boolean (@NotNull Project project, @NotNull PsiFile containingFile, @NotNull PsiClass aClass, @NotNull ProgressIndicator progress, @NotNull GlobalUsageHelper helper) { Boolean result = helper.unusedClassCache.get(aClass); if (result == null) { result = isReallyUsed(project, containingFile, aClass, progress, helper); helper.unusedClassCache.put(aClass, result); } return result; }