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| <h1 id="Lucene_Net_Analysis_Miscellaneous" data-uid="Lucene.Net.Analysis.Miscellaneous" class="text-break">Namespace Lucene.Net.Analysis.Miscellaneous |
| </h1> |
| <div class="markdown level0 summary"><!-- |
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| <p>Miscellaneous TokenStreams</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.Miscellaneous.ASCIIFoldingFilter.html">ASCIIFoldingFilter</a></h4> |
| <section><p>This class converts alphabetic, numeric, and symbolic Unicode characters |
| which are not in the first 127 ASCII characters (the "Basic Latin" Unicode |
| block) into their ASCII equivalents, if one exists. |
| <p> |
| Characters from the following Unicode blocks are converted; however, only |
| those characters with reasonable ASCII alternatives are converted:</p> |
| <p><ul> |
| <item>C1 Controls and Latin-1 Supplement: <a href="http://www.unicode.org/charts/PDF/U0080.pdf">http://www.unicode.org/charts/PDF/U0080.pdf</a></item> |
| <item>Latin Extended-A: <a href="http://www.unicode.org/charts/PDF/U0100.pdf">http://www.unicode.org/charts/PDF/U0100.pdf</a></item> |
| <item>Latin Extended-B: <a href="http://www.unicode.org/charts/PDF/U0180.pdf">http://www.unicode.org/charts/PDF/U0180.pdf</a></item> |
| <item>Latin Extended Additional: <a href="http://www.unicode.org/charts/PDF/U1E00.pdf">http://www.unicode.org/charts/PDF/U1E00.pdf</a></item> |
| <item>Latin Extended-C: <a href="http://www.unicode.org/charts/PDF/U2C60.pdf">http://www.unicode.org/charts/PDF/U2C60.pdf</a></item> |
| <item>Latin Extended-D: <a href="http://www.unicode.org/charts/PDF/UA720.pdf">http://www.unicode.org/charts/PDF/UA720.pdf</a></item> |
| <item>IPA Extensions: <a href="http://www.unicode.org/charts/PDF/U0250.pdf">http://www.unicode.org/charts/PDF/U0250.pdf</a></item> |
| <item>Phonetic Extensions: <a href="http://www.unicode.org/charts/PDF/U1D00.pdf">http://www.unicode.org/charts/PDF/U1D00.pdf</a></item> |
| <item>Phonetic Extensions Supplement: <a href="http://www.unicode.org/charts/PDF/U1D80.pdf">http://www.unicode.org/charts/PDF/U1D80.pdf</a></item> |
| <item>General Punctuation: <a href="http://www.unicode.org/charts/PDF/U2000.pdf">http://www.unicode.org/charts/PDF/U2000.pdf</a></item> |
| <item>Superscripts and Subscripts: <a href="http://www.unicode.org/charts/PDF/U2070.pdf">http://www.unicode.org/charts/PDF/U2070.pdf</a></item> |
| <item>Enclosed Alphanumerics: <a href="http://www.unicode.org/charts/PDF/U2460.pdf">http://www.unicode.org/charts/PDF/U2460.pdf</a></item> |
| <item>Dingbats: <a href="http://www.unicode.org/charts/PDF/U2700.pdf">http://www.unicode.org/charts/PDF/U2700.pdf</a></item> |
| <item>Supplemental Punctuation: <a href="http://www.unicode.org/charts/PDF/U2E00.pdf">http://www.unicode.org/charts/PDF/U2E00.pdf</a></item> |
| <item>Alphabetic Presentation Forms: <a href="http://www.unicode.org/charts/PDF/UFB00.pdf">http://www.unicode.org/charts/PDF/UFB00.pdf</a></item> |
| <item>Halfwidth and Fullwidth Forms: <a href="http://www.unicode.org/charts/PDF/UFF00.pdf">http://www.unicode.org/charts/PDF/UFF00.pdf</a></item> |
| </ul> |
| <p> |
| See: <a href="http://en.wikipedia.org/wiki/Latin_characters_in_Unicode">http://en.wikipedia.org/wiki/Latin_characters_in_Unicode</a> |
| <p> |
| For example, '&agrave;' will be replaced by 'a'.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilterFactory.html">ASCIIFoldingFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.html">ASCIIFoldingFilter</a>.</p> |
| <pre><code><fieldType name="text_ascii" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.ASCIIFoldingFilterFactory" preserveOriginal="false"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.CapitalizationFilter.html">CapitalizationFilter</a></h4> |
| <section><p>A filter to apply normal capitalization rules to Tokens. It will make the first letter |
| capital and the rest lower case. |
| <p> |
| This filter is particularly useful to build nice looking facet parameters. This filter |
| is not appropriate if you intend to use a prefix query.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.CapitalizationFilterFactory.html">CapitalizationFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.CapitalizationFilter.html">CapitalizationFilter</a>. |
| <p> |
| The factory takes parameters:<p> |
| "onlyFirstWord" - should each word be capitalized or all of the words?<p> |
| "keep" - a keep word list. Each word that should be kept separated by whitespace.<p> |
| "keepIgnoreCase - true or false. If true, the keep list will be considered case-insensitive.<p> |
| "forceFirstLetter" - Force the first letter to be capitalized even if it is in the keep list<p> |
| "okPrefix" - do not change word capitalization if a word begins with something in this list. |
