Lucene.Net  3.0.3
Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users.
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ScoreOrderFragmentsBuilder.cs
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1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 using System;
19 using System.Collections.Generic;
20 using System.Text;
21 
22 using WeightedFragInfo = Lucene.Net.Search.Vectorhighlight.FieldFragList.WeightedFragInfo;
23 
24 namespace Lucene.Net.Search.Vectorhighlight
25 {
26  /*
27  * An implementation of FragmentsBuilder that outputs score-order fragments.
28  */
30  {
31 
32  /// <summary>
33  /// a constructor.
34  /// </summary>
36  {
37  }
38 
39 
40  /// <summary>
41  /// a constructor.
42  /// </summary>
43  /// <param name="preTags">array of pre-tags for markup terms</param>
44  /// <param name="postTags">array of post-tags for markup terms</param>
45  public ScoreOrderFragmentsBuilder(String[] preTags, String[] postTags): base(preTags, postTags)
46  {
47  }
48 
49  /// <summary>
50  /// Sort by score the list of WeightedFragInfo
51  /// </summary>
52  public override List<WeightedFragInfo> GetWeightedFragInfoList(List<WeightedFragInfo> src)
53  {
54  src.Sort(new ScoreComparator());
55  return src;
56  }
57 
58  public class ScoreComparator : IComparer<WeightedFragInfo>
59  { // Comparator<WeightedFragInfo> {
60 
61  public int Compare(WeightedFragInfo o1, WeightedFragInfo o2)
62  {
63  if (o1.totalBoost > o2.totalBoost) return -1;
64  else if (o1.totalBoost < o2.totalBoost) return 1;
65  // if same score then check startOffset
66  else
67  {
68  if (o1.startOffset < o2.startOffset) return -1;
69  else if (o1.startOffset > o2.startOffset) return 1;
70  }
71  return 0;
72  }
73  }
74  }
75 
76 }