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use glib::prelude::*;
use glib::subclass::prelude::*;
use glib::translate::*;
use glib::{Cast, Error};
use crate::Cancellable;
use crate::{IOStream, InputStream, OutputStream};
use std::ptr;
use once_cell::sync::Lazy;
pub trait IOStreamImpl: ObjectImpl + IOStreamImplExt + Send {
fn input_stream(&self, stream: &Self::Type) -> InputStream {
self.parent_input_stream(stream)
}
fn output_stream(&self, stream: &Self::Type) -> OutputStream {
self.parent_output_stream(stream)
}
fn close(&self, stream: &Self::Type, cancellable: Option<&Cancellable>) -> Result<(), Error> {
self.parent_close(stream, cancellable)
}
}
pub trait IOStreamImplExt: ObjectSubclass {
fn parent_input_stream(&self, stream: &Self::Type) -> InputStream;
fn parent_output_stream(&self, stream: &Self::Type) -> OutputStream;
fn parent_close(
&self,
stream: &Self::Type,
cancellable: Option<&Cancellable>,
) -> Result<(), Error>;
}
impl<T: IOStreamImpl> IOStreamImplExt for T {
fn parent_input_stream(&self, stream: &Self::Type) -> InputStream {
unsafe {
let data = T::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GIOStreamClass;
let f = (*parent_class)
.get_input_stream
.expect("No parent class implementation for \"input_stream\"");
from_glib_none(f(stream.unsafe_cast_ref::<IOStream>().to_glib_none().0))
}
}
fn parent_output_stream(&self, stream: &Self::Type) -> OutputStream {
unsafe {
let data = T::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GIOStreamClass;
let f = (*parent_class)
.get_output_stream
.expect("No parent class implementation for \"output_stream\"");
from_glib_none(f(stream.unsafe_cast_ref::<IOStream>().to_glib_none().0))
}
}
fn parent_close(
&self,
stream: &Self::Type,
cancellable: Option<&Cancellable>,
) -> Result<(), Error> {
unsafe {
let data = T::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GIOStreamClass;
let mut err = ptr::null_mut();
if let Some(f) = (*parent_class).close_fn {
if from_glib(f(
stream.unsafe_cast_ref::<IOStream>().to_glib_none().0,
cancellable.to_glib_none().0,
&mut err,
)) {
Ok(())
} else {
Err(from_glib_full(err))
}
} else {
Ok(())
}
}
}
}
unsafe impl<T: IOStreamImpl> IsSubclassable<T> for IOStream {
fn class_init(class: &mut ::glib::Class<Self>) {
Self::parent_class_init::<T>(class);
let klass = class.as_mut();
klass.get_input_stream = Some(stream_get_input_stream::<T>);
klass.get_output_stream = Some(stream_get_output_stream::<T>);
klass.close_fn = Some(stream_close::<T>);
}
}
static OUTPUT_STREAM_QUARK: Lazy<glib::Quark> =
Lazy::new(|| glib::Quark::from_str("gtk-rs-subclass-output-stream"));
static INPUT_STREAM_QUARK: Lazy<glib::Quark> =
Lazy::new(|| glib::Quark::from_str("gtk-rs-subclass-input-stream"));
unsafe extern "C" fn stream_get_input_stream<T: IOStreamImpl>(
ptr: *mut ffi::GIOStream,
) -> *mut ffi::GInputStream {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.imp();
let wrap: Borrowed<IOStream> = from_glib_borrow(ptr);
let ret = imp.input_stream(wrap.unsafe_cast_ref());
if let Some(old_stream) = wrap.qdata::<InputStream>(*INPUT_STREAM_QUARK) {
assert_eq!(
old_stream.as_ref(),
&ret,
"Did not return same input stream again"
);
}
wrap.set_qdata(*INPUT_STREAM_QUARK, ret.clone());
ret.to_glib_none().0
}
unsafe extern "C" fn stream_get_output_stream<T: IOStreamImpl>(
ptr: *mut ffi::GIOStream,
) -> *mut ffi::GOutputStream {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.imp();
let wrap: Borrowed<IOStream> = from_glib_borrow(ptr);
let ret = imp.output_stream(wrap.unsafe_cast_ref());
if let Some(old_stream) = wrap.qdata::<OutputStream>(*OUTPUT_STREAM_QUARK) {
assert_eq!(
old_stream.as_ref(),
&ret,
"Did not return same output stream again"
);
}
wrap.set_qdata(*OUTPUT_STREAM_QUARK, ret.clone());
ret.to_glib_none().0
}
unsafe extern "C" fn stream_close<T: IOStreamImpl>(
ptr: *mut ffi::GIOStream,
cancellable: *mut ffi::GCancellable,
err: *mut *mut glib::ffi::GError,
) -> glib::ffi::gboolean {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.imp();
let wrap: Borrowed<IOStream> = from_glib_borrow(ptr);
match imp.close(
wrap.unsafe_cast_ref(),
Option::<Cancellable>::from_glib_borrow(cancellable)
.as_ref()
.as_ref(),
) {
Ok(_) => glib::ffi::GTRUE,
Err(e) => {
if !err.is_null() {
*err = e.into_raw();
}
glib::ffi::GFALSE
}
}
}