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// =============================================================================
// Copyright (c) 2026 Haixing Hu.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0.
// =============================================================================
// facade.
//! Provider-opened asynchronous reader envelope.
use qubit_io::AsyncInput;
use crate::metadata::OpenedFileInfo;
use crate::read::AsyncFileReader;
/// An already-open asynchronous reader bound to provider identity.
///
/// # Examples
///
/// ```rust
/// use qubit_fs::metadata::{FileKind, FileMetadata, FileSystemId, OpenedFileInfo};
/// use qubit_fs::path::Path;
/// use qubit_fs::spi::OpenedAsyncReader;
///
/// let info = OpenedFileInfo::new(FileSystemId::new("doc")?, Path::parse("/x")?)
/// .with_metadata(FileMetadata::new(FileKind::File));
/// assert!(std::any::type_name::<OpenedAsyncReader>().contains("OpenedAsyncReader"));
/// assert_eq!("/x", info.path().as_str());
/// # Ok::<(), qubit_fs::FsError>(())
/// ```
pub struct OpenedAsyncReader {
/// Resource identity claimed by the provider.
info: OpenedFileInfo,
/// Provider asynchronous byte-input session.
reader: Box<dyn AsyncInput<Item = u8> + Send>,
}
impl OpenedAsyncReader {
/// Wraps a provider-opened reader session and its claimed identity.
///
/// # Parameters
/// - `info`: Identity claimed for the opened resource.
/// - `reader`: Provider asynchronous byte-input session.
///
/// # Returns
/// An opened-reader envelope for facade validation.
#[inline]
#[must_use]
pub fn new(info: OpenedFileInfo, reader: Box<dyn AsyncInput<Item = u8> + Send>) -> Self {
Self { info, reader }
}
/// Returns the immutable provider-opened identity.
///
/// # Returns
/// The identity claimed by the provider.
#[inline]
#[must_use]
pub fn info(&self) -> &OpenedFileInfo {
&self.info
}
/// Transfers the validated reader into the facade handle.
///
/// # Returns
/// A facade-owned asynchronous reader.
#[inline]
#[must_use]
pub(crate) fn into_reader(self) -> AsyncFileReader {
AsyncFileReader::new(self.info, self.reader)
}
}