org.elasticsearch.search.fetch.subphase.MatchedQueriesPhase Maven / Gradle / Ivy

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Elasticsearch subproject :server
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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */
package org.elasticsearch.search.fetch.subphase;

import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreMode;
import org.apache.lucene.search.ScorerSupplier;
import org.apache.lucene.search.Weight;
import org.apache.lucene.util.Bits;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.search.fetch.FetchContext;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.fetch.FetchSubPhaseProcessor;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public final class MatchedQueriesPhase implements FetchSubPhase {
    @Override
    public FetchSubPhaseProcessor getProcessor(FetchContext context) throws IOException {
        Map namedQueries = new HashMap<>();
        if (context.parsedQuery() != null) {
            namedQueries.putAll(context.parsedQuery().namedFilters());
        }
        if (context.parsedPostFilter() != null) {
            namedQueries.putAll(context.parsedPostFilter().namedFilters());
        }
        if (namedQueries.isEmpty()) {
            return null;
        }
        Map weights = new HashMap<>();
        for (Map.Entry entry : namedQueries.entrySet()) {
            weights.put(
                entry.getKey(),
                context.searcher().createWeight(context.searcher().rewrite(entry.getValue()), ScoreMode.COMPLETE_NO_SCORES, 1)
            );
        }
        return new FetchSubPhaseProcessor() {

            final Map matchingIterators = new HashMap<>();

            @Override
            public void setNextReader(LeafReaderContext readerContext) throws IOException {
                matchingIterators.clear();
                for (Map.Entry entry : weights.entrySet()) {
                    ScorerSupplier ss = entry.getValue().scorerSupplier(readerContext);
                    if (ss != null) {
                        Bits matchingBits = Lucene.asSequentialAccessBits(readerContext.reader().maxDoc(), ss);
                        matchingIterators.put(entry.getKey(), matchingBits);
                    }
                }
            }

            @Override
            public void process(HitContext hitContext) {
                List matches = new ArrayList<>();
                int doc = hitContext.docId();
                for (Map.Entry iterator : matchingIterators.entrySet()) {
                    if (iterator.getValue().get(doc)) {
                        matches.add(iterator.getKey());
                    }
                }
                hitContext.hit().matchedQueries(matches.toArray(String[]::new));
            }
        };
    }
}