Creating an alias for a field name?

[Jan Peter Stotz <jp...@gmx.de>]

Hi,

I would like to provide multiple field-names that are all mapped to the 
same field in background (e.g. a long field-name and a short 
field-name). Is there any mechanism for creating such field-aliases, may 
be in the IndexWriter or an QueryParser?

Jan

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Re: Creating an alias for a field name?

[Jan Peter Stotz <jp...@gmx.de>]

Hi Erick,

thanks for your response.

> Not that I know of. I presume that you want this to reduct typing
> or some such. Your app could simply massage the query
> that was typed, doing the appropriate substitutions before
> parsing the query....

Well I found a much better solution which avoids "double parsing". I 
created my own QueryParser by extending the existing. Then I identified 
five methods to override:

getFieldQuery(String field,String queryText)
getFuzzyQuery(String field,String termStr, float minSimilarity)
getPrefixQuery(String field,String termStr)
getRangeQuery(String field,String part1, String part2, boolean inclusive)
getWildcardQuery(String field,String termStr)

In each of this methods I call my own method:
field = translateField(field);
before passing the values to it's super implementation.

And my translateField method uses a Hashtable for looking up field 
aliases. It it finds an alias it returns it, otherwise the field is 
returned without modification. Therefore I have my field aliases without 
having to implement an own parser - thanks to the good OO-design of the 
QueryParser class.

BTW: If someone wants to took onto the complete source just ask. I did 
not want to attach/include them because of its size (most of the code 
has been generated by Eclipse...)

Jan

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Re: Creating an alias for a field name?

[Erick Erickson <er...@gmail.com>]

Not that I know of. I presume that you want this to reduct typing
or some such. Your app could simply massage the query
that was typed, doing the appropriate substitutions before
parsing the query....

Erick

On Jan 19, 2008 6:52 AM, Jan Peter Stotz <jp...@gmx.de> wrote:

> Hi,
>
> I would like to provide multiple field-names that are all mapped to the
> same field in background (e.g. a long field-name and a short
> field-name). Is there any mechanism for creating such field-aliases, may
> be in the IndexWriter or an QueryParser?
>
> Jan
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>