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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::term_scorer::TermScorer; |
| <span class="kw">use </span><span class="kw">crate</span>::core::SegmentReader; |
| <span class="kw">use </span><span class="kw">crate</span>::docset::DocSet; |
| <span class="kw">use </span><span class="kw">crate</span>::fieldnorm::FieldNormReader; |
| <span class="kw">use </span><span class="kw">crate</span>::postings::SegmentPostings; |
| <span class="kw">use </span><span class="kw">crate</span>::query::bm25::Bm25Weight; |
| <span class="kw">use </span><span class="kw">crate</span>::query::explanation::does_not_match; |
| <span class="kw">use </span><span class="kw">crate</span>::query::weight::{for_each_docset, for_each_scorer}; |
| <span class="kw">use </span><span class="kw">crate</span>::query::{Explanation, Scorer, Weight}; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::IndexRecordOption; |
| <span class="kw">use crate</span>::{DocId, Score, Term}; |
| |
| <span class="kw">pub struct </span>TermWeight { |
| term: Term, |
| index_record_option: IndexRecordOption, |
| similarity_weight: Bm25Weight, |
| scoring_enabled: bool, |
| } |
| |
| <span class="kw">impl </span>Weight <span class="kw">for </span>TermWeight { |
| <span class="kw">fn </span>scorer(<span class="kw-2">&</span><span class="self">self</span>, reader: <span class="kw-2">&</span>SegmentReader, boost: Score) -> <span class="kw">crate</span>::Result<Box<<span class="kw">dyn </span>Scorer>> { |
| <span class="kw">let </span>term_scorer = <span class="self">self</span>.specialized_scorer(reader, boost)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Box::new(term_scorer)) |
| } |
| |
| <span class="kw">fn </span>explain(<span class="kw-2">&</span><span class="self">self</span>, reader: <span class="kw-2">&</span>SegmentReader, doc: DocId) -> <span class="kw">crate</span>::Result<Explanation> { |
| <span class="kw">let </span><span class="kw-2">mut </span>scorer = <span class="self">self</span>.specialized_scorer(reader, <span class="number">1.0</span>)<span class="question-mark">?</span>; |
| <span class="kw">if </span>scorer.doc() > doc || scorer.seek(doc) != doc { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(does_not_match(doc)); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>explanation = scorer.explain(); |
| explanation.add_context(<span class="macro">format!</span>(<span class="string">"Term={:?}"</span>, <span class="self">self</span>.term,)); |
| <span class="prelude-val">Ok</span>(explanation) |
| } |
| |
| <span class="kw">fn </span>count(<span class="kw-2">&</span><span class="self">self</span>, reader: <span class="kw-2">&</span>SegmentReader) -> <span class="kw">crate</span>::Result<u32> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(alive_bitset) = reader.alive_bitset() { |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.scorer(reader, <span class="number">1.0</span>)<span class="question-mark">?</span>.count(alive_bitset)) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>field = <span class="self">self</span>.term.field(); |
| <span class="kw">let </span>inv_index = reader.inverted_index(field)<span class="question-mark">?</span>; |
| <span class="kw">let </span>term_info = inv_index.get_term_info(<span class="kw-2">&</span><span class="self">self</span>.term)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(term_info.map(|term_info| term_info.doc_freq).unwrap_or(<span class="number">0</span>)) |
| } |
| } |
| |
| <span class="doccomment">/// Iterates through all of the document matched by the DocSet |
| /// `DocSet` and push the scored documents to the collector. |
| </span><span class="kw">fn </span>for_each( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| reader: <span class="kw-2">&</span>SegmentReader, |
| callback: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(DocId, Score), |
| ) -> <span class="kw">crate</span>::Result<()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>scorer = <span class="self">self</span>.specialized_scorer(reader, <span class="number">1.0</span>)<span class="question-mark">?</span>; |
| for_each_scorer(<span class="kw-2">&mut </span>scorer, callback); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Iterates through all of the document matched by the DocSet |
| /// `DocSet` and push the scored documents to the collector. |
| </span><span class="kw">fn </span>for_each_no_score( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| reader: <span class="kw-2">&</span>SegmentReader, |
| callback: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(DocId), |
| ) -> <span class="kw">crate</span>::Result<()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>scorer = <span class="self">self</span>.specialized_scorer(reader, <span class="number">1.0</span>)<span class="question-mark">?</span>; |
| for_each_docset(<span class="kw-2">&mut </span>scorer, callback); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Calls `callback` with all of the `(doc, score)` for which score |
| /// is exceeding a given threshold. |
| /// |
| /// This method is useful for the TopDocs collector. |
| /// For all docsets, the blanket implementation has the benefit |
| /// of prefiltering (doc, score) pairs, avoiding the |
| /// virtual dispatch cost. |
| /// |
| /// More importantly, it makes it possible for scorers to implement |
| /// important optimization (e.g. BlockWAND for union). |
| </span><span class="kw">fn </span>for_each_pruning( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| threshold: Score, |
| reader: <span class="kw-2">&</span>SegmentReader, |
| callback: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(DocId, Score) -> Score, |
| ) -> <span class="kw">crate</span>::Result<()> { |
| <span class="kw">let </span>scorer = <span class="self">self</span>.specialized_scorer(reader, <span class="number">1.0</span>)<span class="question-mark">?</span>; |
| <span class="kw">crate</span>::query::boolean_query::block_wand_single_scorer(scorer, threshold, callback); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>TermWeight { |
| <span class="kw">pub fn </span>new( |
| term: Term, |
| index_record_option: IndexRecordOption, |
| similarity_weight: Bm25Weight, |
| scoring_enabled: bool, |
| ) -> TermWeight { |
| TermWeight { |
| term, |
| index_record_option, |
| similarity_weight, |
| scoring_enabled, |
| } |
| } |
| |
| <span class="kw">pub fn </span>term(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Term { |
| <span class="kw-2">&</span><span class="self">self</span>.term |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>specialized_scorer( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| reader: <span class="kw-2">&</span>SegmentReader, |
| boost: Score, |
| ) -> <span class="kw">crate</span>::Result<TermScorer> { |
| <span class="kw">let </span>field = <span class="self">self</span>.term.field(); |
| <span class="kw">let </span>inverted_index = reader.inverted_index(field)<span class="question-mark">?</span>; |
| <span class="kw">let </span>fieldnorm_reader_opt = <span class="kw">if </span><span class="self">self</span>.scoring_enabled { |
| reader.fieldnorms_readers().get_field(field)<span class="question-mark">? |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>}; |
| <span class="kw">let </span>fieldnorm_reader = |
| fieldnorm_reader_opt.unwrap_or_else(|| FieldNormReader::constant(reader.max_doc(), <span class="number">1</span>)); |
| <span class="kw">let </span>similarity_weight = <span class="self">self</span>.similarity_weight.boost_by(boost); |
| <span class="kw">let </span>postings_opt: <span class="prelude-ty">Option</span><SegmentPostings> = |
| inverted_index.read_postings(<span class="kw-2">&</span><span class="self">self</span>.term, <span class="self">self</span>.index_record_option)<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(segment_postings) = postings_opt { |
| <span class="prelude-val">Ok</span>(TermScorer::new( |
| segment_postings, |
| fieldnorm_reader, |
| similarity_weight, |
| )) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(TermScorer::new( |
| SegmentPostings::empty(), |
| fieldnorm_reader, |
| similarity_weight, |
| )) |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
