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#![allow(clippy::type_complexity)] use std::collections::{HashMap, HashSet}; use std::error::Error; use std::fmt::{self, Debug, Display, Formatter}; use std::hash::Hash; use std::sync::Arc; /// A structure to separate values into different levels with keys. Every key-value entry which is not at the top level has a parent key at the superior level. Keys at the same level are unique, no matter what parent keys they have. #[derive(Debug)] pub struct LeveledHashMap<K: Eq + Hash, V> { pool: Vec<HashMap<Arc<K>, (Option<Arc<K>>, V)>>, sub: Vec<HashMap<Arc<K>, HashSet<Arc<K>>>>, } /// Possible errors come from `LeveledHashMap`. pub enum LeveledHashMapError<K> { /// The length of a key chain is over the max level of a `LeveledHashMap`. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::{LeveledHashMap, LeveledHashMapError}; /// /// let mut map = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], 100).unwrap(); /// /// // now the map has "Level 0", "Level 0" is available to be got, "Level 0" and "Level 1" are available to be inserted /// /// assert_eq!(&100, map.get_advanced(&[Arc::new("food")], 0).unwrap()); /// /// // try to get value at "Level 1" /// /// match map.get_professional(&[Arc::new("food"), Arc::new("dessert")], 0) { /// Ok(_) => unreachable!(), /// Err(err) => match err { /// LeveledHashMapError::KeyTooMany => (), /// _ => unreachable!() /// } /// } /// /// // try to insert value to "Level 2" /// /// match map.insert(&[Arc::new("food"), Arc::new("dessert"), Arc::new("cake")], 10) { /// Ok(_) => unreachable!(), /// Err(err) => match err { /// LeveledHashMapError::KeyTooMany => (), /// _ => unreachable!() /// } /// } /// /// // try to insert value to "Level 1" /// /// match map.insert(&[Arc::new("food"), Arc::new("dessert")], 10) { /// Ok(_) => (), /// Err(err) => unreachable!() /// } /// ``` KeyTooMany, /// The key chain is correct, but the last key in the key chain does not exist. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::{LeveledHashMap, LeveledHashMapError}; /// /// let mut map = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], 100).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert")], 100).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert"), Arc::new("cake")], 100).unwrap(); /// /// // try to get "food/dessert/chocolate" /// /// match map.get_professional(&[Arc::new("food"), Arc::new("dessert"), Arc::new("chocolate")], 0) { /// Ok(_) => unreachable!(), /// Err(err) => { /// match err { /// LeveledHashMapError::KeyNotExist { /// level, /// key, /// } => { /// assert_eq!(2, level); /// assert_eq!(Arc::new("chocolate"), key); /// } /// _ => unreachable!(), /// } /// } /// } /// ``` KeyNotExist { level: usize, key: Arc<K>, }, /// The key chain is empty. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::{LeveledHashMap, LeveledHashMapError}; /// /// let mut map = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], 100).unwrap(); /// /// // try to get "" /// /// match map.get_professional(&[], 0) { /// Ok(_) => unreachable!(), /// Err(err) => { /// match err { /// LeveledHashMapError::KeyChainEmpty => (), /// _ => unreachable!(), /// } /// } /// } /// ``` KeyChainEmpty, /// The key chain is incorrect. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::{LeveledHashMap, LeveledHashMapError}; /// /// let mut map = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], 100).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("meat")], 200).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert")], 100).