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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2009/06/13 04:38:07 UTC
[jira] Updated: (LUCENE-1581) LowerCaseFilter should be able to be
configured to use a specific locale.
[ https://issues.apache.org/jira/browse/LUCENE-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Muir updated LUCENE-1581:
--------------------------------
Attachment: TestTurkishCollation.java
i've attached a testcase showing how the collation filters in contrib solve your problem.
I think its the best way to get locale-specific matching behavior when you know the locale: case differences, normalization, accents, the whole shebang.
just set the strength and locale appropriately
> 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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