Amazon.DynamoDBv2.DocumentModel.Table.ValidateConditional C# (CSharp) Method

        private static void ValidateConditional(IConditionalOperationConfig config)
        {
            if (config == null)
                return;

            int conditionsSet = 0;
            conditionsSet += config.Expected != null ? 1 : 0;
            conditionsSet += config.ExpectedState != null ? 1 : 0;
            conditionsSet += config.ConditionalExpression != null && config.ConditionalExpression.ExpressionStatement != null ? 1 : 0;

            if (conditionsSet > 1)
                throw new InvalidOperationException("Only one of the conditonal properties Expected, ExpectedState and ConditionalExpression can be set.");
        }