PsiExpression (@NotNull PsiElement element) { PsiExpression qualifier = null; if (element instanceof PsiReferenceExpression) { qualifier = ((PsiReferenceExpression)element).getQualifierExpression(); } else if (element instanceof PsiMethodCallExpression) { qualifier = ((PsiMethodCallExpression)element).getMethodExpression().getQualifierExpression(); } return qualifier instanceof PsiQualifiedExpression ? null : qualifier; }