mirror of
https://github.com/meilisearch/MeiliSearch
synced 2024-06-16 01:29:51 +02:00
106 lines
3.1 KiB
Rust
106 lines
3.1 KiB
Rust
mod field_doc_id_facet_codec;
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mod ordered_f64_codec;
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use std::borrow::Cow;
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use std::convert::TryFrom;
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use std::marker::PhantomData;
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use heed::types::{DecodeIgnore, OwnedType};
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use heed::{BytesDecode, BytesEncode};
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use roaring::RoaringBitmap;
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pub use self::field_doc_id_facet_codec::FieldDocIdFacetCodec;
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pub use self::ordered_f64_codec::OrderedF64Codec;
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use crate::{CboRoaringBitmapCodec, BEU16};
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use super::StrRefCodec;
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pub type FieldDocIdFacetF64Codec = FieldDocIdFacetCodec<OrderedF64Codec>;
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pub type FieldDocIdFacetStringCodec = FieldDocIdFacetCodec<StrRefCodec>;
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pub type FieldDocIdFacetIgnoreCodec = FieldDocIdFacetCodec<DecodeIgnore>;
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pub type FieldIdCodec = OwnedType<BEU16>;
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/// Tries to split a slice in half at the given middle point,
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/// `None` if the slice is too short.
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pub fn try_split_at(slice: &[u8], mid: usize) -> Option<(&[u8], &[u8])> {
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if slice.len() >= mid {
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Some(slice.split_at(mid))
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} else {
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None
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}
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}
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/// The key in the [`facet_id_string_docids` and `facet_id_f64_docids`][`Index::facet_id_string_docids`]
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/// databases.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)] // TODO: try removing PartialOrd and Ord
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pub struct FacetGroupKey<T> {
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pub field_id: u16,
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pub level: u8,
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pub left_bound: T,
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}
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/// The value in the [`facet_id_string_docids` and `facet_id_f64_docids`][`Index::facet_id_string_docids`]
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/// databases.
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#[derive(Debug)]
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pub struct FacetGroupValue {
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pub size: u8,
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pub bitmap: RoaringBitmap,
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}
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pub struct FacetGroupKeyCodec<T> {
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_phantom: PhantomData<T>,
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}
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impl<'a, T> heed::BytesEncode<'a> for FacetGroupKeyCodec<T>
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where
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T: BytesEncode<'a>,
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T::EItem: Sized,
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{
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type EItem = FacetGroupKey<T::EItem>;
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fn bytes_encode(value: &'a Self::EItem) -> Option<Cow<'a, [u8]>> {
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let mut v = vec![];
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v.extend_from_slice(&value.field_id.to_be_bytes());
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v.extend_from_slice(&[value.level]);
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let bound = T::bytes_encode(&value.left_bound)?;
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v.extend_from_slice(&bound);
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Some(Cow::Owned(v))
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}
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}
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impl<'a, T> heed::BytesDecode<'a> for FacetGroupKeyCodec<T>
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where
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T: BytesDecode<'a>,
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{
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type DItem = FacetGroupKey<T::DItem>;
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fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
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let fid = u16::from_be_bytes(<[u8; 2]>::try_from(&bytes[0..=1]).ok()?);
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let level = bytes[2];
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let bound = T::bytes_decode(&bytes[3..])?;
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Some(FacetGroupKey { field_id: fid, level, left_bound: bound })
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}
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}
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pub struct FacetGroupValueCodec;
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impl<'a> heed::BytesEncode<'a> for FacetGroupValueCodec {
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type EItem = FacetGroupValue;
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fn bytes_encode(value: &'a Self::EItem) -> Option<Cow<'a, [u8]>> {
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let mut v = vec![];
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v.push(value.size);
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CboRoaringBitmapCodec::serialize_into(&value.bitmap, &mut v);
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Some(Cow::Owned(v))
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}
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}
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impl<'a> heed::BytesDecode<'a> for FacetGroupValueCodec {
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type DItem = FacetGroupValue;
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fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
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let size = bytes[0];
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let bitmap = CboRoaringBitmapCodec::deserialize_from(&bytes[1..]).ok()?;
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Some(FacetGroupValue { size, bitmap })
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}
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}
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