persy 1.8.0

Transactional Persistence Engine
Documentation 
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use crate::index::config::{
    IndexOrd, IndexTypeId, IndexTypeInternal, IndexTypeUnwrap, IndexTypeWrap, check_over_size_limit,
};
use std::{cmp::Ordering, fmt::Display, str::from_utf8, sync::Arc};

impl IndexTypeWrap for String {
    type Wrapper = StringWrapper;
    fn wrap(self) -> Self::Wrapper {
        StringWrapper::new(self)
    }
}

impl IndexTypeUnwrap for String {
    type Wrapped = String;
    fn unwrap(self) -> Self::Wrapped {
        self
    }
}

impl IndexTypeUnwrap for StringWrapper {
    type Wrapped = String;
    fn unwrap(self) -> Self::Wrapped {
        self.as_str().to_owned()
    }
}

#[derive(Clone, Debug)]
pub struct StringWrapper {
    value: Arc<Vec<u8>>,
    start: usize,
    size: usize,
}
impl PartialEq for StringWrapper {
    fn eq(&self, other: &Self) -> bool {
        IndexOrd::cmp(self, other) == Ordering::Equal
    }
}

impl StringWrapper {
    pub(crate) fn new(s: String) -> Self {
        let len = s.len();
        StringWrapper {
            value: Arc::new(s.into_bytes()),
            start: 0,
            size: len,
        }
    }
    pub(crate) fn new_slice(value: Arc<Vec<u8>>, start: usize, size: usize) -> Self {
        Self { value, start, size }
    }

    fn as_str(&self) -> &str {
        //TODO: check how to handle this unwrap
        from_utf8(&self.value[self.start..self.start + self.size]).unwrap()
    }

    pub(crate) fn slice(&self) -> &[u8] {
        &self.value[self.start..self.start + self.size]
    }

    pub(crate) fn len(&self) -> usize {
        self.size
    }
}

impl IndexTypeInternal for StringWrapper {
    fn get_id() -> u8 {
        12
    }
    fn get_type_id() -> crate::IndexTypeId {
        IndexTypeId::String
    }
    fn over_size_limit(&self) -> bool {
        check_over_size_limit(self.size)
    }
}

impl Display for StringWrapper {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.as_str())
    }
}

impl IndexOrd for StringWrapper {
    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
        self.slice().cmp(other.slice())
    }
}