1 | #Region "Microsoft.VisualBasic::6ae8cf02dcd96b1b68976fabbdf5cb7d, Microsoft.VisualBasic.Core\Text\StringSimilarity\IEqualityComparer.vb" |
2 | |
3 | ' Author: |
4 | ' |
5 | ' asuka (amethyst.asuka@gcmodeller.org) |
6 | ' xie (genetics@smrucc.org) |
7 | ' xieguigang (xie.guigang@live.com) |
8 | ' |
9 | ' Copyright (c) 2018 GPL3 Licensed |
10 | ' |
11 | ' |
12 | ' GNU GENERAL PUBLIC LICENSE (GPL3) |
13 | ' |
14 | ' |
15 | ' This program is free software: you can redistribute it and/or modify |
16 | ' it under the terms of the GNU General Public License as published by |
17 | ' the Free Software Foundation, either version 3 of the License, or |
18 | ' (at your option) any later version. |
19 | ' |
20 | ' This program is distributed in the hope that it will be useful, |
21 | ' but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | ' GNU General Public License for more details. |
24 | ' |
25 | ' You should have received a copy of the GNU General Public License |
26 | ' along with this program. If not, see <http://www.gnu.org/licenses/>. |
27 | |
28 | |
29 | |
30 | ' /********************************************************************************/ |
31 | |
32 | ' Summaries: |
33 | |
34 | ' Class StringEqualityHelper |
35 | ' |
36 | ' Properties: BinaryEquals, TextEquals |
37 | ' |
38 | ' Constructor: (+1 Overloads) Sub New |
39 | ' Function: Equals, GetHashCode, ToString |
40 | ' |
41 | ' |
42 | ' /********************************************************************************/ |
43 | |
44 | #End Region |
45 | |
46 | Imports System.Runtime.CompilerServices |
47 | Imports Microsoft.VisualBasic.Text.Levenshtein |
48 | |
49 | Namespace Text.Similarity |
50 | |
51 | ''' <summary> |
52 | ''' thresholds: |
53 | ''' |
54 | ''' + 0: text equals |
55 | ''' + 1: binary equals |
56 | ''' + (0, 1): similarity threshold |
57 | ''' </summary> |
58 | Public Class StringEqualityHelper : Implements IEqualityComparer(Of String) |
59 | |
60 | ''' <summary> |
61 | ''' + 0: text equals |
62 | ''' + 1: binary equals |
63 | ''' + (0, 1): similarity threshold |
64 | ''' </summary> |
65 | Dim threshold# |
66 | Dim compare As GenericLambda(Of String).IEquals |
67 | |
68 | ''' <summary> |
69 | ''' thresholds: |
70 | ''' |
71 | ''' + 0: text equals |
72 | ''' + 1: binary equals |
73 | ''' + (0, 1): similarity threshold |
74 | ''' </summary> |
75 | Sub New(threshold#) |
76 | Me.threshold = threshold |
77 | |
78 | If threshold = 0R Then |
79 | compare = Function(s1, s2) s1.TextEquals(s2) |
80 | ElseIf threshold = 1 Then |
81 | compare = Function(s1, s2) s1 = s2 |
82 | Else |
83 | compare = Function(s1, s2) |
84 | With LevenshteinDistance.ComputeDistance(s1, s2) |
85 | Return?.MatchSimilarity >= threshold |
86 | End With |
87 | End Function |
88 | End If |
89 | End Sub |
90 | |
91 | Public Shared ReadOnly Property TextEquals As New StringEqualityHelper(0) |
92 | Public Shared ReadOnly Property BinaryEquals As New StringEqualityHelper(1) |
93 | |
94 | Public Overrides Function ToString() As String |
95 | If threshold = 0R Then |
96 | Return "Text Equals Of the Two String" |
97 | ElseIf threshold = 1.0R Then |
98 | Return "Binary Equals Of the Two String" |
99 | Else |
100 | Return "String Similarity With threshold " & threshold |
101 | End If |
102 | End Function |
103 | |
104 | <MethodImpl(MethodImplOptions.AggressiveInlining)> |
105 | Public Overloads Function Equals(x As String, y As String) As Boolean Implements IEqualityComparer(Of String).Equals |
106 | Return compare(x, y) |
107 | End Function |
108 | |
109 | Public Overloads Function GetHashCode(obj As String) As Integer Implements IEqualityComparer(Of String).GetHashCode |
110 | If obj Is Nothing Then |
111 | Return 0 |
112 | End If |
113 | Return obj.GetHashCode |
114 | End Function |
115 | End Class |
116 | End Namespace |