/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.analysis;
import java.util.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.snowball.SnowballFilter;
import org.tartarus.snowball.SnowballProgram;
/**
* Factory for SnowballFilters, with configurable language
*
* Browsing the code, SnowballFilter uses reflection to adapt to Lucene... don't
* use this if you are concerned about speed. Use EnglishPorterFilterFactory.
*
* @version $Id: SnowballPorterFilterFactory.java 689510 2008-08-27 16:02:46Z yonik $
*/
public class SnowballPorterFilterFactory extends BaseTokenFilterFactory {
private String language = "English";
private Class stemClass;
@Override
public void init(Map<String, String> args) {
super.init(args);
final String cfgLanguage = args.get("language");
if(cfgLanguage!=null) language = cfgLanguage;
try {
stemClass = Class.forName("org.tartarus.snowball.ext." + language + "Stemmer");
} catch (ClassNotFoundException e) {
throw new RuntimeException("Can't find class for stemmer language " + language, e);
}
}
public SnowballFilter create(TokenStream input) {
SnowballProgram program;
try {
program = (SnowballProgram)stemClass.newInstance();
} catch (Exception e) {
throw new RuntimeException("Error instantiating stemmer for language " + language + "from class " +stemClass, e);
}
return new SnowballFilter(input, program);
}
}