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use super::Loader;
use crate::{LoadError, LoadingResult};
use iref::Iri;

/// Dummy loader.
///
/// A dummy loader that does not load anything.
/// Can be useful when you know that you will never need to load remote resource.
///
/// Raises an `LoadingDocumentFailed` at every attempt to load a resource.
#[derive(Debug, Default)]
pub struct NoLoader;

#[derive(Debug, thiserror::Error)]
#[error("no loader")]
pub struct CannotLoad;

impl Loader for NoLoader {
	#[inline(always)]
	async fn load(&self, url: &Iri) -> LoadingResult {
		Err(LoadError::new(url.to_owned(), CannotLoad))
	}
}