spatialbench-cli/src/tbl.rs

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//
//   http://www.apache.org/licenses/LICENSE-2.0
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//! Implementations of [`Source`] for generating data in TBL format

use super::generate::Source;
use spatialbench::generators::{
    BuildingGenerator, CustomerGenerator, DriverGenerator, TripGenerator, VehicleGenerator,
};
use std::io::Write;

/// Define a Source that writes the table in TBL format
macro_rules! define_tbl_source {
    ($SOURCE_NAME:ident, $GENERATOR_TYPE:ty) => {
        pub struct $SOURCE_NAME {
            inner: $GENERATOR_TYPE,
        }

        impl $SOURCE_NAME {
            pub fn new(inner: $GENERATOR_TYPE) -> Self {
                Self { inner }
            }
        }

        impl Source for $SOURCE_NAME {
            fn header(&self, buffer: Vec<u8>) -> Vec<u8> {
                // TBL source does not have a header
                buffer
            }

            fn create(self, mut buffer: Vec<u8>) -> Vec<u8> {
                for item in self.inner.iter() {
                    // The default Display impl writes TBL format
                    writeln!(&mut buffer, "{item}").expect("writing to memory is infallible");
                }
                buffer
            }
        }
    };
}

// Define .tbl sources for all tables
define_tbl_source!(VehicleTblSource, VehicleGenerator<'static>);
define_tbl_source!(DriverTblSource, DriverGenerator<'static>);
define_tbl_source!(CustomerTblSource, CustomerGenerator<'static>);
define_tbl_source!(TripTblSource, TripGenerator);
define_tbl_source!(BuildingTblSource, BuildingGenerator<'static>);