org.apache.blur.lucene.search.BlurScoreDocCollector.java Source code

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Here is the source code for org.apache.blur.lucene.search.BlurScoreDocCollector.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.blur.lucene.search;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.lucene.search.Collector;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.TopScoreDocCollector;

public class BlurScoreDocCollector extends CloneableCollector implements TopDocCollectorInterface {

    public static BlurScoreDocCollector create(int numHitsToCollect, ScoreDoc after, boolean runSlow,
            AtomicBoolean running) {
        return new BlurScoreDocCollector(numHitsToCollect, after, runSlow, running);
    }

    private ScoreDoc _after;
    private int _numHitsToCollect;
    private AtomicBoolean _running;
    private boolean _runSlow;
    private int _hits;
    private TopDocs _topDocs;

    public BlurScoreDocCollector(int numHitsToCollect, ScoreDoc after, boolean runSlow, AtomicBoolean running) {
        _numHitsToCollect = numHitsToCollect;
        _after = after;
        _runSlow = runSlow;
        _running = running;
    }

    @Override
    public int getTotalHits() {
        return _hits;
    }

    @Override
    public TopDocs topDocs() {
        return _topDocs;
    }

    @Override
    public Collector newCollector() {
        TopScoreDocCollector collector = TopScoreDocCollector.create(_numHitsToCollect, _after, true);
        Collector col = new StopExecutionCollector(collector, _running);
        if (_runSlow) {
            return new SlowCollector(col);
        }
        return col;
    }

    @Override
    public Collector merge(Collector... merge) throws IOException {
        List<TopScoreDocCollector> list = new ArrayList<TopScoreDocCollector>();
        for (Collector collector : merge) {
            list.add(getTopScoreDocCollector(collector));
        }
        int i = 0;
        TopDocs[] results = new TopDocs[list.size()];
        for (TopScoreDocCollector tsdc : list) {
            _hits += tsdc.getTotalHits();
            results[i++] = tsdc.topDocs();
        }
        _topDocs = TopDocs.merge(null, _numHitsToCollect, results);
        return this;
    }

    private TopScoreDocCollector getTopScoreDocCollector(Collector collector) {
        if (collector instanceof SlowCollector) {
            SlowCollector slowCollector = (SlowCollector) collector;
            return getTopScoreDocCollector(slowCollector.getCollector());
        } else if (collector instanceof StopExecutionCollector) {
            StopExecutionCollector stopExecutionCollector = (StopExecutionCollector) collector;
            return getTopScoreDocCollector(stopExecutionCollector.getCollector());
        } else if (collector instanceof TopScoreDocCollector) {
            TopScoreDocCollector topScoreDocCollector = (TopScoreDocCollector) collector;
            return topScoreDocCollector;
        } else {
            throw new RuntimeException("Collector type [" + collector + "] not supported.");
        }
    }
}