private boolean isImmutableCollection(@NotNull PsiField field) {
      if (!field.hasModifierProperty(PsiModifier.FINAL)) {
        return false;
      }
      final PsiExpression initializer = PsiUtil.skipParenthesizedExprDown(field.getInitializer());
      if (ExpressionUtils.isNullLiteral(initializer)) {
        return true;
      }
      if (!(initializer instanceof PsiMethodCallExpression methodCallExpression)) {
        return false;
      }
      final PsiMethod method = methodCallExpression.resolveMethod();
      if (method == null || myMethodMatcher.matches(method)) {
        return true;
      }
      if (ExpressionUtils.hasExpressionCount(methodCallExpression.getArgumentList(), 0) && "asList".equals(method.getName())) {
        final PsiClass containingClass = method.getContainingClass();
        if (containingClass != null && CommonClassNames.JAVA_UTIL_ARRAYS.equals(containingClass.getQualifiedName())) {
          // empty Arrays.asList() is harmless
          return true;
        }
      }
      final PsiClass aClass = PsiUtil.resolveClassInClassTypeOnly(methodCallExpression.getType());
      return aClass != null && JCiPUtil.isImmutable(aClass);
    }
private boolean isImmutableCollection(@NotNull PsiField field)