use std::collections::HashMap;
use std::hash::Hash;
use super::inner_value::InnerValue;
pub struct HashMapMut<K, V> {
data: InnerValue<HashMap<K, V>>,
}
impl<K: Eq + Hash, V> Default for HashMapMut<K, V> {
fn default() -> Self {
Self::new()
}
}
impl<K: Eq + Hash, V> HashMapMut<K, V> {
pub fn new() -> HashMapMut<K, V> {
HashMapMut {
data: InnerValue::new(HashMap::new()),
}
}
pub fn insert(&self, key: K, value: V) -> Option<V> {
let state = self.data.get_mut();
state.insert(key, value)
}
pub fn get_and_map<R, F: FnOnce(&V) -> R>(&self, key: &K, callback: F) -> Option<R> {
let state = self.data.get();
let item = state.get(key);
if let Some(elem) = item {
return Some(callback(elem));
}
None
}
pub fn must_change<R, F: FnOnce(&mut V) -> R>(&self, key: &K, callback: F) -> Option<R> {
let state = self.data.get_mut();
let item = state.get_mut(key);
if let Some(elem) = item {
return Some(callback(elem));
}
None
}
pub fn remove(&self, key: &K) -> Option<V> {
let state = self.data.get_mut();
state.remove(key)
}
pub fn mem_replace(&self, new_map: HashMap<K, V>) -> HashMap<K, V> {
let state = self.data.get_mut();
std::mem::replace(state, new_map)
}
pub fn retain<F: FnMut(&K, &mut V) -> bool>(&self, f: F) {
let state = self.data.get_mut();
state.retain(f)
}
pub fn filter_and_map<R>(&self, map: fn(&V) -> Option<R>) -> Vec<R> {
let state = self.data.get();
let mut list = Vec::new();
for (_, value) in (*state).iter() {
if let Some(mapped) = map(value) {
list.push(mapped);
}
}
list
}
}
impl<K: Eq + Hash, V: Clone> HashMapMut<K, V> {
pub fn get_all_values(&self) -> Vec<V> {
let state = self.data.get();
let mut out = Vec::new();
for (_, callback) in state.iter() {
out.push((*callback).clone());
}
out
}
pub fn get(&self, key: &K) -> Option<V> {
let state = self.data.get();
state.get(key).map(|value| (*value).clone())
}
}
impl<K: Eq + Hash, V: PartialEq> HashMapMut<K, V> {
pub fn insert_and_check(&self, key: K, value: V) -> bool {
let state = self.data.get_mut();
let is_change = state.get(&key) != Some(&value);
state.insert(key, value);
is_change
}
}