Lucene.Net  3.0.3
Lucene.Net is a .NET port of the Java Lucene Indexing Library
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SpanQueryFilter.cs
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2  * Licensed to the Apache Software Foundation (ASF) under one or more
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9  * http://www.apache.org/licenses/LICENSE-2.0
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17 
18 using System;
19 using System.Collections.Generic;
20 using IndexReader = Lucene.Net.Index.IndexReader;
21 using OpenBitSet = Lucene.Net.Util.OpenBitSet;
22 using SpanQuery = Lucene.Net.Search.Spans.SpanQuery;
23 
24 namespace Lucene.Net.Search
25 {
26 
40  [Serializable]
42  {
43  protected internal SpanQuery internalQuery;
44 
45  protected internal SpanQueryFilter()
46  {
47  }
48 
54  public SpanQueryFilter(SpanQuery query)
55  {
56  this.internalQuery = query;
57  }
58 
59  public override DocIdSet GetDocIdSet(IndexReader reader)
60  {
61  SpanFilterResult result = BitSpans(reader);
62  return result.DocIdSet;
63  }
64 
65  public override SpanFilterResult BitSpans(IndexReader reader)
66  {
67 
68  OpenBitSet bits = new OpenBitSet(reader.MaxDoc);
69  Lucene.Net.Search.Spans.Spans spans = internalQuery.GetSpans(reader);
70  IList<SpanFilterResult.PositionInfo> tmp = new List<SpanFilterResult.PositionInfo>(20);
71  int currentDoc = - 1;
72  SpanFilterResult.PositionInfo currentInfo = null;
73  while (spans.Next())
74  {
75  int doc = spans.Doc();
76  bits.Set(doc);
77  if (currentDoc != doc)
78  {
79  currentInfo = new SpanFilterResult.PositionInfo(doc);
80  tmp.Add(currentInfo);
81  currentDoc = doc;
82  }
83  currentInfo.AddPosition(spans.Start(), spans.End());
84  }
85  return new SpanFilterResult(bits, tmp);
86  }
87 
88 
89  public virtual SpanQuery Query
90  {
91  get { return internalQuery; }
92  }
93 
94  public override System.String ToString()
95  {
96  return "SpanQueryFilter(" + internalQuery + ")";
97  }
98 
99  public override bool Equals(System.Object o)
100  {
101  return o is SpanQueryFilter && this.internalQuery.Equals(((SpanQueryFilter) o).internalQuery);
102  }
103 
104  public override int GetHashCode()
105  {
106  return internalQuery.GetHashCode() ^ unchecked((int) 0x923F64B9);
107  }
108  }
109 }