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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contrib
Regex
RegexTermEnum.cs
Go to the documentation of this file.
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using
Lucene.Net.Index;
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using
Lucene.Net.Search;
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namespace
Contrib.Regex
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{
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/// <summary>
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/// Subclass of FilteredTermEnum for enumerating all terms that match the
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/// specified regular expression term using the specified regular expression
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/// implementation.
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/// <para>Term enumerations are always ordered by Term.compareTo(). Each term in
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/// the enumeration is greater than all that precede it.</para>
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/// </summary>
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/// <remarks>http://www.java2s.com/Open-Source/Java-Document/Net/lucene-connector/org/apache/lucene/search/regex/RegexTermEnum.java.htm</remarks>
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public
class
RegexTermEnum
:
FilteredTermEnum
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{
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private
string
_sField =
""
;
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private
string
_sPre =
""
;
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private
bool
_bEndEnum;
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private
readonly
IRegexCapabilities
_regexImpl;
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public
RegexTermEnum
(
IndexReader
reader,
Term
term,
IRegexCapabilities
regexImpl)
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{
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_sField = term.
Field
;
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string
sText = term.
Text
;
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_regexImpl = regexImpl;
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_regexImpl.
Compile
(sText);
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_sPre = _regexImpl.Prefix() ??
""
;
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SetEnum(reader.
Terms
(
new
Term
(term.
Field
, _sPre)));
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}
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/// <summary>Equality compare on the term </summary>
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protected
override
bool
TermCompare(
Term
term)
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{
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if
(_sField == term.
Field
)
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{
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string
sSearchText = term.
Text
;
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if
(sSearchText.StartsWith(_sPre))
return
_regexImpl.Match(sSearchText);
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}
//eif
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_bEndEnum =
true
;
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return
false
;
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}
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/// <summary>Equality measure on the term </summary>
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public
override
float
Difference()
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{
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// TODO: adjust difference based on distance of searchTerm.text() and term().text()
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return
1.0F;
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}
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/// <summary>Indicates the end of the enumeration has been reached </summary>
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public
override
bool
EndEnum()
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{
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return
_bEndEnum;
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}
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//public override void Close()
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//{
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// base.Close();
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// _sField = null;
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//}
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}
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}
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