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| <h1 id="Lucene_Net_Analysis_Core" data-uid="Lucene.Net.Analysis.Core" class="text-break">Namespace Lucene.Net.Analysis.Core |
| </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 |
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| The ASF licenses this file to You under the Apache License, Version 2.0 |
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| <p>Basic, general-purpose analysis components.</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.Core.KeywordAnalyzer.html">KeywordAnalyzer</a></h4> |
| <section><p>"Tokenizes" the entire stream as a single token. This is useful |
| for data like zip codes, ids, and some product names.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.KeywordTokenizer.html">KeywordTokenizer</a></h4> |
| <section><p>Emits the entire input as a single token.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.KeywordTokenizerFactory.html">KeywordTokenizerFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Core.KeywordTokenizer.html">KeywordTokenizer</a>. </p> |
| <pre><code><fieldType name="text_keyword" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.KeywordTokenizerFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a></h4> |
| <section><p>A <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a> is a tokenizer that divides text at non-letters. That's to |
| say, it defines tokens as maximal strings of adjacent letters, as defined by |
| <span class="xref">System.Char.IsLetter(System.Char)</span> predicate. |
| <p> |
| Note: this does a decent job for most European languages, but does a terrible |
| job for some Asian languages, where words are not separated by spaces. |
| </p> |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> compatibility when creating |
| <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a>: |
| <ul><li>As of 3.1, <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html">CharTokenizer</a> uses an <span class="xref">System.Int32</span> based API to normalize and |
| detect token characters. See <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_IsTokenChar_System_Int32_">IsTokenChar(Int32)</a> and |
| <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_Normalize_System_Int32_">Normalize(Int32)</a> for details.</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizerFactory.html">LetterTokenizerFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a>. </p> |
| <pre><code><fieldType name="text_letter" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.LetterTokenizerFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a></h4> |
| <section><p>Normalizes token text to lower case. |
| <p>You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> |
| compatibility when creating LowerCaseFilter: |
| <ul><li> As of 3.1, supplementary characters are properly lowercased.</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilterFactory.html">LowerCaseFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a>. </p> |
| <pre><code><fieldType name="text_lwrcase" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.LowerCaseFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseTokenizer.html">LowerCaseTokenizer</a></h4> |
| <section><p><a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseTokenizer.html">LowerCaseTokenizer</a> performs the function of <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a> |
| and <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a> together. It divides text at non-letters and converts |
| them to lower case. While it is functionally equivalent to the combination |
| of <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a> and <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a>, there is a performance advantage |
| to doing the two tasks at once, hence this (redundant) implementation. |
| <p> |
| Note: this does a decent job for most European languages, but does a terrible |
| job for some Asian languages, where words are not separated by spaces. |
| </p> |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> compatibility when creating |
| <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseTokenizer.html">LowerCaseTokenizer</a>: |
| <ul><li>As of 3.1, <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html">CharTokenizer</a> uses an int based API to normalize and |
| detect token characters. See <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_IsTokenChar_System_Int32_">IsTokenChar(Int32)</a> and |
| <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_Normalize_System_Int32_">Normalize(Int32)</a> for details.</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseTokenizerFactory.html">LowerCaseTokenizerFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseTokenizer.html">LowerCaseTokenizer</a>. </p> |
| <pre><code><fieldType name="text_lwrcase" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.LowerCaseTokenizerFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.SimpleAnalyzer.html">SimpleAnalyzer</a></h4> |
| <section><p>An <span class="xref">Lucene.Net.Analysis.Analyzer</span> that filters <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a> |
| with <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a> |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> compatibility |
| when creating <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html">CharTokenizer</a>: |
| <ul><li>As of 3.1, <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseTokenizer.html">LowerCaseTokenizer</a> uses an int based API to normalize and |
| detect token codepoints. See <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_IsTokenChar_System_Int32_">IsTokenChar(Int32)</a> and |
| <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_Normalize_System_Int32_">Normalize(Int32)</a> for details.</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.StopAnalyzer.html">StopAnalyzer</a></h4> |
| <section><p>Filters <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a> with <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a> and <a class="xref" href="Lucene.Net.Analysis.Core.StopFilter.html">StopFilter</a>. |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> |
| compatibility when creating <a class="xref" href="Lucene.Net.Analysis.Core.StopAnalyzer.html">StopAnalyzer</a>: |
| <ul><li> As of 3.1, StopFilter correctly handles Unicode 4.0 |
| supplementary characters in stopwords</li><li> As of 2.9, position increments are preserved</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.StopFilter.html">StopFilter</a></h4> |
