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From java8964 java8964 <java8...@hotmail.com>
Subject RE: During the wild card search, will lucene 2.9.0 to convert the search string to lower case?
Date Wed, 03 Feb 2010 15:07:15 GMT

Thanks for your help.

My concern now is that the field could be defined as store. So when the user receive the field
data, we want to still show the original data, in upper case in this case.

First, I don't think I can use queryParser.SetLowercaseExpandedTerms(false), which will remove
the wildcard search case insensitive functionality for tokenized field.

To handle this case, if the data is NOT tokenized, but contain upper case data, to be able
do the wildcard search with uppercase letter, like 'BB*', I am thinking that I have to analyzer
the non tokenized data, using a KeywordTokenizer plus lowercase the data.

For your suggestion, will the data change to lower case and stored in the lucene when it being
retrieved?

Thanks

> From: uwe@thetaphi.de
> To: java-user@lucene.apache.org
> Subject: RE: During the wild card search, will lucene 2.9.0 to convert the 	search string
to lower case?
> Date: Wed, 3 Feb 2010 11:17:27 +0100
> 
> For specific fields using a special TokenStream chain, there is no need to write a separate
analyzer. You can add fields to a document using a TokenStream as parameter: new Field(name,
TokenStream).
> 
> As TokenStream just create a chain from Tokenizer and all Filters like:
> 
> TokenStream ts = new KeywordTokenizer(new StringReader("your text to index"));
> ts = new LowercaseFilter(ts);
> ...
> document.add("fieldname", ts);
> 
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
> 
> 
> > -----Original Message-----
> > From: Ian Lea [mailto:ian.lea@gmail.com]
> > Sent: Wednesday, February 03, 2010 11:06 AM
> > To: java-user@lucene.apache.org
> > Subject: Re: During the wild card search, will lucene 2.9.0 to convert
> > the search string to lower case?
> > 
> > I think you'll have to write your own.  Or just downcase the text
> > yourself first.
> > 
> > 
> > --
> > Ian.
> > 
> > 
> > On Tue, Feb 2, 2010 at 9:30 PM, java8964 java8964
> > <java8964@hotmail.com> wrote:
> > >
> > > Is there an analyzer like keyword analyzer, but will also lowering
> > the data from lucene? Or I have to do a customer analyzer by myself?
> > >
> > > Thanks
> > >
> > >> From: java8964@hotmail.com
> > >> To: java-user@lucene.apache.org
> > >> Subject: RE: During the wild card search, will lucene 2.9.0 to
> > convert the search string to lower case?
> > >> Date: Mon, 1 Feb 2010 14:24:00 -0500
> > >>
> > >>
> > >> This is maybe something I am looking for. We are using the default
> > value, which is true.
> > >>
> > >> Let me examine this method more.
> > >>
> > >> Thanks for your help.
> > >>
> > >> > From: digydigy@gmail.com
> > >> > To: java-user@lucene.apache.org
> > >> > Subject: RE: During the wild card search, will lucene 2.9.0 to
> > convert the search string to lower case?
> > >> > Date: Mon, 1 Feb 2010 20:36:29 +0200
> > >> >
> > >> > Did you try queryParser.SetLowercaseExpandedTerms(false)?
> > >> >
> > >> > DIGY
> > >> >
> > >> > -----Original Message-----
> > >> > From: java8964 java8964 [mailto:java8964@hotmail.com]
> > >> > Sent: Monday, February 01, 2010 8:11 PM
> > >> > To: java-user@lucene.apache.org
> > >> > Subject: RE: During the wild card search, will lucene 2.9.0 to
> > convert the
> > >> > search string to lower case?
> > >> >
> > >> >
> > >> > I would like to confirm your reply. You mean that the query parse
> > will lower
> > >> > casing. In fact, it looks like that it only does this for wild
> > card query,
> > >> > right?
> > >> >
> > >> > For the term query, it didn't. As proved by if you change the line
> > to:
> > >> >
> > >> >             Query query = new QueryParser("title",
> > >> > wrapper).parse("title:\"BBB CCC\"");
> > >> >
> > >> > You will get 1 hits back. So in this case, the query parser class
> > did in
> > >> > different way for term query and wild card query.
> > >> >
> > >> > We have to use the query parse in this case, but we have our own
> > Query
