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use crate::{
de::{SharedDeserializeRegistry, SharedPointer},
Fallible,
};
#[cfg(not(feature = "std"))]
use alloc::boxed::Box;
use core::fmt;
#[cfg(not(feature = "std"))]
use hashbrown::hash_map;
#[cfg(feature = "std")]
use std::collections::hash_map;
#[derive(Debug)]
pub enum SharedDeserializeMapError {
DuplicateSharedPointer(*const u8),
}
unsafe impl Send for SharedDeserializeMapError {}
unsafe impl Sync for SharedDeserializeMapError {}
impl fmt::Display for SharedDeserializeMapError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::DuplicateSharedPointer(p) => write!(f, "duplicate shared pointer: {:p}", p),
}
}
}
#[cfg(feature = "std")]
const _: () = {
use std::error::Error;
impl Error for SharedDeserializeMapError {}
};
pub struct SharedDeserializeMap {
shared_pointers: hash_map::HashMap<*const u8, Box<dyn SharedPointer>>,
}
impl SharedDeserializeMap {
#[inline]
pub fn new() -> Self {
Self {
shared_pointers: hash_map::HashMap::new(),
}
}
}
impl fmt::Debug for SharedDeserializeMap {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_map()
.entries(
self.shared_pointers
.iter()
.map(|(s, p)| (s, &**p as *const _)),
)
.finish()
}
}
impl Default for SharedDeserializeMap {
#[inline]
fn default() -> Self {
Self::new()
}
}
impl Fallible for SharedDeserializeMap {
type Error = SharedDeserializeMapError;
}
impl SharedDeserializeRegistry for SharedDeserializeMap {
fn get_shared_ptr(&mut self, ptr: *const u8) -> Option<&dyn SharedPointer> {
self.shared_pointers.get(&ptr).map(|p| p.as_ref())
}
fn add_shared_ptr(
&mut self,
ptr: *const u8,
shared: Box<dyn SharedPointer>,
) -> Result<(), Self::Error> {
match self.shared_pointers.entry(ptr) {
hash_map::Entry::Occupied(_) => {
Err(SharedDeserializeMapError::DuplicateSharedPointer(ptr))
}
hash_map::Entry::Vacant(e) => {
e.insert(shared);
Ok(())
}
}
}
}