NAME

       Plucene::Analysis::PorterStemFilter - Porter stemming on the token stream

SYNOPSIS

               # isa Plucene::Analysis:::TokenFilter

               my $token = $porter_stem_filter->next;

DESCRIPTION

       This class transforms the token stream as per the Porter stemming algorithm.

       Note: the input to the stemming filter must already be in lower case, so you will need to
       use LowerCaseFilter or LowerCaseTokenizer farther down the Tokenizer chain in order for
       this to work properly!

       The Porter Stemmer implements Porter Algorithm for normalization of English words by
       stripping their extensions and is used to generalize the searches.  For example, the
       Porter algorithm maps both 'search' and 'searching' (as well as 'searchnessing') to
       'search' such that a query for 'search' will also match documents that contains the word
       'searching'.

       Note that the Porter algorithm is specific to the English language and may give
       unpredictable results for other languages. Also, make sure to use the same analyzer during
       the indexing and the searching.

       You can find more information on the Porter algorithm at
       www.tartarus.org/~martin/PorterStemmer.

       A nice online demonstration of the Porter algorithm is available at
       www.scs.carleton.ca/~dquesnel/java/stuff/PorterApplet.html.

METHODS

   next
               my $token = $porter_stem_filter->next;

       Returns the next input token, after being stemmed.