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use crate::encodings::varint::encode_prefix_varint;
use crate::prelude::*;
use std::collections::HashMap;
use std::hash::{BuildHasher, Hash};
use std::vec::IntoIter;
#[cfg(feature = "write")]
impl<'a, K: Writable<'a>, V: Writable<'a>, S: Default + BuildHasher> Writable<'a> for HashMap<K, V, S> {
type WriterArray = HashMapArrayWriter<'a, K::WriterArray, V::WriterArray, S>;
fn write_root<'b: 'a>(&'b self, stream: &mut impl WriterStream) -> RootTypeId {
encode_prefix_varint(self.len() as u64, stream.bytes());
match self.len() {
0 => {}
1 => {
for key in self.keys() {
stream.write_with_id(|stream| key.write_root(stream));
}
for value in self.values() {
stream.write_with_id(|stream| value.write_root(stream));
}
}
_ => {
let mut keys_writer = K::WriterArray::default();
for key in self.keys() {
keys_writer.buffer(key);
}
stream.write_with_id(|stream| keys_writer.flush(stream));
let mut values_writer = V::WriterArray::default();
for value in self.values() {
values_writer.buffer(value);
}
stream.write_with_id(|stream| values_writer.flush(stream));
}
}
RootTypeId::Map
}
}
#[cfg(feature = "read")]
impl<K: Readable + Hash + Eq + Send, V: Readable + Send, S: Default + BuildHasher> Readable for HashMap<K, V, S> {
type ReaderArray = Option<HashMapArrayReader<K::ReaderArray, V::ReaderArray, S>>;
fn read(sticks: DynRootBranch<'_>, options: &impl DecodeOptions) -> ReadResult<Self> {
let mut v = Default::default();
match sticks {
DynRootBranch::Map0 => Ok(v),
DynRootBranch::Map1 { key, value } => {
let (key, value) = parallel(
move || K::read(*key, options),
move || V::read(*value, options),
options,
);
v.insert(key?, value?);
Ok(v)
}
DynRootBranch::Map { len, keys, values } => {
let (keys, values) = parallel(
|| K::ReaderArray::new(keys, options),
|| V::ReaderArray::new(values, options),
options,
);
let mut keys = keys?;
let mut values = values?;
for _ in 0..len {
v.insert(keys.read_next(), values.read_next());
}
Ok(v)
}
_ => Err(ReadError::SchemaMismatch),
}
}
}
#[cfg(feature = "write")]
#[derive(Debug, Default)]
pub struct HashMapArrayWriter<'a, K, V, S> {
len: <u64 as Writable<'a>>::WriterArray,
items: Option<(K, V)>,
_marker: Unowned<S>,
}
#[cfg(feature = "read")]
pub struct HashMapArrayReader<K, V, S> {
len: IntoIter<u64>,
keys: K,
values: V,
_marker: Unowned<S>,
}
#[cfg(feature = "write")]
impl<'a, K: WriterArray<'a>, V: WriterArray<'a>, S: Default + BuildHasher> WriterArray<'a> for HashMapArrayWriter<'a, K, V, S> {
type Write = HashMap<K::Write, V::Write, S>;
fn buffer<'b: 'a>(&mut self, value: &'b Self::Write) {
self.len.buffer(&(value.len() as u64));
let (keys, values) = self.items.get_or_insert_with(Default::default);
for (key, value) in value.iter() {
keys.buffer(key);
values.buffer(value);
}
}
fn flush(self, stream: &mut impl WriterStream) -> ArrayTypeId {
let Self { len, items, _marker } = self;
if let Some((keys, values)) = items {
stream.write_with_id(|stream| len.flush(stream));
stream.write_with_id(|stream| keys.flush(stream));
stream.write_with_id(|stream| values.flush(stream));
} else {
stream.write_with_id(|_| ArrayTypeId::Void);
}
ArrayTypeId::Map
}
}
#[cfg(feature = "read")]
impl<K: ReaderArray, V: ReaderArray, S: Default + BuildHasher> ReaderArray for Option<HashMapArrayReader<K, V, S>>
where
K::Read: Hash + Eq,
{
type Read = HashMap<K::Read, V::Read, S>;
fn new(sticks: DynArrayBranch<'_>, options: &impl DecodeOptions) -> ReadResult<Self> {
match sticks {
DynArrayBranch::Map0 => Ok(None),
DynArrayBranch::Map { len, keys, values } => {
let (keys, (values, len)) = parallel(
|| K::new(*keys, options),
|| parallel(
|| V::new(*values, options),
|| <<u64 as Readable>::ReaderArray as ReaderArray>::new(*len, options),
options,
),
options
);
let keys = keys?;
let values = values?;
let len = len?;
Ok(Some(HashMapArrayReader {
len,
keys,
values,
_marker: Unowned::new(),
}))
}
_ => Err(ReadError::SchemaMismatch),
}
}
fn read_next(&mut self) -> Self::Read {
if let Some(inner) = self {
let len = inner.len.read_next();
let mut result = <Self::Read as Default>::default();
for _ in 0..len {
let key = inner.keys.read_next();
let value = inner.values.read_next();
result.insert(key, value);
}
result
} else {
Default::default()
}
}
}