meld 1.1.5

Deterministic filesystem state management using Merkle trees
Documentation 
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//! Node metadata domain type.

use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::ops::{Deref, DerefMut};

/// Node metadata contract type.
#[derive(Debug, Clone, Default, Serialize, Deserialize, PartialEq, Eq)]
#[serde(transparent)]
pub struct NodeMetadata(HashMap<String, String>);

impl NodeMetadata {
    pub fn new() -> Self {
        Self(HashMap::new())
    }
}

impl From<HashMap<String, String>> for NodeMetadata {
    fn from(value: HashMap<String, String>) -> Self {
        Self(value)
    }
}

impl From<NodeMetadata> for HashMap<String, String> {
    fn from(value: NodeMetadata) -> Self {
        value.0
    }
}

impl FromIterator<(String, String)> for NodeMetadata {
    fn from_iter<T: IntoIterator<Item = (String, String)>>(iter: T) -> Self {
        Self(iter.into_iter().collect())
    }
}

impl Deref for NodeMetadata {
    type Target = HashMap<String, String>;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl DerefMut for NodeMetadata {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

impl IntoIterator for NodeMetadata {
    type Item = (String, String);
    type IntoIter = std::collections::hash_map::IntoIter<String, String>;

    fn into_iter(self) -> Self::IntoIter {
        self.0.into_iter()
    }
}

impl<'a> IntoIterator for &'a NodeMetadata {
    type Item = (&'a String, &'a String);
    type IntoIter = std::collections::hash_map::Iter<'a, String, String>;

    fn into_iter(self) -> Self::IntoIter {
        self.0.iter()
    }
}

impl<'a> IntoIterator for &'a mut NodeMetadata {
    type Item = (&'a String, &'a mut String);
    type IntoIter = std::collections::hash_map::IterMut<'a, String, String>;

    fn into_iter(self) -> Self::IntoIter {
        self.0.iter_mut()
    }
}