try {
this.logger = aContext.getLogger();
// initialize stemmers
this.stemmers = new HashMap<String, SnowballProgram>();
this.stemmers.put("da", new danishStemmer());
this.stemmers.put("nl", new dutchStemmer());
this.stemmers.put("en", new englishStemmer());
this.stemmers.put("fi", new finnishStemmer());
this.stemmers.put("fr", new frenchStemmer());
this.stemmers.put("de", new germanStemmer());