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert"), Arc::new("cake")], 100).unwrap(); /// /// // try to get "food/meat/chocolate", here "food/meat" exists /// /// match map.get_professional(&[Arc::new("food"), Arc::new("meat"), Arc::new("cake")], 0) { /// Ok(_) => unreachable!(), /// Err(err) => { /// match err { /// LeveledHashMapError::KeyChainIncorrect { /// level, /// key, /// last_key, /// } => { /// assert_eq!(2, level); /// assert_eq!(Arc::new("cake"), key); /// assert_eq!(Some(Arc::new("dessert")), last_key); /// } /// _ => unreachable!(), /// } /// } /// } /// ``` KeyChainIncorrect { level: usize, key: Arc<K>, last_key: Option<Arc<K>>, }, } impl<K> Debug for LeveledHashMapError<K> { #[inline] fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> { match self { LeveledHashMapError::KeyTooMany => f.write_str("KeyTooMany"), LeveledHashMapError::KeyNotExist { level, .. } => { let mut s = f.debug_struct("KeyNotExist"); s.field("Level", level); s.finish() } LeveledHashMapError::KeyChainEmpty => f.write_str("KeyChainEmpty"), LeveledHashMapError::KeyChainIncorrect { level, .. } => { let mut s = f.debug_struct("KeyChainIncorrect"); s.field("Level", level); s.finish() } } } } impl<K> Display for LeveledHashMapError<K> { #[inline] fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> { match self { LeveledHashMapError::KeyTooMany => { f.write_str("The length of a key chain is over the max level of a `LeveledHashMap`.") } LeveledHashMapError::KeyNotExist { level, .. } => { f.write_fmt(format_args!("The key chain is correct, but the last key at level {} in the key chain does not exist.", level)) } LeveledHashMapError::KeyChainEmpty => { f.write_str("The key chain is empty.") } LeveledHashMapError::KeyChainIncorrect { level, .. } => { f.write_fmt(format_args!("The key chain is incorrect at level {}.", level)) } } } } impl<K> Error for LeveledHashMapError<K> {} impl<K: Eq + Hash, V> LeveledHashMap<K, V> { /// Create a new `LeveledHashMap` instance. The key needs to be implemented `Eq` and `Hash` traits. /// ``` /// extern crate leveled_hash_map; /// /// use leveled_hash_map::LeveledHashMap; /// /// let _map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// ``` #[inline] pub fn new() -> LeveledHashMap<K, V> { LeveledHashMap { pool: Vec::new(), sub: Vec::new(), } } /// Get a value by a key chain. The key chain starts at Level 0. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// let _result = map.get(&[Arc::new("first_key")]); /// ``` #[inline] pub fn get(&self, key_chain: &[Arc<K>]) -> Option<&V> { self.get_advanced(key_chain, 0) } /// Get a value by a key chain. The key chain starts at Level 0. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// let _result = map.get_mut(&[Arc::new("first_key")]); /// ``` #[inline] pub fn get_mut(&mut self, key_chain: &[Arc<K>]) -> Option<&mut V> { self.get_advanced_mut(key_chain, 0) } /// Get a value by a key chain and a level which the key chain starts with. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// let _result = map.get_advanced(&[Arc::new("second_key")], 1); /// ``` #[inline] pub fn get_advanced(&self, key_chain: &[Arc<K>], start_level: usize) -> Option<&V> { self.get_professional(key_chain, start_level).ok().map(|v| v.1) } /// Get a value by a key chain and a level which the key chain starts with. