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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1581) LowerCaseFilter should be able to be configured to use a specific locale.
Date Tue, 16 Jun 2009 19:09:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720300#action_12720300
] 

Robert Muir commented on LUCENE-1581:
-------------------------------------

you *could* add the JDK collation key filter to core if you wanted a core fix.

but the icu one is up to something like 30x faster than the jdk, so why bother :)

> LowerCaseFilter should be able to be configured to use a specific locale.
> -------------------------------------------------------------------------
>
>                 Key: LUCENE-1581
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1581
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Digy
>         Attachments: TestTurkishCollation.java
>
>
> //Since I am a .Net programmer, Sample codes will be in c# but I don't think that it
would be a problem to understand them.
> //
> Assume an input text like "İ" and and analyzer like below
> {code}
> 	public class SomeAnalyzer : Analyzer
>     	{
> 		public override TokenStream TokenStream(string fieldName, System.IO.TextReader reader)
> 	        {
>             		TokenStream t = new SomeTokenizer(reader);
> 		        t = new Lucene.Net.Analysis.ASCIIFoldingFilter(t);
> 			t = new LowerCaseFilter(t);
> 		        return t;
> 		}
>         
>     	}
> {code}
> 	
> ASCIIFoldingFilter will return "I" and after, LowerCaseFilter will return
> 	"i" (if locale is "en-US") 
> 	or 
> 	"ı' if(locale is "tr-TR") (that means,this token should be input to another instance
of ASCIIFoldingFilter)
> So, calling LowerCaseFilter before ASCIIFoldingFilter would be a solution, but a better
approach can be adding
> a new constructor to LowerCaseFilter and forcing it to use a specific locale.
> {code}
>     public sealed class LowerCaseFilter : TokenFilter
>     {
>         /* +++ */System.Globalization.CultureInfo CultureInfo = System.Globalization.CultureInfo.CurrentCulture;
>         public LowerCaseFilter(TokenStream in) : base(in)
>         {
>         }
>         /* +++ */  public LowerCaseFilter(TokenStream in, System.Globalization.CultureInfo
CultureInfo) : base(in)
>         /* +++ */  {
>         /* +++ */      this.CultureInfo = CultureInfo;
>         /* +++ */  }
> 		
>         public override Token Next(Token result)
>         {
>             result = Input.Next(result);
>             if (result != null)
>             {
>                 char[] buffer = result.TermBuffer();
>                 int length = result.termLength;
>                 for (int i = 0; i < length; i++)
>                     /* +++ */ buffer[i] = System.Char.ToLower(buffer[i],CultureInfo);
>                 return result;
>             }
>             else
>                 return null;
>         }
>     }
> {code}
> DIGY

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