| for example if "McK" is on the okPrefix list, the word "McKinley" should not be changed to |
| "Mckinley"<p> |
| "minWordLength" - how long the word needs to be to get capitalization applied. If the |
| minWordLength is 3, "and" > "And" but "or" stays "or"<p> |
| "maxWordCount" - if the token contains more then maxWordCount words, the capitalization is |
| assumed to be correct.<p> |
| <pre><code><fieldType name="text_cptlztn" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.CapitalizationFilterFactory" onlyFirstWord="true" |
| keep="java solr lucene" keepIgnoreCase="false" |
| okPrefix="McK McD McA"/> |
| </analyzer> |
| </fieldType></code></pre> |
| |
| <p>@since solr 1.3</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.CodepointCountFilter.html">CodepointCountFilter</a></h4> |
| <section><p>Removes words that are too long or too short from the stream. |
| <p> |
| Note: Length is calculated as the number of Unicode codepoints. |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.CodepointCountFilterFactory.html">CodepointCountFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.CodepointCountFilter.html">CodepointCountFilter</a>. </p> |
| <pre><code><fieldType name="text_lngth" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.CodepointCountFilterFactory" min="0" max="1" /> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.EmptyTokenStream.html">EmptyTokenStream</a></h4> |
| <section><p>An always exhausted token stream.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.HyphenatedWordsFilter.html">HyphenatedWordsFilter</a></h4> |
| <section><p>When the plain text is extracted from documents, we will often have many words hyphenated and broken into |
| two lines. This is often the case with documents where narrow text columns are used, such as newsletters. |
| In order to increase search efficiency, this filter puts hyphenated words broken into two lines back together. |
| This filter should be used on indexing time only. |
| Example field definition in schema.xml:</p> |
| <pre><code><fieldtype name="text" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer type="index"> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.SynonymFilterFactory" synonyms="index_synonyms.txt" ignoreCase="true" expand="false"/> |
| <filter class="solr.StopFilterFactory" ignoreCase="true"/> |
| <filter class="solr.HyphenatedWordsFilterFactory"/> |
| <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="0"/> |
| <filter class="solr.LowerCaseFilterFactory"/> |
| <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> |
| </analyzer> |
| <analyzer type="query"> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/> |
| <filter class="solr.StopFilterFactory" ignoreCase="true"/> |
| <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="0" catenateNumbers="0" catenateAll="0"/> |
| <filter class="solr.LowerCaseFilterFactory"/> |
| <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> |
| </analyzer> |
| </fieldtype></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.HyphenatedWordsFilterFactory.html">HyphenatedWordsFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.HyphenatedWordsFilter.html">HyphenatedWordsFilter</a>.</p> |
| <pre><code><fieldType name="text_hyphn" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.HyphenatedWordsFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeepWordFilter.html">KeepWordFilter</a></h4> |
| <section><p>A <span class="xref">Lucene.Net.Analysis.TokenFilter</span> that only keeps tokens with text contained in the |
| required words. This filter behaves like the inverse of <a class="xref" href="Lucene.Net.Analysis.Core.StopFilter.html">StopFilter</a>.</p> |
| <p>@since solr 1.3</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeepWordFilterFactory.html">KeepWordFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeepWordFilter.html">KeepWordFilter</a>. </p> |
| <pre><code><fieldType name="text_keepword" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.KeepWordFilterFactory" words="keepwords.txt" ignoreCase="false"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeywordMarkerFilter.html">KeywordMarkerFilter</a></h4> |
| <section><p>Marks terms as keywords via the <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html">KeywordAttribute</a>.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeywordMarkerFilterFactory.html">KeywordMarkerFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeywordMarkerFilter.html">KeywordMarkerFilter</a>.</p> |
| <pre><code><fieldType name="text_keyword" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.KeywordMarkerFilterFactory" protected="protectedkeyword.txt" pattern="^.+er$" ignoreCase="false"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeywordRepeatFilter.html">KeywordRepeatFilter</a></h4> |