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// let _result = map.get_advanced_mut(&[Arc::new("second_key")], 1); /// ``` #[inline] pub fn get_advanced_mut(&mut self, key_chain: &[Arc<K>], start_level: usize) -> Option<&mut V> { self.get_professional_mut(key_chain, start_level).ok().map(|v| v.1) } /// Get a value and its parent key by a key chain and a level which the key chain starts with. It returns a `Err(LeveledHashMapError)` instance to describe the reason of the getting failure. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert")], "甜點".to_string()).unwrap(); /// /// let result_1 = map.get_professional(&[Arc::new("food")], 0).unwrap(); /// /// let result_2 = map.get_professional(&[Arc::new("food"), Arc::new("dessert")], 0).unwrap(); /// /// assert_eq!(None, result_1.0); /// assert_eq!("食物", result_1.1); /// /// assert_eq!(Some(Arc::new("food")), result_2.0); /// assert_eq!("甜點", result_2.1); /// ``` pub fn get_professional( &self, key_chain: &[Arc<K>], start_level: usize, ) -> Result<(Option<Arc<K>>, &V), LeveledHashMapError<K>> { let key_chain_len = key_chain.len(); if key_chain_len == 0 { return Err(LeveledHashMapError::KeyChainEmpty); } else if key_chain_len + start_level > self.pool.len() { return Err(LeveledHashMapError::KeyTooMany); } let key_chain_len_dec = key_chain_len - 1; let mut i = 0; let mut last_key = None; while i < key_chain_len_dec { let ii = i + start_level; let ck = &key_chain[i]; match self.pool[ii].get(ck) { Some((pk, _)) => { if ii > start_level && last_key.ne(&pk.as_ref()) { return Err(LeveledHashMapError::KeyChainIncorrect { level: ii, key: Arc::clone(ck), last_key: pk.as_ref().map(|v| Arc::clone(v)), }); } last_key = Some(&ck); } None => { return Err(LeveledHashMapError::KeyNotExist { level: ii, key: Arc::clone(ck), }) } } i += 1; } let ck = &key_chain[key_chain_len_dec]; let ii = key_chain_len_dec + start_level; match self.pool[ii].get(ck) { Some((pk, v)) => { if ii > start_level && last_key.ne(&pk.as_ref()) { return Err(LeveledHashMapError::KeyChainIncorrect { level: ii, key: Arc::clone(ck), last_key: pk.as_ref().map(|v| Arc::clone(v)), }); } let pk = pk.as_ref().map(|v| Arc::clone(v)); Ok((pk, v)) } None => { Err(LeveledHashMapError::KeyNotExist { level: ii, key: Arc::clone(ck), }) } } } /// Get a value and its parent key by a key chain and a level which the key chain starts with. It returns a `Err(LeveledHashMapError)` instance to describe the reason of the getting failure. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert")], "甜點".to_string()).unwrap(); /// /// let result = map.get_professional_mut(&[Arc::new("food")], 0).unwrap(); /// /// result.1.push_str("/食品"); /// /// assert_eq!(None, result.0); /// assert_eq!("食物/食品", result.1); /// ``` pub fn get_professional_mut( &mut self, key_chain: &[Arc<K>], start_level: usize, ) -> Result<(Option<Arc<K>>, &mut V), LeveledHashMapError<K>> { let key_chain_len = key_chain.len(); if key_chain_len == 0 { return Err(LeveledHashMapError::KeyChainEmpty); } else if key_chain_len + start_level > self.pool.len() { return Err(LeveledHashMapError::KeyTooMany); } let key_chain_len_dec = key_chain_len - 1; let mut i = 0; let mut last_key = None; while i < key_chain_len_dec { let ii = i + start_level; let ck = &key_chain[i]; match self.pool[ii].get(ck) { Some((pk, _)) => { if ii > start_level && last_key.ne(&pk.as_ref()) { return Err(LeveledHashMapError::KeyChainIncorrect { level: ii, key: Arc::clone(ck), last_key: pk.as_ref().map(|v| Arc::clone(v)), }); } last_key = Some(&ck); } None => { return Err(LeveledHashMapError::KeyNotExist { level: ii, key: Arc::clone(ck), }) } } i += 1; } let ck = &key_chain[key_chain_len_dec]; let ii = key_chain_len_dec + start_level; match self.pool[ii].get_mut(ck) { Some((pk, v)) => { if ii > start_level && last_key.ne(&pk.as_ref()) { return Err(LeveledHashMapError::KeyChainIncorrect { level: ii, key: Arc::clone(ck), last_key: pk.as_ref().map(|v| Arc::clone(v)), }); } let pk = pk.as_ref().map(|v| Arc::clone(v)); Ok((pk, v)) } None => { Err(LeveledHashMapError::KeyNotExist { level: ii, key: Arc::clone(ck), }) } } } /// Remove a value by a key chain. The key chain starts at Level 0. