net-core-api 0.5.3

This crate defines core traits and types for the api defined through the net-stalker project. Amazon Ion is used as the serialization format.
Documentation 
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use ion_rs;

use ion_rs::IonReader;
use ion_rs::IonWriter;

use crate::core::api::API;
use crate::core::decoder_api::Decoder;
use crate::core::encoder_api::Encoder;
use crate::core::typed_api::Typed;

const DATA_TYPE: &str = "string";

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct StringDTO {
    value: String,
}

impl API for StringDTO {}

impl StringDTO {
    pub fn new(value: &str) -> Self {
        StringDTO { value: value.to_string() }
    }

    pub fn get_value(&self) -> &str {
        &self.value
    }
}

impl Typed for StringDTO {
    fn get_type(&self) -> &str {
        DATA_TYPE
    }

    fn get_data_type() -> &'static str where Self : Sized {
        DATA_TYPE
    }
}

impl Encoder for StringDTO {
    fn encode(&self) -> Vec<u8> {
        let buffer: Vec<u8> = Vec::new();

        let binary_writer_builder = ion_rs::BinaryWriterBuilder::new();
        
        let mut writer = binary_writer_builder.build(buffer.clone()).unwrap();
        
        writer.step_in(ion_rs::IonType::Struct).expect("Error while creating an ion struct");

        writer.set_field_name("value");
        writer.write_string(&self.value).unwrap();

        writer.step_out().unwrap();
        writer.flush().unwrap();

        writer.output().as_slice().to_owned()
    }
}

impl Decoder for StringDTO {
    fn decode(data: &[u8]) -> Self {
        let mut binary_user_reader = ion_rs::ReaderBuilder::new().build(data).unwrap();
        binary_user_reader.next().unwrap();
        binary_user_reader.step_in().unwrap();

        binary_user_reader.next().unwrap();
        let value = binary_user_reader.read_string().unwrap();

        StringDTO::new(value.text())
    }
}


#[cfg(test)]
mod tests {
    use ion_rs::IonType;
    use ion_rs::IonReader;
    use ion_rs::ReaderBuilder;
    use ion_rs::StreamItem;

    use crate::core::decoder_api::Decoder;
    use crate::core::encoder_api::Encoder;
    use crate::core::typed_api::Typed;


    use super::StringDTO;


    #[test]
    fn reader_correctly_read_encoded_string() {
        const STRING_VALUE: &str = "value";
        let string = StringDTO::new(STRING_VALUE);

        let mut binary_user_reader = ReaderBuilder::new().build(string.encode()).unwrap();

        assert_eq!(StreamItem::Value(IonType::Struct), binary_user_reader.next().unwrap());
        binary_user_reader.step_in().unwrap();

        assert_eq!(StreamItem::Value(IonType::String), binary_user_reader.next().unwrap());
        assert_eq!("value", binary_user_reader.field_name().unwrap());
        assert_eq!(STRING_VALUE,  binary_user_reader.read_string().unwrap().text());

        binary_user_reader.step_out().unwrap();
    }
    
    #[test]
    fn endec_string() {
        const STRING_VALUE: &str = "value";
        let string = StringDTO::new(STRING_VALUE);

        assert_eq!(string, StringDTO::decode(&string.encode()));
    }

    #[test]
    fn test_getting_data_types() {
        const STRING_VALUE: &str = "value";
        let string = StringDTO::new(STRING_VALUE);
        
        assert_eq!(string.get_type(), StringDTO::get_data_type());
        assert_eq!(string.get_type(), super::DATA_TYPE);
    }
}