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There is a newer version: 8.15.1

/*
 * 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.common.lucene;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Collector;
import org.apache.lucene.search.Scorer;

import java.io.IOException;

/**
 * @author kimchy (Shay Banon)
 */
public class MultiCollector extends Collector {

    private final Collector collector;

    private final Collector[] collectors;

    public MultiCollector(Collector collector, Collector[] collectors) {
        this.collector = collector;
        this.collectors = collectors;
    }

    @Override public void setScorer(Scorer scorer) throws IOException {
        collector.setScorer(scorer);
        for (Collector collector : collectors) {
            collector.setScorer(scorer);
        }
    }

    @Override public void collect(int doc) throws IOException {
        collector.collect(doc);
        for (Collector collector : collectors) {
            collector.collect(doc);
        }
    }

    @Override public void setNextReader(IndexReader reader, int docBase) throws IOException {
        collector.setNextReader(reader, docBase);
        for (Collector collector : collectors) {
            collector.setNextReader(reader, docBase);
        }
    }

    @Override public boolean acceptsDocsOutOfOrder() {
        if (!collector.acceptsDocsOutOfOrder()) {
            return false;
        }
        for (Collector collector : collectors) {
            if (!collector.acceptsDocsOutOfOrder()) {
                return false;
            }
        }
        return true;
    }
}