java - Apache Lucene TokenStream契约(Contract)违规

使用Appache Lucene TokenStream删除停用词
导致错误:

TokenStream contract violation: reset()/close() call missing, reset() called multiple times, or subclass does not call super.reset(). Please see Javadocs of TokenStream class for more information about the correct consuming workflow.

我使用以下代码:

public static String removeStopWords(String string) throws IOException {
    TokenStream tokenStream = new StandardTokenizer(Version.LUCENE_47, new StringReader(string));
    TokenFilter tokenFilter = new StandardFilter(Version.LUCENE_47, tokenStream);
    TokenStream stopFilter = new StopFilter(Version.LUCENE_47, tokenFilter, StandardAnalyzer.STOP_WORDS_SET);
    StringBuilder stringBuilder = new StringBuilder();

    CharTermAttribute token = tokenStream.getAttribute(CharTermAttribute.class);

    while(stopFilter.incrementToken()) {
        if(stringBuilder.length() > 0 ) {
            stringBuilder.append(" ");
        }

        stringBuilder.append(token.toString());
    }

    stopFilter.end();
    stopFilter.close();

    return stringBuilder.toString();
}

但是如您所见，我从不调用reset()或close()。

那我为什么会收到这个错误？

最佳答案

好吧，那是你的问题。如果您想阅读TokenStream javadoc，则会发现以下内容:



我只需要在代码中添加一行reset()就可以了。

...
CharTermAttribute token = tokenStream.getAttribute(CharTermAttribute.class);
tokenStream.reset();   // I added this
while(stopFilter.incrementToken()) {
...