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use super::MultiValueIntFastFieldReader;
use DocId;
use termdict::TermOrdinal;
use schema::Facet;
use termdict::{TermDictionary, TermDictionaryImpl};
/// The facet reader makes it possible to access the list of
/// facets associated to a given document in a specific
/// segment.
///
/// Rather than manipulating `Facet` object directly, the API
/// exposes those in the form of list of `Facet` ordinal.
///
/// A segment ordinal can then be translated into a facet via
/// `.facet_from_ord(...)`.
///
/// Facet ordinals are defined as their position in the sorted
/// list of facets. This ordinal is segment local and
/// only makes sense for a given segment.
pub struct FacetReader {
term_ords: MultiValueIntFastFieldReader<u64>,
term_dict: TermDictionaryImpl,
}
impl FacetReader {
/// Creates a new `FacetReader`.
///
/// A facet reader just wraps :
/// - a `MultiValueIntFastFieldReader` that makes it possible to
/// access the list of facet ords for a given document.
/// - a `TermDictionaryImpl` that helps associating a facet to
/// an ordinal and vice versa.
pub fn new(
term_ords: MultiValueIntFastFieldReader<u64>,
term_dict: TermDictionaryImpl,
) -> FacetReader {
FacetReader {
term_ords,
term_dict,
}
}
/// Returns the size of the sets of facets in the segment.
/// This does not take in account the documents that may be marked
/// as deleted.
///
/// `Facet` ordinals range from `0` to `num_facets() - 1`.
pub fn num_facets(&self) -> usize {
self.term_dict.num_terms()
}
/// Accessor for the facet term dictionary.
pub fn facet_dict(&self) -> &TermDictionaryImpl {
&self.term_dict
}
/// Given a term ordinal returns the term associated to it.
pub fn facet_from_ord(&self, facet_ord: TermOrdinal, output: &mut Facet) {
let found_term = self.term_dict
.ord_to_term(facet_ord as u64, output.inner_buffer_mut());
assert!(found_term, "Term ordinal {} no found.", facet_ord);
}
/// Return the list of facet ordinals associated to a document.
pub fn facet_ords(&mut self, doc: DocId, output: &mut Vec<u64>) {
self.term_ords.get_vals(doc, output);
}
}
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