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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-301) Index Writer constructor flags unclear - and annoying in certain cases
Date Fri, 17 Feb 2006 19:11:24 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-301?page=comments#action_12366834 ] 

Hoss Man commented on LUCENE-301:
---------------------------------


>The only change (and I consider it an improvment, and unlikely to break anyones
>code) is that if it is set to false, and no index exists yet, then it will
>create a new empty index at the specified location.

...that could be very bad for tools/apps that wantto update an existing index after reading
the directory path from user input or configs when the user makes a typo.  In the past "new
IndexWriter(d,a,false) would throw an Exception indicating a problem, with the change you
describe it would happily make a new index.


I'd be happy to see a more explict API with more options about what you want IndexWRiter to
do if/when the directory does'doesn't exist ... but it should be 100% backwards compatible.
 deprecating this constructor but leaving it alone and adding a new one with more options
seems like a much safer approach.

> Index Writer constructor flags unclear - and annoying in certain cases
> ----------------------------------------------------------------------
>
>          Key: LUCENE-301
>          URL: http://issues.apache.org/jira/browse/LUCENE-301
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Index
>     Versions: 1.4
>  Environment: Operating System: other
> Platform: Other
>     Reporter: Dan Armbrust
>     Assignee: Lucene Developers
>     Priority: Minor

>
> Wouldn't it make more sense if the constructor for the IndexWriter always
> created an index if it doesn't exist - and the boolean parameter should be
> "clear" (instead of "create")
> So instead of this (from javadoc):
> IndexWriter
> public IndexWriter(Directory d,
>                    Analyzer a,
>                    boolean create)
>             throws IOException
>     Constructs an IndexWriter for the index in d. Text will be analyzed with a.
> If create is true, then a new, empty index will be created in d, replacing the
> index already there, if any.
> Parameters:
>     d - the index directory
>     a - the analyzer to use
>     create - true to create the index or overwrite the existing one; false to
> append to the existing index 
> Throws:
>     IOException - if the directory cannot be read/written to, or if it does not
> exist, and create is false
> We would have this:
> IndexWriter
> public IndexWriter(Directory d,
>                    Analyzer a,
>                    boolean clear)
>             throws IOException
>     Constructs an IndexWriter for the index in d. Text will be analyzed with a.
> If clear is true, and a index exists at location d, then it will be erased, and
> a new, empty index will be created in d.
> Parameters:
>     d - the index directory
>     a - the analyzer to use
>     clear - true to overwrite the existing one; false to append to the existing
> index 
> Throws:
>     IOException - if the directory cannot be read/written to, or if it does not
> exist.
> Its current behavior is kind of annoying, because I have an app that should
> never clear an existing index, it should always append.  So I want create set to
> false.  But when I am starting a brand new index, then I have to change the
> create flag to keep it from throwing an exception...  I guess for now I will
> have to write code to check if a index actually has content yet, and if it
> doesn't, change the flag on the fly.

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