| <section><p>This TokenFilter emits each incoming token twice once as keyword and once non-keyword, in other words once with |
| <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html#Lucene_Net_Analysis_TokenAttributes_KeywordAttribute_IsKeyword">IsKeyword</a> set to <code>true</code> and once set to <code>false</code>. |
| This is useful if used with a stem filter that respects the <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html">KeywordAttribute</a> to index the stemmed and the |
| un-stemmed version of a term into the same field.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeywordRepeatFilterFactory.html">KeywordRepeatFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeywordRepeatFilter.html">KeywordRepeatFilter</a>.</p> |
| <p>Since <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.KeywordRepeatFilter.html">KeywordRepeatFilter</a> emits two tokens for every input token, and any tokens that aren't transformed |
| later in the analysis chain will be in the document twice. Therefore, consider adding |
| <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.RemoveDuplicatesTokenFilterFactory.html">RemoveDuplicatesTokenFilterFactory</a> later in the analysis chain.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LengthFilter.html">LengthFilter</a></h4> |
| <section><p>Removes words that are too long or too short from the stream. |
| <p> |
| Note: Length is calculated as the number of UTF-16 code units. |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LengthFilterFactory.html">LengthFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LengthFilter.html">LengthFilter</a>. </p> |
| <pre><code><fieldType name="text_lngth" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.LengthFilterFactory" min="0" max="1" /> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountAnalyzer.html">LimitTokenCountAnalyzer</a></h4> |
| <section><p>This <span class="xref">Lucene.Net.Analysis.Analyzer</span> limits the number of tokens while indexing. It is |
| a replacement for the maximum field length setting inside <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.IndexWriter.html">IndexWriter</a>. </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilter.html">LimitTokenCountFilter</a></h4> |
| <section><p>This <span class="xref">Lucene.Net.Analysis.TokenFilter</span> limits the number of tokens while indexing. It is |
| a replacement for the maximum field length setting inside <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.IndexWriter.html">IndexWriter</a>. |
| <p> |
| By default, this filter ignores any tokens in the wrapped <span class="xref">Lucene.Net.Analysis.TokenStream</span> |
| once the limit has been reached, which can result in <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilter.html#Lucene_Net_Analysis_Miscellaneous_LimitTokenCountFilter_Reset">Reset()</a> being |
| called prior to <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilter.html#Lucene_Net_Analysis_Miscellaneous_LimitTokenCountFilter_IncrementToken">IncrementToken()</a> returning <code>false</code>. For most |
| <span class="xref">Lucene.Net.Analysis.TokenStream</span> implementations this should be acceptable, and faster |
| then consuming the full stream. If you are wrapping a <span class="xref">Lucene.Net.Analysis.TokenStream</span> |
| which requires that the full stream of tokens be exhausted in order to |
| function properly, use the |
| <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilter.html#Lucene_Net_Analysis_Miscellaneous_LimitTokenCountFilter__ctor_Lucene_Net_Analysis_TokenStream_System_Int32_System_Boolean_">LimitTokenCountFilter(TokenStream, Int32, Boolean)</a> consumeAllTokens |
| option. |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilterFactory.html">LimitTokenCountFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilter.html">LimitTokenCountFilter</a>. </p> |
| <pre><code><fieldType name="text_lngthcnt" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.LimitTokenCountFilterFactory" maxTokenCount="10" consumeAllTokens="false" /> |
| </analyzer> |
| </fieldType></code></pre> |
| <p> |
| The <span class="xref">Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilterFactory.consumeAllTokens</span> property is optional and defaults to <code>false</code>.<br>See <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenCountFilter.html">LimitTokenCountFilter</a> for an explanation of it's use. |
| </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilter.html">LimitTokenPositionFilter</a></h4> |
| <section><p>This <span class="xref">Lucene.Net.Analysis.TokenFilter</span> limits its emitted tokens to those with positions that |
| are not greater than the configured limit. |
| <p> |
