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From "Allen Atamer" <ata...@sympatico.ca>
Subject RE: designing a dictionary filter with multiple word entries
Date Fri, 11 Apr 2008 16:40:17 GMT
Mathieu,
Your suggestion pointed me in the right direction. I was using a private
queue instead of using the inherited TokenStream from the superclass.
Thanks.

However that still didn't stop the PhraseQuery problem from happening. I
instead needed to add one more item into the code below

                newToken.setPositionIncrement(0);

by setting more than one term to the zero position increment, it forces a
BooleanQuery to be constructed within the MultiFieldQueryParser class,
instead of the PhraseQuery object.

Allen

-----Original Message-----
From: Mathieu Lecarme [mailto:mathieu@garambrogne.net] 
Sent: Wednesday, April 09, 2008 3:42 AM
To: java-user@lucene.apache.org
Subject: Re: designing a dictionary filter with multiple word entries

Allen Atamer a écrit :
> My dictionary filter currently implements next() and everything works well
> when dictionary entries are replaced one-to-one. For example:   Can =>
> Canada. 
>
> A problem arises when I try to replace it with more than one word. Going
> through next() I encounter "shutdown".  But the dictionary entry takes
> Shutdown => shut down (two words). I construct a replacement term
according
> the to the instructions in the Javadoc, but the search does not match any
> substrings "shut" or "down" in my database. I debugged it and found
> QueryParser is converting my replaced text into PhraseQuery objects
instead
> of BooleanQuery objects.
>
> My code to replace the string is below:
>
> 		Token teachToken = new Token();
> 		teachToken.resizeTermBuffer(replacementTerm.length());
> 		
> 		char [] termBuffer = teachToken.termBuffer();
> 		for (int i = 0; i < replacementTerm.length(); i++) {
> 			termBuffer[i] = replacementTerm.charAt(i);
> 		}
> 		teachToken.setTermLength(replacementTerm.length());
> 		this.tokenQueue.push(teachToken);
> 		return teachToken;
>
> Instead of [field1]:shut down, it is searching with [field1]:"shut down".
>
> How can I construct the replacement terms so that queries are formed
> properly, and I don't violate the next() contract?
>   
use a private stack. When you replace a word, fill it, and the next() 
will pop your stack. When the stack is empty, feed it again. So first 
time next() will get "shut", and second time "down".

M.


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