1 package org.apache.lucene.search;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
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20 import java.io.IOException;
22 import org.apache.lucene.index.IndexReader;
25 * A {@link Collector} implementation which wraps another
26 * {@link Collector} and makes sure only documents with
27 * scores > 0 are collected.
29 public class PositiveScoresOnlyCollector extends Collector {
31 final private Collector c;
32 private Scorer scorer;
34 public PositiveScoresOnlyCollector(Collector c) {
39 public void collect(int doc) throws IOException {
40 if (scorer.score() > 0) {
46 public void setNextReader(IndexReader reader, int docBase) throws IOException {
47 c.setNextReader(reader, docBase);
51 public void setScorer(Scorer scorer) throws IOException {
52 // Set a ScoreCachingWrappingScorer in case the wrapped Collector will call
54 this.scorer = new ScoreCachingWrappingScorer(scorer);
55 c.setScorer(this.scorer);
59 public boolean acceptsDocsOutOfOrder() {
60 return c.acceptsDocsOutOfOrder();