use super::Embeddable;
use super::IOResult;
use super::IOValue;

pub trait DomainDecode<D: Embeddable> {
    fn decode_embedded_iovalue(&mut self, v: IOValue) -> IOResult<D>;
}

pub struct IOValueDomainDecode;

impl DomainDecode<IOValue> for IOValueDomainDecode {
    fn decode_embedded_iovalue(&mut self, v: IOValue) -> IOResult<IOValue> {
        Ok(v)
    }
}

pub struct NoEmbeddedDomainDecode;

impl<D: Embeddable> DomainDecode<D> for NoEmbeddedDomainDecode {
    fn decode_embedded_iovalue(&mut self, _v: IOValue) -> IOResult<D> {
        Err(std::io::Error::new(std::io::ErrorKind::Unsupported,
                                "Embedded values not supported here"))
    }
}