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert")], "甜點".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("meat")], "肉類".to_string()).unwrap(); /// /// let result = map.remove(&[Arc::new("food"), Arc::new("dessert")]).unwrap(); /// /// assert_eq!("甜點", result.0); /// assert_eq!(0, result.1.len()); /// /// let result = map.remove(&[Arc::new("food")]).unwrap(); /// /// assert_eq!("食物", result.0); /// assert_eq!(1, result.1.len()); /// assert_eq!( /// &(Some(Arc::new("food")), "肉類".to_string()), /// result.1[0].get(&Arc::new("meat")).unwrap() /// ); /// ``` #[inline] pub fn remove( &mut self, key_chain: &[Arc<K>], ) -> Option<(V, Vec<HashMap<Arc<K>, (Option<Arc<K>>, V)>>)> { self.remove_advanced(key_chain, 0) } /// Remove a value by a key chain and a level which the key chain starts with. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert")], "甜點".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("meat")], "肉類".to_string()).unwrap(); /// /// let result = map.remove_advanced(&[Arc::new("dessert")], 1).unwrap(); /// /// assert_eq!("甜點", result.0); /// assert_eq!(0, result.1.len()); /// /// let result = map.remove_advanced(&[Arc::new("food")], 0).unwrap(); /// /// assert_eq!("食物", result.0); /// assert_eq!(1, result.1.len()); /// assert_eq!( /// &(Some(Arc::new("food")), "肉類".to_string()), /// result.1[0].get(&Arc::new("meat")).unwrap() /// ); /// ``` #[inline] pub fn remove_advanced( &mut self, key_chain: &[Arc<K>], start_level: usize, ) -> Option<(V, Vec<HashMap<Arc<K>, (Option<Arc<K>>, V)>>)> { self.remove_professional(key_chain, start_level).ok().map(|v| (v.1, v.2)) } /// Remove a value by a key chain and a level which the key chain starts with. It returns a `Err(LeveledHashMapError)` instance to describe the reason of the getting failure. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("dessert")], "甜點".to_string()).unwrap(); /// /// map.insert(&[Arc::new("food"), Arc::new("meat")], "肉類".to_string()).unwrap(); /// /// let result = map.remove_professional(&[Arc::new("dessert")], 1).unwrap(); /// /// assert_eq!(Some(Arc::new("food")), result.0); /// assert_eq!("甜點", result.1); /// assert_eq!(0, result.2.len()); /// /// let result = map.remove_professional(&[Arc::new("food")], 0).unwrap(); /// /// assert_eq!(None, result.0); /// assert_eq!("食物", result.1); /// assert_eq!(1, result.2.len()); /// assert_eq!( /// &(Some(Arc::new("food")), "肉類".to_string()), /// result.2[0].get(&Arc::new("meat")).unwrap() /// ); /// ``` pub fn remove_professional( &mut self, key_chain: &[Arc<K>], start_level: usize, ) -> Result< (Option<Arc<K>>, V, Vec<HashMap<Arc<K>, (Option<Arc<K>>, V)>>), LeveledHashMapError<K>, > { let last_key = self.get_professional(key_chain, start_level)?.0; let key_chain_len = key_chain.len(); let key_chain_len_dec = key_chain_len - 1; let level = key_chain_len_dec + start_level; let (pk, v) = self.pool[level].remove(&key_chain[key_chain_len_dec]).unwrap(); if level > 0 { if let Some(v) = self.sub[level - 1].get_mut(&last_key.unwrap()) { v.remove(&key_chain[key_chain_len_dec]); } } let sub = self.sub[level].remove(&key_chain[key_chain_len_dec]).unwrap(); if