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use crate::{B3Digest, NamedNode, ValidateNodeError};
/// A DirectoryNode is a pointer to a [Directory], by its [Directory::digest].
/// It also gives it a `name` and `size`.
/// Such a node is either an element in the [Directory] it itself is contained in,
/// or a standalone root node./
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DirectoryNode {
/// The (base)name of the directory
name: bytes::Bytes,
/// The blake3 hash of a Directory message, serialized in protobuf canonical form.
digest: B3Digest,
/// Number of child elements in the Directory referred to by `digest`.
/// Calculated by summing up the numbers of nodes, and for each directory.
/// its size field. Can be used for inode allocation.
/// This field is precisely as verifiable as any other Merkle tree edge.
/// Resolve `digest`, and you can compute it incrementally. Resolve the entire
/// tree, and you can fully compute it from scratch.
/// A credulous implementation won't reject an excessive size, but this is
/// harmless: you'll have some ordinals without nodes. Undersizing is obvious
/// and easy to reject: you won't have an ordinal for some nodes.
size: u64,
}
impl DirectoryNode {
pub fn new(name: bytes::Bytes, digest: B3Digest, size: u64) -> Result<Self, ValidateNodeError> {
Ok(Self { name, digest, size })
}
pub fn digest(&self) -> &B3Digest {
&self.digest
}
pub fn size(&self) -> u64 {
self.size
}
pub fn rename(self, name: bytes::Bytes) -> Self {
Self { name, ..self }
}
}
impl PartialOrd for DirectoryNode {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl Ord for DirectoryNode {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.get_name().cmp(other.get_name())
}
}
impl NamedNode for &DirectoryNode {
fn get_name(&self) -> &bytes::Bytes {
&self.name
}
}
impl NamedNode for DirectoryNode {
fn get_name(&self) -> &bytes::Bytes {
&self.name
}
}
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