| <section><p>Removes stop words from a token stream. |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> |
| compatibility when creating <a class="xref" href="Lucene.Net.Analysis.Core.StopFilter.html">StopFilter</a>: |
| <ul><li>As of 3.1, StopFilter correctly handles Unicode 4.0 |
| supplementary characters in stopwords and position |
| increments are preserved</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.StopFilterFactory.html">StopFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Core.StopFilter.html">StopFilter</a>.</p> |
| <pre><code><fieldType name="text_stop" class="solr.TextField" positionIncrementGap="100" autoGeneratePhraseQueries="true"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.StopFilterFactory" ignoreCase="true" |
| words="stopwords.txt" format="wordset" /> |
| </analyzer> |
| </fieldType></code></pre> |
| <p><p> |
| All attributes are optional: |
| </p> |
| <ul><li><code>ignoreCase</code> defaults to <code>false</code></li><li><code>words</code> should be the name of a stopwords file to parse, if not |
| specified the factory will use <a class="xref" href="Lucene.Net.Analysis.Core.StopAnalyzer.html#Lucene_Net_Analysis_Core_StopAnalyzer_ENGLISH_STOP_WORDS_SET">ENGLISH_STOP_WORDS_SET</a> |
| </li><li><code>format</code> defines how the <code>words</code> file will be parsed, |
| and defaults to <code>wordset</code>. If <code>words</code> is not specified, |
| then <code>format</code> must not be specified. |
| </li></ul> |
| <p> |
| The valid values for the <code>format</code> option are: |
| </p> |
| <ul><li><code>wordset</code> - This is the default format, which supports one word per |
| line (including any intra-word whitespace) and allows whole line comments |
| begining with the "#" character. Blank lines are ignored. See |
| <a class="xref" href="Lucene.Net.Analysis.Util.WordlistLoader.html#Lucene_Net_Analysis_Util_WordlistLoader_GetLines_System_IO_Stream_System_Text_Encoding_">GetLines(Stream, Encoding)</a> for details. |
| </li><li><code>snowball</code> - This format allows for multiple words specified on each |
| line, and trailing comments may be specified using the vertical line ("|"). |
| Blank lines are ignored. See |
| <a class="xref" href="Lucene.Net.Analysis.Util.WordlistLoader.html#Lucene_Net_Analysis_Util_WordlistLoader_GetSnowballWordSet_System_IO_TextReader_Lucene_Net_Util_LuceneVersion_">GetSnowballWordSet(TextReader, LuceneVersion)</a> |
| for details. |
| </li></ul></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.TypeTokenFilter.html">TypeTokenFilter</a></h4> |
| <section><p>Removes tokens whose types appear in a set of blocked types from a token stream.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.TypeTokenFilterFactory.html">TypeTokenFilterFactory</a></h4> |
| <section><p>Factory class for <a class="xref" href="Lucene.Net.Analysis.Core.TypeTokenFilter.html">TypeTokenFilter</a>.</p> |
| <pre><code><fieldType name="chars" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.StandardTokenizerFactory"/> |
| <filter class="solr.TypeTokenFilterFactory" types="stoptypes.txt" |
| useWhitelist="false"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.UpperCaseFilter.html">UpperCaseFilter</a></h4> |
| <section><p>Normalizes token text to UPPER CASE. |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> |
| compatibility when creating <a class="xref" href="Lucene.Net.Analysis.Core.UpperCaseFilter.html">UpperCaseFilter</a> |
| </p> |
| <p><strong>NOTE:</strong> In Unicode, this transformation may lose information when the |
| upper case character represents more than one lower case character. Use this filter |
| when you Require uppercase tokens. Use the <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a> for |
| general search matching |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.UpperCaseFilterFactory.html">UpperCaseFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Core.UpperCaseFilter.html">UpperCaseFilter</a>. </p> |
| <pre><code><fieldType name="text_uppercase" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.UpperCaseFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| |
| <p><strong>NOTE:</strong> In Unicode, this transformation may lose information when the |
| upper case character represents more than one lower case character. Use this filter |
| when you require uppercase tokens. Use the <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilterFactory.html">LowerCaseFilterFactory</a> for |
| general search matching |
| </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceAnalyzer.html">WhitespaceAnalyzer</a></h4> |
| <section><p>An <span class="xref">Lucene.Net.Analysis.Analyzer</span> that uses <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a>. |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> compatibility |
| when creating <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html">CharTokenizer</a>: |
| <ul><li>As of 3.1, <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a> uses an int based API to normalize and |
| detect token codepoints. See <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_IsTokenChar_System_Int32_">IsTokenChar(Int32)</a> and |
| <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_Normalize_System_Int32_">Normalize(Int32)</a> for details.</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a></h4> |
| <section><p>A <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a> is a tokenizer that divides text at whitespace. |
| Adjacent sequences of non-Whitespace characters form tokens. |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> compatibility when creating |
| <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a>: |
| <ul><li>As of 3.1, <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html">CharTokenizer</a> uses an int based API to normalize and |
| detect token characters. See <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_IsTokenChar_System_Int32_">IsTokenChar(Int32)</a> and |
| <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_Normalize_System_Int32_">Normalize(Int32)</a> for details.</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizerFactory.html">WhitespaceTokenizerFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a>. </p> |
| <pre><code><fieldType name="text_ws" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| </article> |
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