| /* |
| * 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.solr.search.grouping.collector; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.search.LeafCollector; |
| import org.apache.lucene.search.Collector; |
| import org.apache.lucene.search.FilterLeafCollector; |
| import org.apache.solr.search.DocSet; |
| |
| /** |
| * A collector that filters incoming doc ids that are not in the filter. |
| * |
| * @lucene.experimental |
| */ |
| public class FilterCollector extends org.apache.lucene.search.FilterCollector { |
| |
| private final DocSet filter; |
| private int matches; |
| |
| public FilterCollector(DocSet filter, Collector delegate) { |
| super(delegate); |
| this.filter = filter; |
| } |
| |
| @Override |
| public LeafCollector getLeafCollector(LeafReaderContext context) |
| throws IOException { |
| final int docBase = context.docBase; |
| return new FilterLeafCollector(super.getLeafCollector(context)) { |
| @Override |
| public void collect(int doc) throws IOException { |
| matches++; |
| if (filter.exists(doc + docBase)) { |
| super.collect(doc); |
| } |
| } |
| }; |
| } |
| |
| public int getMatches() { |
| return matches; |
| } |
| |
| /** |
| * Returns the delegate collector |
| * |
| * @return the delegate collector |
| */ |
| public Collector getDelegate() { |
| return in; |
| } |
| } |