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use crate::collector::Collector;
use crate::core::Executor;
use crate::core::SegmentReader;
use crate::query::Query;
use crate::schema::Document;
use crate::schema::Schema;
use crate::schema::Term;
use crate::space_usage::SearcherSpaceUsage;
use crate::store::StoreReader;
use crate::DocAddress;
use crate::Index;
use std::{fmt, io};
pub struct Searcher {
schema: Schema,
index: Index,
segment_readers: Vec<SegmentReader>,
store_readers: Vec<StoreReader>,
}
impl Searcher {
pub(crate) fn new(
schema: Schema,
index: Index,
segment_readers: Vec<SegmentReader>,
) -> io::Result<Searcher> {
let store_readers: Vec<StoreReader> = segment_readers
.iter()
.map(SegmentReader::get_store_reader)
.collect::<io::Result<Vec<_>>>()?;
Ok(Searcher {
schema,
index,
segment_readers,
store_readers,
})
}
pub fn index(&self) -> &Index {
&self.index
}
pub fn doc(&self, doc_address: DocAddress) -> crate::Result<Document> {
let DocAddress(segment_local_id, doc_id) = doc_address;
let store_reader = &self.store_readers[segment_local_id as usize];
store_reader.get(doc_id)
}
pub fn schema(&self) -> &Schema {
&self.schema
}
pub fn num_docs(&self) -> u64 {
self.segment_readers
.iter()
.map(|segment_reader| u64::from(segment_reader.num_docs()))
.sum::<u64>()
}
pub fn doc_freq(&self, term: &Term) -> crate::Result<u64> {
let mut total_doc_freq = 0;
for segment_reader in &self.segment_readers {
let inverted_index = segment_reader.inverted_index(term.field())?;
let doc_freq = inverted_index.doc_freq(term)?;
total_doc_freq += u64::from(doc_freq);
}
Ok(total_doc_freq)
}
pub fn segment_readers(&self) -> &[SegmentReader] {
&self.segment_readers
}
pub fn segment_reader(&self, segment_ord: u32) -> &SegmentReader {
&self.segment_readers[segment_ord as usize]
}
pub fn search<C: Collector>(
&self,
query: &dyn Query,
collector: &C,
) -> crate::Result<C::Fruit> {
let executor = self.index.search_executor();
self.search_with_executor(query, collector, executor)
}
pub fn search_with_executor<C: Collector>(
&self,
query: &dyn Query,
collector: &C,
executor: &Executor,
) -> crate::Result<C::Fruit> {
let scoring_enabled = collector.requires_scoring();
let weight = query.weight(self, scoring_enabled)?;
let segment_readers = self.segment_readers();
let fruits = executor.map(
|(segment_ord, segment_reader)| {
collector.collect_segment(weight.as_ref(), segment_ord as u32, segment_reader)
},
segment_readers.iter().enumerate(),
)?;
collector.merge_fruits(fruits)
}
pub fn space_usage(&self) -> io::Result<SearcherSpaceUsage> {
let mut space_usage = SearcherSpaceUsage::new();
for segment_reader in &self.segment_readers {
space_usage.add_segment(segment_reader.space_usage()?);
}
Ok(space_usage)
}
}
impl fmt::Debug for Searcher {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let segment_ids = self
.segment_readers
.iter()
.map(SegmentReader::segment_id)
.collect::<Vec<_>>();
write!(f, "Searcher({:?})", segment_ids)
}
}