37 lines
1.2 KiB
Rust
37 lines
1.2 KiB
Rust
use std::borrow::Cow;
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use std::convert::TryInto;
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use crate::{FieldId, DocumentId};
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use crate::facet::value_encoding::f64_into_bytes;
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pub struct FieldDocIdFacetF64Codec;
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impl<'a> heed::BytesDecode<'a> for FieldDocIdFacetF64Codec {
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type DItem = (FieldId, DocumentId, f64);
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fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
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let (field_id, bytes) = bytes.split_first()?;
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let (document_id_bytes, bytes) = bytes.split_at(4);
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let document_id = document_id_bytes.try_into().map(u32::from_be_bytes).ok()?;
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let value = bytes[8..16].try_into().map(f64::from_be_bytes).ok()?;
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Some((*field_id, document_id, value))
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}
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}
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impl<'a> heed::BytesEncode<'a> for FieldDocIdFacetF64Codec {
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type EItem = (FieldId, DocumentId, f64);
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fn bytes_encode((field_id, document_id, value): &Self::EItem) -> Option<Cow<[u8]>> {
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let mut bytes = Vec::with_capacity(1 + 4 + 8 + 8);
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bytes.push(*field_id);
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bytes.extend_from_slice(&document_id.to_be_bytes());
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let value_bytes = f64_into_bytes(*value)?;
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bytes.extend_from_slice(&value_bytes);
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bytes.extend_from_slice(&value.to_be_bytes());
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Some(Cow::Owned(bytes))
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}
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}
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