| By default, this filter ignores any tokens in the wrapped <span class="xref">Lucene.Net.Analysis.TokenStream</span> |
| once the limit has been exceeded, which can result in <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilter.html#Lucene_Net_Analysis_Miscellaneous_LimitTokenPositionFilter_Reset">Reset()</a> being |
| called prior to <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilter.html#Lucene_Net_Analysis_Miscellaneous_LimitTokenPositionFilter_IncrementToken">IncrementToken()</a> returning <code>false</code>. For most |
| <span class="xref">Lucene.Net.Analysis.TokenStream</span> implementations this should be acceptable, and faster |
| then consuming the full stream. If you are wrapping a <span class="xref">Lucene.Net.Analysis.TokenStream</span> |
| which requires that the full stream of tokens be exhausted in order to |
| function properly, use the |
| <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilter.html#Lucene_Net_Analysis_Miscellaneous_LimitTokenPositionFilter__ctor_Lucene_Net_Analysis_TokenStream_System_Int32_System_Boolean_">LimitTokenPositionFilter(TokenStream, Int32, Boolean)</a> consumeAllTokens |
| option. |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilterFactory.html">LimitTokenPositionFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilter.html">LimitTokenPositionFilter</a>. </p> |
| <pre><code><fieldType name="text_limit_pos" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.LimitTokenPositionFilterFactory" maxTokenPosition="3" consumeAllTokens="false" /> |
| </analyzer> |
| </fieldType></code></pre> |
| <p> |
| The <span class="xref">Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilterFactory.consumeAllTokens</span> property is optional and defaults to <code>false</code>.<br>See <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.LimitTokenPositionFilter.html">LimitTokenPositionFilter</a> for an explanation of its use. |
| </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.Lucene47WordDelimiterFilter.html">Lucene47WordDelimiterFilter</a></h4> |
| <section><p>Old Broken version of <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.html">WordDelimiterFilter</a></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PatternAnalyzer.html">PatternAnalyzer</a></h4> |
| <section><p>Efficient Lucene analyzer/tokenizer that preferably operates on a <span class="xref">System.String</span> rather than a |
| <span class="xref">System.IO.TextReader</span>, that can flexibly separate text into terms via a regular expression <span class="xref">System.Text.RegularExpressions.Regex</span> |
| (with behaviour similar to <span class="xref">System.Text.RegularExpressions.Regex.Split(System.String)</span>), |
| and that combines the functionality of |
| <a class="xref" href="Lucene.Net.Analysis.Core.LetterTokenizer.html">LetterTokenizer</a>, |
| <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseTokenizer.html">LowerCaseTokenizer</a>, |
| <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a>, |
| <a class="xref" href="Lucene.Net.Analysis.Core.StopFilter.html">StopFilter</a> into a single efficient |
| multi-purpose class. |
| <p> |
| If you are unsure how exactly a regular expression should look like, consider |
| prototyping by simply trying various expressions on some test texts via |
| <span class="xref">System.Text.RegularExpressions.Regex.Split(System.String)</span>. Once you are satisfied, give that regex to |
| <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PatternAnalyzer.html">PatternAnalyzer</a>. Also see <a target="_blank" href="http://www.regular-expressions.info/">Regular Expression Tutorial</a>. |
| </p> |
| <p> |
| This class can be considerably faster than the "normal" Lucene tokenizers. |
| It can also serve as a building block in a compound Lucene |
| <span class="xref">Lucene.Net.Analysis.TokenFilter</span> chain. For example as in this |
| stemming example:</p> |
| <pre><code>PatternAnalyzer pat = ... |
| TokenStream tokenStream = new SnowballFilter( |
| pat.GetTokenStream("content", "James is running round in the woods"), |
| "English"));</code></pre> |
| <p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PatternKeywordMarkerFilter.html">PatternKeywordMarkerFilter</a></h4> |
| <section><p>Marks terms as keywords via the <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html">KeywordAttribute</a>. Each token |
| that matches the provided pattern is marked as a keyword by setting |
| <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html#Lucene_Net_Analysis_TokenAttributes_KeywordAttribute_IsKeyword">IsKeyword</a> to <code>true</code>.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PerFieldAnalyzerWrapper.html">PerFieldAnalyzerWrapper</a></h4> |
| <section><p>This analyzer is used to facilitate scenarios where different |
