从 Lucene 查询中获取匹配的术语 [英] Get matched terms from Lucene query

问题描述

给定一个 Lucene 搜索查询，例如:+(letter:A letter:B letter:C) +(style:Capital)，我如何判断三个字母中的哪一个实际上与任何给定文档匹配?我不在乎它们在哪里匹配，或者它们匹配了多少次，我只需要知道它们是否匹配.

Given a Lucene search query like: +(letter:A letter:B letter:C) +(style:Capital), how can I tell which of the three letters actually matched any given document? I don't care where they match, or how many times they match, I just need to know whether they matched.

目的是获取初始查询(A B C")，删除成功匹配的术语(A和B)，然后对剩余的(C)进行进一步处理.

The intent is to take the initial query ("A B C"), remove the terms which successfully matched (A and B), and then do further processing on the remainder (C).

推荐答案

虽然示例是用 c# 编写的，但 Lucene API 非常相似(一些大小写不同).我认为翻译成java并不难.

Although the sample is in c#, Lucene APIs are very similar(some upper/lower case differences). I don't think it would be hard to translate to java.

这是用法

List<Term> terms = new List<Term>();    //will be filled with non-matched terms
List<Term> hitTerms = new List<Term>(); //will be filled with matched terms
GetHitTerms(query, searcher,docId, hitTerms,terms);

这是方法

void GetHitTerms(Query query,IndexSearcher searcher,int docId,List<Term> hitTerms,List<Term>rest)
{
    if (query is TermQuery)
    {
        if (searcher.Explain(query, docId).IsMatch() == true) 
            hitTerms.Add((query as TermQuery).GetTerm());
        else
            rest.Add((query as TermQuery).GetTerm());
        return;
    }

    if (query is BooleanQuery)
    {
        BooleanClause[] clauses = (query as BooleanQuery).GetClauses();
        if (clauses == null) return;

        foreach (BooleanClause bc in clauses)
        {
            GetHitTerms(bc.GetQuery(), searcher, docId,hitTerms,rest);
        }
        return;
    }

    if (query is MultiTermQuery)
    {
        if (!(query is FuzzyQuery)) //FuzzQuery doesn't support SetRewriteMethod
            (query as MultiTermQuery).SetRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);

        GetHitTerms(query.Rewrite(searcher.GetIndexReader()), searcher, docId,hitTerms,rest);
    }
}

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