org.elasticsearch.search.dfs.DfsPhase Maven / Gradle / Ivy

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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search licenses this
 * file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.search.dfs;

import org.apache.lucene.index.Term;
import org.elasticsearch.common.collect.ImmutableMap;
import org.elasticsearch.common.thread.ThreadLocals;
import org.elasticsearch.common.trove.THashSet;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.SearchPhase;
import org.elasticsearch.search.internal.SearchContext;

import java.util.Map;

/**
 * @author kimchy (shay.banon)
 */
public class DfsPhase implements SearchPhase {

    private static ThreadLocal>> cachedTermsSet = new ThreadLocal>>() {
        @Override protected ThreadLocals.CleanableValue> initialValue() {
            return new ThreadLocals.CleanableValue>(new THashSet());
        }
    };

    @Override public Map parseElements() {
        return ImmutableMap.of();
    }

    @Override public void preProcess(SearchContext context) {
    }

    public void execute(SearchContext context) {
        try {
            if (!context.queryRewritten()) {
                context.updateRewriteQuery(context.searcher().rewrite(context.query()));
            }

            THashSet termsSet = cachedTermsSet.get().get();
            termsSet.clear();
            context.query().extractTerms(termsSet);
            Term[] terms = termsSet.toArray(new Term[termsSet.size()]);
            int[] freqs = context.searcher().docFreqs(terms);

            context.dfsResult().termsAndFreqs(terms, freqs);
            context.dfsResult().maxDoc(context.searcher().getIndexReader().maxDoc());
        } catch (Exception e) {
            throw new DfsPhaseExecutionException(context, "", e);
        }
    }
}