> > >> > parser class extends from the lucene query parser class. Anything
> > we can do
> > >> > to about it?
> > >> >
> > >> > Will lucense's query parser class be fixed for the above
> > inconsistent
> > >> > implementation?
> > >> >
> > >> > Thanks
> > >> >
> > >> >
> > >> > > From: uwe@thetaphi.de
> > >> > > To: java-user@lucene.apache.org
> > >> > > Subject: RE: During the wild card search, will lucene 2.9.0 to
> > convert the
> > >> > search string to lower case?
> > >> > > Date: Mon, 1 Feb 2010 17:41:08 +0100
> > >> > >
> > >> > > Only query parser does the lower casing. For such a special
> > case, I would
> > >> > suggest to use a PrefixQuery or WildcardQuery directly and not use
> > query
> > >> > parser.
> > >> > >
> > >> > > -----
> > >> > > Uwe Schindler
> > >> > > H.-H.-Meier-Allee 63, D-28213 Bremen
> > >> > > http://www.thetaphi.de
> > >> > > eMail: uwe@thetaphi.de
> > >> > >
> > >> > > > -----Original Message-----
> > >> > > > From: java8964 java8964 [mailto:java8964@hotmail.com]
> > >> > > > Sent: Monday, February 01, 2010 5:27 PM
> > >> > > > To: java-user@lucene.apache.org
> > >> > > > Subject: During the wild card search, will lucene 2.9.0
to
> > convert the
> > >> > > > search string to lower case?
> > >> > > >
> > >> > > >
> > >> > > > I noticed a strange result from the following test case.
For
> > wildcard
> > >> > > > search, my understanding is that lucene will NOT use any
> > analyzer on
> > >> > > > the query string. But as the following simple code to show,
it
> > looks
> > >> > > > like that lucene will lower case the search query in the
> > wildcard
> > >> > > > search. Why? If not, why the following test case show the
> > search hits
> > >> > > > as one for lower case wildcard search, but not for the upper
> > case data?
> > >> > > > My original data is NOT analyzed, so they should be stored
as
> > the
> > >> > > > original data in the index segment, right?
> > >> > > >
> > >> > > > Lucene version: 2.9.0
> > >> > > >
> > >> > > > JDK version: JDK 1.6.0_17
> > >> > > >
> > >> > > >
> > >> > > > public class IndexTest1 {
> > >> > > >     public static void main(String[] args) {
> > >> > > >         try {
> > >> > > >             Directory directory = new RAMDirectory();
> > >> > > >             IndexWriter writer = new IndexWriter(directory,
> > new
> > >> > > > StandardAnalyzer(Version.LUCENE_CURRENT),
> > >> > > > IndexWriter.MaxFieldLength.UNLIMITED);
> > >> > > >             Document doc = new Document();
> > >> > > >             doc.add(new Field("title", "BBB CCC",
> > Field.Store.YES,
> > >> > > > Field.Index.NOT_ANALYZED));
> > >> > > >             writer.addDocument(doc);
> > >> > > >             doc = new Document();
> > >> > > >             doc.add(new Field("title", "ddd eee",
> > Field.Store.YES,
> > >> > > > Field.Index.NOT_ANALYZED));
> > >> > > >             writer.addDocument(doc);
> > >> > > >
> > >> > > >             writer.close();
> > >> > > >
> > >> > > >             IndexSearcher searcher = new
> > IndexSearcher(directory,
> > >> > > > true);
> > >> > > >             PerFieldAnalyzerWrapper wrapper = new
> > >> > > > PerFieldAnalyzerWrapper(new
> > StandardAnalyzer(Version.LUCENE_CURRENT));
> > >> > > >             wrapper.addAnalyzer("title", new
> > KeywordAnalyzer());
> > >> > > >             Query query = new QueryParser("title",
> > >> > > >                     wrapper).parse("title:BBB*");
> > >> > > >             System.out.println("hits of title = " +
> > >> > > > searcher.search(query, 100).totalHits);
> > >> > > >             query = new QueryParser("title",
> > >> > > >                     wrapper).parse("title:ddd*");
> > >> > > >             System.out.println("hits of title = " +
> > >> > > > searcher.search(query, 100).totalHits);
> > >> > > >             searcher.close();
> > >> > > >         } catch (Exception e) {
> > >> > > >             System.out.println(e);
> > >> > > >         }
> > >> > > >     }
> > >> > > > }
> > >> > > >
> > >> > > > The output:
> > >> > > > hits of title = 0
> > >> > > > hits of title = 1
> > >> > > >
> > >> > > >
> > >> > > >
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