| /* |
| * 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; |
| |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.search.Collector; |
| import org.apache.lucene.search.LeafCollector; |
| import org.apache.lucene.search.Scorable; |
| import org.apache.lucene.search.ScoreMode; |
| import org.apache.lucene.search.SimpleCollector; |
| |
| |
| /** A simple delegating collector where one can set the delegate after creation */ |
| public class DelegatingCollector extends SimpleCollector { |
| |
| /* for internal testing purposes only to determine the number of times a delegating collector chain was used */ |
| public static int setLastDelegateCount; |
| |
| protected Collector delegate; |
| protected LeafCollector leafDelegate; |
| protected Scorable scorer; |
| protected LeafReaderContext context; |
| protected int docBase; |
| |
| public Collector getDelegate() { |
| return delegate; |
| } |
| |
| public void setDelegate(Collector delegate) { |
| this.delegate = delegate; |
| } |
| |
| /** Sets the last delegate in a chain of DelegatingCollectors */ |
| public void setLastDelegate(Collector delegate) { |
| DelegatingCollector ptr = this; |
| for(; ptr.getDelegate() instanceof DelegatingCollector; ptr = (DelegatingCollector)ptr.getDelegate()); |
| ptr.setDelegate(delegate); |
| setLastDelegateCount++; |
| } |
| |
| @Override |
| public void setScorer(Scorable scorer) throws IOException { |
| this.scorer = scorer; |
| if (leafDelegate != null) { |
| leafDelegate.setScorer(scorer); |
| } |
| } |
| |
| @Override |
| public ScoreMode scoreMode() { |
| return delegate.scoreMode(); |
| } |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| leafDelegate.collect(doc); |
| } |
| |
| @Override |
| protected void doSetNextReader(LeafReaderContext context) throws IOException { |
| this.context = context; |
| this.docBase = context.docBase; |
| leafDelegate = delegate.getLeafCollector(context); |
| } |
| |
| public void finish() throws IOException { |
| if(delegate instanceof DelegatingCollector) { |
| ((DelegatingCollector) delegate).finish(); |
| } |
| } |
| } |
| |