable) target).getModifierList(); if (modifierList != null) { modifierList.setModifierProperty(PsiModifier.FINAL, true); } } } }