exon 0.32.4

A platform for scientific data processing and analysis.
Documentation 
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// Copyright 2024 WHERE TRUE Technologies.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::sync::Arc;

use super::{
    hmm_dom_schema_builder::HMMDomTabSchemaBuilder,
    table_provider::{ListingHMMDomTabTable, ListingHMMDomTabTableOptions},
};
use crate::datasources::{exon_listing_table_options::ExonListingConfig, ScanFunction};
use datafusion::{
    datasource::{function::TableFunctionImpl, TableProvider},
    error::Result,
    logical_expr::Expr,
};

/// A table function that returns a table provider for a HMMDomTab file.
#[derive(Debug, Default)]
pub struct HMMDomTabScanFunction {}

impl TableFunctionImpl for HMMDomTabScanFunction {
    fn call(&self, exprs: &[Expr]) -> Result<Arc<dyn TableProvider>> {
        let listing_scan_function = ScanFunction::try_from(exprs)?;

        let schema = HMMDomTabSchemaBuilder::default().build();

        let listing_table_options =
            ListingHMMDomTabTableOptions::new(listing_scan_function.file_compression_type);

        let listing_table_config = ExonListingConfig::new_with_options(
            listing_scan_function.listing_table_url,
            listing_table_options,
        );

        let listing_table = ListingHMMDomTabTable::new(listing_table_config, schema);

        Ok(Arc::new(listing_table))
    }
}