jubako 0.4.0

The reference implementation of the Jubako container format
Documentation 
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use super::builder::{AnyVariantBuilder, LazyEntryProperties, PropertyBuilderTrait};
use super::raw_value::RawValue;
use super::EntryTrait;
use crate::bases::*;
use crate::reader::ByteRegion;
use std::rc::Rc;

/// A lazy entry
pub struct LazyEntry {
    properties: Rc<LazyEntryProperties>,
    bytes: ByteRegion,
}

impl LazyEntry {
    pub(crate) fn new(properties: Rc<LazyEntryProperties>, bytes: ByteRegion) -> Self {
        Self { properties, bytes }
    }

    fn _get_value(&self, name: &str) -> Result<Option<RawValue>> {
        if self.properties.common.contains(name) {
            self.properties.common.create_value(name, &self.bytes)
        } else {
            self.properties
                .variant_part
                .as_ref()
                .and_then(
                    |AnyVariantBuilder {
                         variant_id_property,
                         variants,
                     }| {
                        let variant_id = match variant_id_property.create(&self.bytes) {
                            Ok(v) => v,
                            Err(e) => return Some(Err(e)),
                        };
                        if variants.len() <= variant_id.into_usize() {
                            None
                        } else {
                            let variant = &variants[variant_id.into_usize()];
                            variant.create_value(name, &self.bytes).transpose()
                        }
                    },
                )
                .transpose()
        }
    }
}

impl EntryTrait for LazyEntry {
    fn get_variant_id(&self) -> Result<Option<VariantIdx>> {
        match &self.properties.variant_part {
            None => Ok(None),
            Some(AnyVariantBuilder {
                variant_id_property,
                variants: _,
            }) => Ok(Some(variant_id_property.create(&self.bytes)?)),
        }
    }

    fn get_value(&self, name: impl AsRef<str>) -> Result<Option<RawValue>> {
        self._get_value(name.as_ref())
    }
}