我需要做一个简单的搜索引擎,它可以识别和阻止罗马尼亚语单词,包括那些带有变音符号的单词。我使用的是RomanianAnalyzer,但是当涉及到有和没有变音符号的同一个单词时,它没有做正确的词干。
您能帮我一个添加/修改现有罗马尼亚词干分析器的代码吗?
PS:我编辑了这个问题,更清楚了。
答案 0 :(得分:2)
您可以复制RomanianAnalyzer
来源以创建自定义分析器,并在createComponents
方法中为分析链添加过滤器。 ASCIIFoldingFilter
可能就是你要找的东西。我会把它添加到最后,以确保你在删除变音符号时不会弄乱词干分析器。
public final class RomanianASCIIAnalyzer extends StopwordAnalyzerBase {
private final CharArraySet stemExclusionSet;
public final static String DEFAULT_STOPWORD_FILE = "stopwords.txt";
private static final String STOPWORDS_COMMENT = "#";
public static CharArraySet getDefaultStopSet(){
return DefaultSetHolder.DEFAULT_STOP_SET;
}
private static class DefaultSetHolder {
static final CharArraySet DEFAULT_STOP_SET;
static {
try {
DEFAULT_STOP_SET = loadStopwordSet(false, RomanianAnalyzer.class,
DEFAULT_STOPWORD_FILE, STOPWORDS_COMMENT);
} catch (IOException ex) {
throw new RuntimeException("Unable to load default stopword set");
}
}
}
public RomanianASCIIAnalyzer() {
this(DefaultSetHolder.DEFAULT_STOP_SET);
}
public RomanianASCIIAnalyzer(CharArraySet stopwords) {
this(stopwords, CharArraySet.EMPTY_SET);
}
public RomanianASCIIAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionSet) {
super(stopwords);
this.stemExclusionSet = CharArraySet.unmodifiableSet(CharArraySet.copy(stemExclusionSet));
}
@Override
protected TokenStreamComponents createComponents(String fieldName) {
final Tokenizer source = new StandardTokenizer();
TokenStream result = new StandardFilter(source);
result = new LowerCaseFilter(result);
result = new StopFilter(result, stopwords);
if(!stemExclusionSet.isEmpty())
result = new SetKeywordMarkerFilter(result, stemExclusionSet);
result = new SnowballFilter(result, new RomanianStemmer());
//This following line is the addition made to the RomanianAnalyzer source.
result = new ASCIIFoldingFilter(result);
return new TokenStreamComponents(source, result);
}
}