Lucene.Net  3.0.3
Lucene.Net is a .NET port of the Java Lucene Indexing Library
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RegexTermEnum.cs
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2  * Licensed to the Apache Software Foundation (ASF) under one or more
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16  */
17 
18 using Lucene.Net.Index;
19 using Lucene.Net.Search;
20 
21 namespace Contrib.Regex
22 {
32  {
33  private string _sField = "";
34  private string _sPre = "";
35  private bool _bEndEnum;
36  private readonly IRegexCapabilities _regexImpl;
37 
38  public RegexTermEnum(IndexReader reader, Term term, IRegexCapabilities regexImpl)
39  {
40  _sField = term.Field;
41  string sText = term.Text;
42 
43  _regexImpl = regexImpl;
44 
45  _regexImpl.Compile(sText);
46 
47  _sPre = _regexImpl.Prefix() ?? "";
48 
49  SetEnum(reader.Terms(new Term(term.Field, _sPre)));
50  }
51 
53  protected override bool TermCompare(Term term)
54  {
55  if (_sField == term.Field)
56  {
57  string sSearchText = term.Text;
58  if (sSearchText.StartsWith(_sPre)) return _regexImpl.Match(sSearchText);
59  } //eif
60 
61  _bEndEnum = true;
62  return false;
63  }
64 
66  public override float Difference()
67  {
68  // TODO: adjust difference based on distance of searchTerm.text() and term().text()
69  return 1.0F;
70  }
71 
73  public override bool EndEnum()
74  {
75  return _bEndEnum;
76  }
77 
78  //public override void Close()
79  //{
80  // base.Close();
81  // _sField = null;
82  //}
83  }
84 }