| fields Require different analysis techniques. Use the Map |
| argument in <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PerFieldAnalyzerWrapper.html#Lucene_Net_Analysis_Miscellaneous_PerFieldAnalyzerWrapper__ctor_Lucene_Net_Analysis_Analyzer_System_Collections_Generic_IDictionary_System_String_Lucene_Net_Analysis_Analyzer__">PerFieldAnalyzerWrapper(Analyzer, IDictionary<String, Analyzer>)</a> |
| to add non-default analyzers for fields.</p> |
| <p>Example usage: |
| |
| <pre><code>IDictionary<string, Analyzer> analyzerPerField = new Dictionary<string, Analyzer>(); |
| analyzerPerField["firstname"] = new KeywordAnalyzer(); |
| analyzerPerField["lastname"] = new KeywordAnalyzer(); |
| |
| PerFieldAnalyzerWrapper aWrapper = |
| new PerFieldAnalyzerWrapper(new StandardAnalyzer(version), analyzerPerField);</code></pre> |
| </p> |
| <p> |
| In this example, <a class="xref" href="Lucene.Net.Analysis.Standard.StandardAnalyzer.html">StandardAnalyzer</a> will be used for all fields except "firstname" |
| and "lastname", for which <a class="xref" href="Lucene.Net.Analysis.Core.KeywordAnalyzer.html">KeywordAnalyzer</a> will be used. |
| </p> |
| <p>A <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PerFieldAnalyzerWrapper.html">PerFieldAnalyzerWrapper</a> can be used like any other analyzer, for both indexing |
| and query parsing. |
| </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PrefixAndSuffixAwareTokenFilter.html">PrefixAndSuffixAwareTokenFilter</a></h4> |
| <section><p>Links two <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PrefixAwareTokenFilter.html">PrefixAwareTokenFilter</a>. |
| <p> |
| <strong>NOTE:</strong> This filter might not behave correctly if used with custom |
| <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.IAttribute.html">IAttribute</a>s, i.e. <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.IAttribute.html">IAttribute</a>s other than |
| the ones located in Lucene.Net.Analysis.TokenAttributes. </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.PrefixAwareTokenFilter.html">PrefixAwareTokenFilter</a></h4> |
| <section><p>Joins two token streams and leaves the last token of the first stream available |
| to be used when updating the token values in the second stream based on that token.</p> |
| <p>The default implementation adds last prefix token end offset to the suffix token start and end offsets. |
| <p> |
| <strong>NOTE:</strong> This filter might not behave correctly if used with custom |
| <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.IAttribute.html">IAttribute</a>s, i.e. <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.IAttribute.html">IAttribute</a>s other than |
| the ones located in Lucene.Net.Analysis.TokenAttributes.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.RemoveDuplicatesTokenFilter.html">RemoveDuplicatesTokenFilter</a></h4> |
| <section><p>A <span class="xref">Lucene.Net.Analysis.TokenFilter</span> which filters out <span class="xref">Lucene.Net.Analysis.Token</span>s at the same position and Term text as the previous token in the stream.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.RemoveDuplicatesTokenFilterFactory.html">RemoveDuplicatesTokenFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.RemoveDuplicatesTokenFilter.html">RemoveDuplicatesTokenFilter</a>.</p> |
| <pre><code><fieldType name="text_rmdup" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianFoldingFilter.html">ScandinavianFoldingFilter</a></h4> |
| <section><p>This filter folds Scandinavian characters åÅäæÄÆ->a and öÖøØ->o. |
| It also discriminate against use of double vowels aa, ae, ao, oe and oo, leaving just the first one. |
| <p> |
| It's is a semantically more destructive solution than <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianNormalizationFilter.html">ScandinavianNormalizationFilter</a> but |
| can in addition help with matching raksmorgas as räksmörgås. |
| <p> |
| blåbærsyltetøj == blåbärsyltetöj == blaabaarsyltetoej == blabarsyltetoj |
| räksmörgås == ræksmørgås == ræksmörgaos == raeksmoergaas == raksmorgas |
| <p> |
| Background: |
| Swedish åäö are in fact the same letters as Norwegian and Danish åæø and thus interchangeable |
| when used between these languages. They are however folded differently when people type |
| them on a keyboard lacking these characters. |
| <p> |
| In that situation almost all Swedish people use a, a, o instead of å, ä, ö. |
| <p> |
| Norwegians and Danes on the other hand usually type aa, ae and oe instead of å, æ and ø. |
| Some do however use a, a, o, oo, ao and sometimes permutations of everything above. |
| <p> |
