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use crate::node::Node;
use crate::node::{insert,delete,search, min_pair, max_pair};
use crate::iterators::RangePairIter;
use std::collections::Bound;
pub struct AVLTree<K:Ord+Copy,D> {
pub root: Option<Box<Node<K,D>>>
}
impl <K:Ord+Copy,D> AVLTree<K,D>{
/// This function will construct a new empty AVLTree.
/// # Examples
/// ```
/// extern crate avl_tree;
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// ```
pub fn new() -> AVLTree<K,D>{
AVLTree{root: None}
}
/// This function will insert the key,value pair into the tree, overwriting the old data if the key is allready
/// part of the tree.
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// t.insert(2,25);
/// assert_eq!(t.get(2), Some(&25));
/// t.insert(2,30);
/// assert_eq!(t.get(2), Some(&30));
/// ```
pub fn insert(&mut self, key: K, data: D) {
match self.root.take() {
Some(box_to_node) => self.root = Some(insert::<K,D>(key, data, box_to_node)),
None => self.root = Some(Box::new(Node::new(key,data))),
}
}
/// This function will remove the key,value pair from the tree, doing nothing if the key is not
/// part of the tree.
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// t.insert(2,25);
/// t.delete(2);
/// assert!(t.empty());
/// t.delete(3);
/// assert!(t.empty());
/// ```
pub fn delete(&mut self, key: K){
match self.root.take() {
Some(box_to_node) => self.root = delete(key,box_to_node),
None => return
}
}
/// This function will return the Some(data) stored under the given key or None if the key is not
/// known.
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// t.insert(2,25);
/// assert_eq!(t.get(2), Some(&25));
/// assert_eq!(t.get(3), None);
///
/// ```
pub fn get(&self, key: K) -> Option<&D>{
match self.root {
Some(ref box_to_node) =>search(&key, box_to_node),
None => None
}
}
/// This function will return the data stored under the given key or the default if the key is not
/// known.
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// t.insert(2,25);
/// assert_eq!(t.get_or(2,&2000), &25);
/// assert_eq!(t.get_or(3,&2000), &2000);
///
/// ```
pub fn get_or<'a>(&'a self, key: K, default: &'a D) -> &'a D{
self.get(key).map_or(default, |data| data)
}
/// This function will return true if the tree contains the given key, false otherwise
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// t.insert(2,25);
/// assert!(!t.contains(3));
/// assert!(t.contains(2));
///
/// ```
pub fn contains(&self, key: K) -> bool {
self.get(key).is_some()
}
/// This function will return true if the tree is empty, false otherwise.
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// assert!(t.empty());
/// t.insert(2,25);
/// assert!(!t.empty());
///
/// ```
pub fn empty(&self) -> bool { self.root.is_none() }
/// This function will return the key/value pair with the smallest key in the tree, or None if the
/// tree is empty.
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// t.insert(2,25);
/// t.insert(3,50);
/// assert_eq!(t.min().unwrap().0, &2);
/// assert_eq!(t.min().unwrap().1, &25);
///
/// ```
pub fn min<'a>(&'a self) -> Option<(&'a K,&'a D)> {
match self.root {
Some(ref root) => Some(min_pair(root)),
None => None
}
}
/// This function will return the key/value pair with the biggest key in the tree, or None if the
/// tree is empty.
/// # Examples
/// ```
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// t.insert(2,25);
/// t.insert(3,50);
/// assert_eq!(t.max().unwrap().0, &3);
/// assert_eq!(t.max().unwrap().1, &50);
///
/// ```
pub fn max<'a>(&'a self) -> Option<(&'a K,&'a D)> {
match self.root {
Some(ref root) => Some(max_pair(root)),
None => None
}
}
/// This function will return a read only iterator for all (key,value) pairs in the tree.
/// # Examples
/// ```
/// # let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// for (key,val) in t.iter() {
/// println!("{} -> {}",key,val)
/// }
///
/// ```
pub fn iter(&self) -> RangePairIter<K,D>{
RangePairIter::new(self, Bound::Unbounded, Bound::Unbounded)
}
/// This function will return a read only iterator for all (key,value) pairs between the two bounds (which can
/// be inclusive, exclusive or unbounded).
/// # Examples
/// ```
///
///
/// use std::collections::Bound;
/// //[...]
/// let mut t=avl_tree::AVLTree::<u64,i32>::new();
/// for (key,val) in t.range(Bound::Excluded(32), Bound::Excluded(38)) {
/// println!("{} -> {}",key,val)
/// }
///
/// ```
pub fn range(&self, min: Bound<K>, max: Bound<K>) -> RangePairIter<K,D>{
RangePairIter::new(self, min, max)
}
}
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