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| {@link org.apache.lucene.analysis.TokenFilter} and {@link |
| org.apache.lucene.analysis.Analyzer} implementations that use Snowball |
| stemmers. |
| <p> |
| This project provides pre-compiled version of the Snowball stemmers |
| based on revision 500 of the Tartarus Snowball repository, |
| together with classes integrating them with the Lucene search engine. |
| </p> |
| <p> |
| A few changes has been made to the static Snowball code and compiled stemmers: |
| </p> |
| <ul> |
| <li>Class SnowballProgram is made abstract and contains new abstract method stem() to avoid reflection in Lucene filter class SnowballFilter.</li> |
| <li>All use of StringBuffers has been refactored to StringBuilder for speed.</li> |
| <li>Snowball BSD license header has been added to the Java classes to avoid having RAT adding ASL headers.</li> |
| </ul> |
| <p> |
| See the Snowball <a href ="http://snowball.tartarus.org/">home page</a> for more information about the algorithms. |
| </p> |
| |
| <p> |
| <b>IMPORTANT NOTICE ON BACKWARDS COMPATIBILITY!</b> |
| </p> |
| <p> |
| An index created using the Snowball module in Lucene 2.3.2 and below |
| might not be compatible with the Snowball module in Lucene 2.4 or greater. |
| </p> |
| <p> |
| For more information about this issue see: |
| https://issues.apache.org/jira/browse/LUCENE-1142 |
| </p> |
| |
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