| <!DOCTYPE html> |
| <!--[if IE]><![endif]--> |
| <html> |
| |
| <head> |
| <meta charset="utf-8"> |
| <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> |
| <title>Namespace Lucene.Net.Analysis.Cn |
| | Apache Lucene.NET 4.8.0-beta00008 Documentation </title> |
| <meta name="viewport" content="width=device-width"> |
| <meta name="title" content="Namespace Lucene.Net.Analysis.Cn |
| | Apache Lucene.NET 4.8.0-beta00008 Documentation "> |
| <meta name="generator" content="docfx 2.50.0.0"> |
| |
| <link rel="shortcut icon" href="../../logo/favicon.ico"> |
| <link rel="stylesheet" href="../../styles/docfx.vendor.css"> |
| <link rel="stylesheet" href="../../styles/docfx.css"> |
| <link rel="stylesheet" href="../../styles/main.css"> |
| <meta property="docfx:navrel" content="../../toc.html"> |
| <meta property="docfx:tocrel" content="../toc.html"> |
| |
| <meta property="docfx:rel" content="../../"> |
| |
| </head> |
| <body data-spy="scroll" data-target="#affix" data-offset="120"> |
| <div id="wrapper"> |
| <header> |
| |
| <nav id="autocollapse" class="navbar ng-scope" role="navigation"> |
| <div class="container"> |
| <div class="navbar-header"> |
| <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar"> |
| <span class="sr-only">Toggle navigation</span> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| </button> |
| |
| <a class="navbar-brand" href="../../index.html"> |
| <img id="logo" class="svg" src="../../logo/lucene-net-color.png" alt=""> |
| </a> |
| </div> |
| <div class="collapse navbar-collapse" id="navbar"> |
| <form class="navbar-form navbar-right" role="search" id="search"> |
| <div class="form-group"> |
| <input type="text" class="form-control" id="search-query" placeholder="Search" autocomplete="off"> |
| </div> |
| </form> |
| </div> |
| </div> |
| </nav> |
| |
| <div class="subnav navbar navbar-default"> |
| <div class="container hide-when-search" id="breadcrumb"> |
| <ul class="breadcrumb"> |
| <li></li> |
| </ul> |
| </div> |
| </div> |
| </header> |
| <div class="container body-content"> |
| |
| <div id="search-results"> |
| <div class="search-list"></div> |
| <div class="sr-items"> |
| <p><i class="glyphicon glyphicon-refresh index-loading"></i></p> |
| </div> |
| <ul id="pagination"></ul> |
| </div> |
| </div> |
| <div role="main" class="container body-content hide-when-search"> |
| |
| <div class="sidenav hide-when-search"> |
| <a class="btn toc-toggle collapse" data-toggle="collapse" href="#sidetoggle" aria-expanded="false" aria-controls="sidetoggle">Show / Hide Table of Contents</a> |
| <div class="sidetoggle collapse" id="sidetoggle"> |
| <div id="sidetoc"></div> |
| </div> |
| </div> |
| <div class="article row grid-right"> |
| <div class="col-md-10"> |
| <article class="content wrap" id="_content" data-uid="Lucene.Net.Analysis.Cn"> |
| |
| <h1 id="Lucene_Net_Analysis_Cn" data-uid="Lucene.Net.Analysis.Cn" class="text-break">Namespace Lucene.Net.Analysis.Cn |
| </h1> |
| <div class="markdown level0 summary"><!-- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| --> |
| <p>Analyzer for Chinese, which indexes unigrams (individual chinese characters).</p> |
| <p> Three analyzers are provided for Chinese, each of which treats Chinese text in a different way. * StandardAnalyzer: Index unigrams (individual Chinese characters) as a token. * CJKAnalyzer (in the analyzers/cjk package): Index bigrams (overlapping groups of two adjacent Chinese characters) as tokens. * SmartChineseAnalyzer (in the analyzers/smartcn package): Index words (attempt to segment Chinese text into words) as tokens. Example phrase: "我是中国人" 1. StandardAnalyzer: 我-是-中-国-人 2. CJKAnalyzer: 我是-是中-中国-国人 3. SmartChineseAnalyzer: 我-是-中国-人 </p> |
| </div> |
| <div class="markdown level0 conceptual"></div> |
