| /* |
| * 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.lucene.facet; |
| |
| import org.apache.lucene.search.CollectorManager; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.List; |
| |
| /** |
| * A {@link CollectorManager} implementation which produces FacetsCollector and produces a merged FacetsCollector. |
| * This is used for concurrent FacetsCollection. |
| */ |
| public class FacetsCollectorManager implements CollectorManager<FacetsCollector, FacetsCollector> { |
| |
| /** Sole constructor. */ |
| public FacetsCollectorManager() { |
| } |
| |
| @Override |
| public FacetsCollector newCollector() throws IOException { |
| return new FacetsCollector(); |
| } |
| |
| @Override |
| public FacetsCollector reduce(Collection<FacetsCollector> collectors) throws IOException { |
| if (collectors == null || collectors.size() == 0) { |
| return new FacetsCollector(); |
| } if (collectors.size() == 1) { |
| return collectors.iterator().next(); |
| } |
| return new ReducedFacetsCollector(collectors); |
| } |
| |
| private static class ReducedFacetsCollector extends FacetsCollector { |
| |
| public ReducedFacetsCollector(final Collection<FacetsCollector> facetsCollectors) { |
| final List<MatchingDocs> matchingDocs = this.getMatchingDocs(); |
| facetsCollectors.forEach(facetsCollector -> matchingDocs.addAll(facetsCollector.getMatchingDocs())); |
| } |
| } |
| } |