Re: [Exist-open] Lucene custom analyzer

[Dannes W. <di...@ex...>]

Hi,

I think you need to register the jar in EXIST_HOME/etc/launcher.xml 

Cheers

Dannes


> On 4 Dec 2024, at 12:55, Irene Vagionakis <ire...@pa...bh> wrote:
> 
> 
> Hi there!
>  
> I am trying to add a custom Lucene analyzer that behaves like the WhitespaceAnalyzer concerning tokenization and (lack of) stemming, but that is also case-insensitive (basically the same of https://sourceforge.net/p/exist/mailman/message/35188378/).
>  
> I followed what suggested in the post thread above, that is writing the custom analyzer, compiling its class as JAR and saving it in $EXIST_HOME/lib/user, but it is not working. I tried also putting it in the same folder of the other Lucene JAR files, but the same.
>  
> Since both my Java/Lucene and eXist-db knowledge are quite poor, I am struggling to figure out whether the problem concerns my code or has to do with eXist-db itself. 
>  
> This is my custom analyzer code:
>  
> package org.custom;
> import org.apache.lucene.analysis.Analyzer;
> import org.apache.lucene.analysis.TokenStream;
> import org.apache.lucene.analysis.core.LowerCaseFilter;
> import org.apache.lucene.analysis.core.WhitespaceTokenizer;
> public class CaseInsensitiveWhitespaceAnalyzer extends Analyzer {
>     @Override
>     protected TokenStreamComponents createComponents(String fieldName) {
>         final WhitespaceTokenizer source = new WhitespaceTokenizer();
>         final TokenStream filter = new LowerCaseFilter(source);
>         return new TokenStreamComponents(source, filter);
>     }
> }
>  
> And this is how I reference to it in collection.xconf:
> <analyzer id="custom" class="org.custom.CaseInsensitiveWhitespaceAnalyzer"/>
>  
> I also tested the analyzer outside eXist-db with the following and it returned the expected tokens:
>  
> import org.apache.lucene.analysis.Analyzer;
> import org.apache.lucene.analysis.TokenStream;
> import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
> import org.custom.CaseInsensitiveWhitespaceAnalyzer;
> import java.io.IOException;
> import java.io.StringReader;
> public class TestAnalyzer {
>     public static void main(String[] args) throws IOException {
>         String text = "Lucene is a Simple1 123 5% _test - Yet Powerful - Java Based Search Library. I love IT!";
>         Analyzer analyzer = new CaseInsensitiveWhitespaceAnalyzer();
>         try (TokenStream tokenStream = analyzer.tokenStream("field", new StringReader(text))) {
>             CharTermAttribute charTermAttribute = tokenStream.addAttribute(CharTermAttribute.class);
>             tokenStream.reset();
>             while (tokenStream.incrementToken()) {
>                 System.out.println(charTermAttribute.toString());
>             }
>             tokenStream.end();
>         }
>     }
> }
>  
> What am I doing wrong? Any suggestions/hints will be highly appreciated :)
>  
> Thanks,
> Irene
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