fn update()

in src/memory.rs [151:172]
21 lines of code
2 McCabe index (conditional complexity)

    fn update(&mut self, location: &Path, v: UpdateVersion, entry: Entry) -> Result<()> {
        match self.map.get_mut(location) {
            // Return Precondition instead of NotFound for consistency with stores
            None => Err(crate::Error::Precondition {
                path: location.to_string(),
                source: format!("Object at location {location} not found").into(),
            }),
            Some(e) => {
                let existing = e.e_tag.to_string();
                let expected = v.e_tag.ok_or(Error::MissingETag)?;
                if existing == expected {
                    *e = entry;
                    Ok(())
                } else {
                    Err(crate::Error::Precondition {
                        path: location.to_string(),
                        source: format!("{existing} does not match {expected}").into(),
                    })
                }
            }
        }
    }