sub.is_empty() { return Ok((pk, v, Vec::new())); } let mut sub_values: Vec<HashMap<Arc<K>, (Option<Arc<K>>, V)>> = Vec::new(); let mut my_sub_values = HashMap::new(); for s in sub { let (a, b, mut c) = self.remove_professional(&[Arc::clone(&s)], level + 1).unwrap(); let len = c.len(); sub_values.reserve(len); c.reverse(); for i in (0..len).rev() { if let Some(h) = sub_values.get_mut(i) { for (k, v) in c.remove(i) { h.insert(k, v); } continue; } sub_values.push(c.remove(i)); } my_sub_values.insert(s, (a, b)); } sub_values.insert(0, my_sub_values); Ok((pk, v, sub_values)) } /// Insert a value by a key chain. It returns a `Err(LeveledHashMapError)` instance to describe the reason of the getting failure. /// ``` /// extern crate leveled_hash_map; /// /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// { /// let result = map.get(&[Arc::new("food")]).unwrap(); /// /// assert_eq!("食物", result); /// } /// /// let result = map.insert(&[Arc::new("food")], "食品".to_string()).unwrap(); /// /// assert_eq!(Some("食物".to_string()), result); /// /// let result = map.get(&[Arc::new("food")]).unwrap(); /// /// assert_eq!("食品", result); /// ``` pub fn insert( &mut self, key_chain: &[Arc<K>], value: V, ) -> Result<Option<V>, LeveledHashMapError<K>> { let key_chain_len = key_chain.len(); if key_chain_len == 0 { return Err(LeveledHashMapError::KeyChainEmpty); } let key_chain_len_dec = key_chain_len - 1; if key_chain_len_dec > self.pool.len() { return Err(LeveledHashMapError::KeyTooMany); } match self.get_professional(key_chain, 0) { Ok(_) => { if key_chain_len_dec > 0 { Ok(self.pool[key_chain_len_dec] .insert( Arc::clone(&key_chain[key_chain_len_dec]), (Some(Arc::clone(&key_chain[key_chain_len_dec - 1])), value), ) .map(|v| v.1)) } else { Ok(self.pool[0].insert(Arc::clone(&key_chain[0]), (None, value)).map(|v| v.1)) } } Err(err) => { match err { LeveledHashMapError::KeyChainEmpty => Err(LeveledHashMapError::KeyChainEmpty), LeveledHashMapError::KeyTooMany => { if self.pool.is_empty() { let mut map = HashMap::new(); map.insert(Arc::clone(&key_chain[0]), (None, value)); self.pool.push(map); let mut map = HashMap::new(); map.insert(Arc::clone(&key_chain[0]), HashSet::new()); self.sub.push(map); Ok(None) } else { let mut map = HashMap::new(); map.insert( Arc::clone(&key_chain[key_chain_len_dec]), (Some(Arc::clone(&key_chain[key_chain_len_dec - 1])), value), ); self.pool.push(map); let mut map = HashMap::new(); map.insert(Arc::clone(&key_chain[key_chain_len_dec]), HashSet::new()); self.sub.push(map); let map = self.sub[key_chain_len_dec - 1] .get_mut(&key_chain[key_chain_len_dec - 1]) .unwrap(); map.insert(Arc::clone(&key_chain[key_chain_len_dec])); Ok(None) } } LeveledHashMapError::KeyChainIncorrect { level, key, last_key, } => { Err(LeveledHashMapError::KeyChainIncorrect { level, key, last_key, }) } LeveledHashMapError::KeyNotExist { level, key, } => { self.sub[level] .insert(Arc::clone(&key_chain[key_chain_len_dec]), HashSet::new()); if level > 0 { self.pool[level].insert( key, (Some(Arc::clone(&key_chain[key_chain_len_dec - 1])), value), ); self.sub[level - 1] .get_mut(&key_chain[key_chain_len_dec - 1]) .unwrap() .insert(Arc::clone(&key_chain[key_chain_len_dec])); } else { self.pool[level].insert(key, (None, value)); } Ok(None) } } } } } /// Insert values by a key chain and a `HashMap` instance and a level which the key chain starts with. It returns a `Err(LeveledHashMapError)` instance to describe the reason of the getting failure. /// ``` /// extern crate leveled_hash_map; /// /// use std::collections::HashMap; /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// let mut insert_map = HashMap::new(); /// /// insert_map.insert("dessert", "甜點".to_string()); /// insert_map.insert("meat", "肉類".to_string()); /// /// map.insert_many(&[Arc::new("food")], insert_map, 0).unwrap(); /// /// let result = map.get(&[Arc::new("food"), Arc::new("dessert")]).unwrap(); /// /// assert_eq!