| This filter solves that mismatch problem, but might also cause new.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianFoldingFilterFactory.html">ScandinavianFoldingFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianFoldingFilter.html">ScandinavianFoldingFilter</a>.</p> |
| <pre><code><fieldType name="text_scandfold" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.ScandinavianFoldingFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianNormalizationFilter.html">ScandinavianNormalizationFilter</a></h4> |
| <section><p>This filter normalize use of the interchangeable Scandinavian characters æÆäÄöÖøØ |
| and folded variants (aa, ao, ae, oe and oo) by transforming them to åÅæÆøØ. |
| <p> |
| It's a semantically less destructive solution than <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianFoldingFilter.html">ScandinavianFoldingFilter</a>, |
| most useful when a person with a Norwegian or Danish keyboard queries a Swedish index |
| and vice versa. This filter does <strong>not</strong> the common Swedish folds of å and ä to a nor ö to o. |
| <p> |
| blåbærsyltetøj == blåbärsyltetöj == blaabaarsyltetoej but not blabarsyltetoj |
| räksmörgås == ræksmørgås == ræksmörgaos == raeksmoergaas but not raksmorgas</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianNormalizationFilterFactory.html">ScandinavianNormalizationFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ScandinavianNormalizationFilter.html">ScandinavianNormalizationFilter</a>.</p> |
| <pre><code><fieldType name="text_scandnorm" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.ScandinavianNormalizationFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.SetKeywordMarkerFilter.html">SetKeywordMarkerFilter</a></h4> |
| <section><p>Marks terms as keywords via the <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html">KeywordAttribute</a>. Each token |
| contained in the provided set is marked as a keyword by setting |
| <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html#Lucene_Net_Analysis_TokenAttributes_KeywordAttribute_IsKeyword">IsKeyword</a> to <code>true</code>.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.SingleTokenTokenStream.html">SingleTokenTokenStream</a></h4> |
| <section><p>A <span class="xref">Lucene.Net.Analysis.TokenStream</span> containing a single token.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.StemmerOverrideFilter.html">StemmerOverrideFilter</a></h4> |
| <section><p>Provides the ability to override any <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html">KeywordAttribute</a> aware stemmer |
| with custom dictionary-based stemming.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.StemmerOverrideFilter.Builder.html">StemmerOverrideFilter.Builder</a></h4> |
| <section><p>This builder builds an <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.Fst.FST.html">FST</a> for the <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.StemmerOverrideFilter.html">StemmerOverrideFilter</a></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.StemmerOverrideFilter.StemmerOverrideMap.html">StemmerOverrideFilter.StemmerOverrideMap</a></h4> |
| <section><p>A read-only 4-byte FST backed map that allows fast case-insensitive key |
| value lookups for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.StemmerOverrideFilter.html">StemmerOverrideFilter</a></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.StemmerOverrideFilterFactory.html">StemmerOverrideFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.StemmerOverrideFilter.html">StemmerOverrideFilter</a>.</p> |
| <pre><code><fieldType name="text_dicstem" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.StemmerOverrideFilterFactory" dictionary="dictionary.txt" ignoreCase="false"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.TrimFilter.html">TrimFilter</a></h4> |
| <section><p>Trims leading and trailing whitespace from Tokens in the stream. |
| <p>As of Lucene 4.4, this filter does not support updateOffsets=true anymore |
| as it can lead to broken token streams. |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.TrimFilterFactory.html">TrimFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.TrimFilter.html">TrimFilter</a>.</p> |
| <pre><code><fieldType name="text_trm" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.NGramTokenizerFactory"/> |
| <filter class="solr.TrimFilterFactory" /> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.TruncateTokenFilter.html">TruncateTokenFilter</a></h4> |
| <section><p>A token filter for truncating the terms into a specific length. |
| Fixed prefix truncation, as a stemming method, produces good results on Turkish language. |
| It is reported that F5, using first 5 characters, produced best results in |
| <a href="http://www.users.muohio.edu/canf/papers/JASIST2008offPrint.pdf"> |
