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use crate::pearl::Pearl;
use std::{
collections::{HashMap, hash_map::IntoIter},
hash::Hash,
};
#[derive(Debug)]
pub struct Oyster<K, V>(pub(crate) HashMap<K, Pearl<V>>)
where
K: Hash + Ord + Clone + Send + ToString + From<String>,
V: Clone + Send + ToString + From<String>;
impl<K, V> Default for Oyster<K, V>
where
K: Hash + Ord + Clone + Send + ToString + From<String>,
V: Clone + Send + ToString + From<String>,
{
fn default() -> Self {
Self::new()
}
}
impl<K, V> Oyster<K, V>
where
K: Hash + Ord + Clone + Send + ToString + From<String>,
V: Clone + Send + ToString + From<String>,
{
/// Create a new [`Oyster`].
pub fn new() -> Self {
Self(HashMap::default())
}
/// Insert a value given its `key` and `value`.
///
/// # Arguments
/// * `key` - the key to store the value in
/// * `value` - the actual value
pub fn insert(&mut self, key: K, value: V) -> Option<Pearl<V>> {
self.0.insert(key, Pearl::new(value))
}
/// Insert a value given its `key` and `value`.
///
/// # Arguments
/// * `key` - the key to store the value in
/// * `value` - the actual value (as [`Pearl<V>`])
pub fn insert_full(&mut self, key: K, value: Pearl<V>) -> Option<Pearl<V>> {
self.0.insert(key, value)
}
/// Increment the value of a key.
///
/// # Arguments
/// * `key` - the key to store the value in
pub fn incr(&mut self, key: K) -> Option<Pearl<V>> {
let value = self.get(&key)?.to_string().parse::<usize>().unwrap();
self.insert(key, (value + 1).to_string().into())
}
/// Decrement the value of a key.
///
/// # Arguments
/// * `key` - the key to store the value in
pub fn decr(&mut self, key: K) -> Option<Pearl<V>> {
let mut value = self.get(&key)?.to_string().parse::<usize>().unwrap();
if value == 0 {
value += 1; // this will make the value just end up as 0
}
self.insert(key, (value - 1).to_string().into())
}
/// Get a value given its `key`.
///
/// # Arguments
/// * `key` - the key the value is stored in
pub fn get(&self, key: &K) -> Option<&V> {
if let Some(v) = self.0.get(key) {
Some(&v.0)
} else {
None
}
}
/// Get a full [`Pearl`] given its `key`.
///
/// # Arguments
/// * `key` - the key the value is stored in
pub fn get_full(&self, key: &K) -> Option<&Pearl<V>> {
self.0.get(key)
}
/// Get all items where their key starts with the given `prefix`.
///
/// # Arguments
/// * `prefix` - the prefix to match keys against
pub fn starting_with(&self, prefix: &str) -> Vec<(&K, &Pearl<V>)> {
let matches = self
.0
.iter()
.filter(|x| x.0.to_string().starts_with(prefix));
matches.collect()
}
/// Get all items where their key ends with the given `prefix`.
///
/// # Arguments
/// * `suffix` - the suffix to match keys against
pub fn ending_with(&self, suffix: &str) -> Vec<(&K, &Pearl<V>)> {
let matches = self.0.iter().filter(|x| x.0.to_string().ends_with(suffix));
matches.collect()
}
/// Selects either [`Self::starting_with`] or [`Self::ending_with`], depending on if the given
/// pattern string ends with `*`, or begins with `*` (respectively).
///
/// # Arguments
/// * `pattern` - the pattern to match keys against
pub fn filter(&self, pattern: &str) -> Vec<(&K, &Pearl<V>)> {
let pat = &pattern.replace("*", "");
if pattern.starts_with("*") {
self.ending_with(pat)
} else {
self.starting_with(pat)
}
}
/// Get all keys which start with the given `prefix`.
///
/// # Arguments
/// * `prefix` - the prefix to match keys against
pub fn starting_with_keys(&self, prefix: &str) -> Vec<&K> {
let matches = self.0.keys().filter(|x| x.to_string().starts_with(prefix));
matches.collect()
}
/// Get all keys which end with the given `prefix`.
///
/// # Arguments
/// * `suffix` - the suffix to match keys against
pub fn ending_with_keys(&self, suffix: &str) -> Vec<&K> {
let matches = self.0.keys().filter(|x| x.to_string().ends_with(suffix));
matches.collect()
}
/// Selects either [`Self::starting_with_keys`] or [`Self::ending_with_keys`], depending on if the given
/// pattern string ends with `*`, or begins with `*` (respectively).
///
/// # Arguments
/// * `pattern` - the suffix to match keys against
pub fn filter_keys(&self, pattern: &str) -> Vec<&K> {
let pat = &pattern.replace("*", "");
if pattern.starts_with("*") {
self.ending_with_keys(pat)
} else {
self.starting_with_keys(pat)
}
}
/// Remove a value given its `key`.
///
/// # Arguments
/// * `key` - the key the value is stored in
pub fn remove(&mut self, key: &K) -> Option<Pearl<V>> {
self.0.remove(key)
}
}
impl<K, V> IntoIterator for Oyster<K, V>
where
K: Hash + Ord + Clone + Send + ToString + From<String>,
V: Clone + Send + ToString + From<String>,
{
type Item = (K, Pearl<V>);
type IntoIter = IntoIter<K, Pearl<V>>;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}