("甜點", result); /// /// let result = map.get(&[Arc::new("food"), Arc::new("meat")]).unwrap(); /// /// assert_eq!("肉類", result); /// ``` pub fn insert_many( &mut self, key_chain: &[Arc<K>], value: HashMap<K, V>, start_level: usize, ) -> Result<HashMap<Arc<K>, V>, LeveledHashMapError<K>> { let key_chain_len = key_chain.len(); if key_chain_len > self.pool.len() + 1 { return Err(LeveledHashMapError::KeyTooMany); } match self.get_professional(key_chain, start_level) { Ok(_) => { let key_chain_len_dec = key_chain_len - 1; let mut previous = HashMap::new(); let level = key_chain_len + start_level; if level >= self.pool.len() { self.pool.push(HashMap::new()); self.sub.push(HashMap::new()); } let last_key = &key_chain[key_chain_len_dec]; let mut temp = HashMap::new(); for (k, v) in value { let k = Arc::new(k); if let Some((pk, _)) = self.pool[level].get(&Arc::clone(&k)) { if last_key.ne(&pk.as_ref().unwrap()) { return Err(LeveledHashMapError::KeyChainIncorrect { level, key: Arc::clone(&k), last_key: pk.as_ref().map(|v| Arc::clone(v)), }); } } temp.insert(k, v); } for (k, v) in temp { match self.pool[level].insert(Arc::clone(&k), (Some(Arc::clone(last_key)), v)) { Some((_, v)) => { previous.insert(k, v); } None => { self.sub[level].insert(Arc::clone(&k), HashSet::new()); self.sub[level - 1].get_mut(last_key).unwrap().insert(Arc::clone(&k)); } } } Ok(previous) } Err(err) => { match err { LeveledHashMapError::KeyChainIncorrect { level, key, last_key, } => { Err(LeveledHashMapError::KeyChainIncorrect { level, key, last_key, }) } LeveledHashMapError::KeyNotExist { level, key, } => { Err(LeveledHashMapError::KeyNotExist { level, key, }) } LeveledHashMapError::KeyTooMany => Err(LeveledHashMapError::KeyTooMany), LeveledHashMapError::KeyChainEmpty => { if start_level > 0 { return Err(LeveledHashMapError::KeyChainEmpty); } if self.pool.is_empty() { self.pool.push(HashMap::new()); self.sub.push(HashMap::new()); } let mut previous = HashMap::new(); for (k, v) in value { let k = Arc::new(k); match self.pool[0].insert(Arc::clone(&k), (None, v)) { Some((_, v)) => { previous.insert(k, v); } None => { self.sub[0].insert(Arc::clone(&k), HashSet::new()); } } } Ok(previous) } } } } } /// Get the keys at a specific level. /// ``` /// extern crate leveled_hash_map; /// /// use std::collections::HashMap; /// use std::sync::Arc; /// /// use leveled_hash_map::LeveledHashMap; /// /// let mut map: LeveledHashMap<&'static str, String> = LeveledHashMap::new(); /// /// map.insert(&[Arc::new("food")], "食物".to_string()).unwrap(); /// /// let mut insert_map = HashMap::new(); /// /// insert_map.insert("dessert", "甜點".to_string()); /// insert_map.insert("meat", "肉類".to_string()); /// /// map.insert_many(&[Arc::new("food")], insert_map, 0).unwrap(); /// /// let result = map.keys(0).unwrap(); /// /// assert_eq!(1, result.len()); /// /// let result = map.keys(1).unwrap(); /// /// assert_eq!(2, result.len()); /// ``` #[inline] pub fn keys(&self, level: usize) -> Option<&HashMap<Arc<K>, HashSet<Arc<K>>>> { match self.sub.get(level) { Some(v) => Some(&v), None => None, } } } impl<K: Eq + Hash, V> Default for LeveledHashMap<K, V> { #[inline] fn default() -> Self { LeveledHashMap::new() } }