| Information Retrieval on Turkish Texts</a></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.TruncateTokenFilterFactory.html">TruncateTokenFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.TruncateTokenFilter.html">TruncateTokenFilter</a>. The following type is recommended for "<em>diacritics-insensitive search</em>" for Turkish.</p> |
| <pre><code><fieldType name="text_tr_ascii_f5" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.StandardTokenizerFactory"/> |
| <filter class="solr.ApostropheFilterFactory"/> |
| <filter class="solr.TurkishLowerCaseFilterFactory"/> |
| <filter class="solr.ASCIIFoldingFilterFactory" preserveOriginal="true"/> |
| <filter class="solr.KeywordRepeatFilterFactory"/> |
| <filter class="solr.TruncateTokenFilterFactory" prefixLength="5"/> |
| <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.html">WordDelimiterFilter</a></h4> |
| <section><p>Splits words into subwords and performs optional transformations on subword |
| groups. Words are split into subwords with the following rules: |
| <ul><li>split on intra-word delimiters (by default, all non alpha-numeric |
| characters): <code>"Wi-Fi"</code> → <code>"Wi", "Fi"</code></li><li>split on case transitions: <code>"PowerShot"</code> → |
| <code>"Power", "Shot"</code></li><li>split on letter-number transitions: <code>"SD500"</code> → |
| <code>"SD", "500"</code></li><li>leading and trailing intra-word delimiters on each subword are ignored: |
| <code>"//hello---there, 'dude'"</code> → |
| <code>"hello", "there", "dude"</code></li><li>trailing "'s" are removed for each subword: <code>"O'Neil's"</code> |
| → <code>"O", "Neil"</code> |
| <ul> |
| <item>Note: this step isn't performed in a separate filter because of possible |
| subword combinations.</item> |
| </ul> |
| </li></ul> |
| <p> |
| The <strong>combinations</strong> parameter affects how subwords are combined: |
| <ul><li>combinations="0" causes no subword combinations: <pre><code>"PowerShot"</code></pre> |
| → <code>0:"Power", 1:"Shot"</code> (0 and 1 are the token positions)</li><li>combinations="1" means that in addition to the subwords, maximum runs of |
| non-numeric subwords are catenated and produced at the same position of the |
| last subword in the run: |
| <ul> |
| <item><code>"PowerShot"</code> → |
| <code>0:"Power", 1:"Shot" 1:"PowerShot"</code></item> |
| <item><code>"A's+B's&C's"</code> -gt; <code>0:"A", 1:"B", 2:"C", 2:"ABC"</code> |
| </item> |
| <item><code>"Super-Duper-XL500-42-AutoCoder!"</code> → |
| <code>0:"Super", 1:"Duper", 2:"XL", 2:"SuperDuperXL", 3:"500" 4:"42", 5:"Auto", 6:"Coder", 6:"AutoCoder"</code> |
| </item> |
| </ul> |
| </li></ul> |
| <p> |
| One use for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.html">WordDelimiterFilter</a> is to help match words with different |
| subword delimiters. For example, if the source text contained "wi-fi" one may |
| want "wifi" "WiFi" "wi-fi" "wi+fi" queries to all match. One way of doing so |
| is to specify combinations="1" in the analyzer used for indexing, and |
| combinations="0" (the default) in the analyzer used for querying. Given that |
| the current <a class="xref" href="Lucene.Net.Analysis.Standard.StandardTokenizer.html">StandardTokenizer</a> immediately removes many intra-word |
| delimiters, it is recommended that this filter be used after a tokenizer that |
| does not do this (such as <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a>).</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilterFactory.html">WordDelimiterFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.html">WordDelimiterFilter</a>.</p> |
| <pre><code><fieldType name="text_wd" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| <filter class="solr.WordDelimiterFilterFactory" protected="protectedword.txt" |
| preserveOriginal="0" splitOnNumerics="1" splitOnCaseChange="1" |
| catenateWords="0" catenateNumbers="0" catenateAll="0" |
| generateWordParts="1" generateNumberParts="1" stemEnglishPossessive="1" |
| types="wdfftypes.txt" /> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterIterator.html">WordDelimiterIterator</a></h4> |
| <section><p>A BreakIterator-like API for iterating over subwords in text, according to <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.html">WordDelimiterFilter</a> rules.</p> |
| <div class="lucene-block lucene-internal">This is a Lucene.NET INTERNAL API, use at your own risk</div></section> |
| <h3 id="enums">Enums |
| </h3> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFlags.html">WordDelimiterFlags</a></h4> |
| <section><p>Configuration options for the <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.html">WordDelimiterFilter</a>. |
| <p> |
| LUCENENET specific - these options were passed as int constant flags in Lucene.</p> |
| </section> |
| </article> |
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