org.apache.solr.search.grouping.collector.FilterCollector Maven / Gradle / Ivy
/*
* 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;
}
}