| <div class="markdown level0 remarks"></div> |
| <h3 id="classes">Classes |
| </h3> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cn.ChineseAnalyzer.html">ChineseAnalyzer</a></h4> |
| <section><p>An <a class="xref" href="../Lucene.Net/Lucene.Net.Analysis.Analyzer.html">Analyzer</a> that tokenizes text with <a class="xref" href="Lucene.Net.Analysis.Cn.ChineseTokenizer.html">ChineseTokenizer</a> and |
| filters with <a class="xref" href="Lucene.Net.Analysis.Cn.ChineseFilter.html">ChineseFilter</a></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cn.ChineseFilter.html">ChineseFilter</a></h4> |
| <section><p>A <a class="xref" href="../Lucene.Net/Lucene.Net.Analysis.TokenFilter.html">TokenFilter</a> with a stop word table.<br><ul><li>Numeric tokens are removed.</li><li>English tokens must be larger than 1 character.</li><li>One Chinese character as one Chinese word.</li></ul> |
| TO DO: |
| <ol><li>Add Chinese stop words, such as \ue400</li><li>Dictionary based Chinese word extraction</li><li>Intelligent Chinese word extraction</li></ol></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cn.ChineseFilterFactory.html">ChineseFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Cn.ChineseFilter.html">ChineseFilter</a> </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cn.ChineseTokenizer.html">ChineseTokenizer</a></h4> |
| <section><p>Tokenize Chinese text as individual chinese characters.</p> |
| <p> |
| The difference between <a class="xref" href="Lucene.Net.Analysis.Cn.ChineseTokenizer.html">ChineseTokenizer</a> and |
| <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKTokenizer.html">CJKTokenizer</a> is that they have different |
| token parsing logic. |
| </p> |
| <p> |
| For example, if the Chinese text |
| "C1C2C3C4" is to be indexed: |
| <ul><li>The tokens returned from ChineseTokenizer are C1, C2, C3, C4.</li><li>The tokens returned from the CJKTokenizer are C1C2, C2C3, C3C4.</li></ul> |
| </p> |
| <p> |
| Therefore the index created by <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKTokenizer.html">CJKTokenizer</a> is much larger. |
| </p> |
| <p> |
| The problem is that when searching for C1, C1C2, C1C3, |
| C4C2, C1C2C3 ... the <a class="xref" href="Lucene.Net.Analysis.Cn.ChineseTokenizer.html">ChineseTokenizer</a> works, but the |
| <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKTokenizer.html">CJKTokenizer</a> will not work. |
| </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cn.ChineseTokenizerFactory.html">ChineseTokenizerFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Cn.ChineseTokenizer.html">ChineseTokenizer</a></p> |
| </section> |
| </article> |
| </div> |
| |
| <div class="hidden-sm col-md-2" role="complementary"> |
| <div class="sideaffix"> |
| <div class="contribution"> |
| <ul class="nav"> |
| <li> |
| <a href="https://github.com/apache/lucenenet/blob/docs/4.8.0-beta00008/src/Lucene.Net.Analysis.Common/Analysis/Cn/package.md/#L2" class="contribution-link">Improve this Doc</a> |
| </li> |
| </ul> |
| </div> |
| <nav class="bs-docs-sidebar hidden-print hidden-xs hidden-sm affix" id="affix"> |
| <!-- <p><a class="back-to-top" href="#top">Back to top</a><p> --> |
| </nav> |
| </div> |
| </div> |
| </div> |
| </div> |
| |
| <footer> |
| <div class="grad-bottom"></div> |
| <div class="footer"> |
| <div class="container"> |
| <span class="pull-right"> |
| <a href="#top">Back to top</a> |
| </span> |
| Copyright © 2020 Licensed to the Apache Software Foundation (ASF) |
| |
| </div> |
| </div> |
| </footer> |
| </div> |
| |
| <script type="text/javascript" src="../../styles/docfx.vendor.js"></script> |
| <script type="text/javascript" src="../../styles/docfx.js"></script> |
| <script type="text/javascript" src="../../styles/main.js"></script> |
| </body> |
| </html> |