java - Lucene 查询范围

Question

我正在为一些包含 title 和 cost 作为字段的项目建立索引。成本是双重值(value)。 我正在准备一个查询，例如:

(title:item~0.8) AND (cost:[0.0 TO 200.0])

解析后，query.toString()看起来像这样:

+title:item~0 +cost:[0.0 TO 200.0]

从返回的结果来看，显然没有考虑成本。 我确信 cost 已被索引，因为我可以检索它。 索引代码:

public void index(Set<Item> items) throws IOException {
    String path = "D:\\lucenedata\\myproj";
    Directory fsDir = FSDirectory.open(new File(path));
    StandardAnalyzer analyzer = new StandardAnalyzer();
    IndexWriterConfig iwConf = new IndexWriterConfig(Version.LUCENE_4_10_3, analyzer);
    iwConf.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
    IndexWriter indexWriter = new IndexWriter(fsDir, iwConf);
    for (Item item : items) {
        Document d = new Document();
        if (item.getCost() != null) {
            d.add(new DoubleField("cost", item.getCost().doubleValue(), Store.YES));
        }
        d.add(new TextField("title", item.getTitle(), Store.YES));
        indexWriter.addDocument(d);
    }
    indexWriter.commit();
    indexWriter.close();
    System.out.println("Indexed " + items.size() + " items");
}

Answer 1

我最终对QueryParser进行子类化，然后在遇到cost时创建一个NumericRange。效果很好。

public class WebSearchQueryParser extends QueryParser {

    public WebSearchQueryParser(String f, Analyzer a) {
        super(f, a);
    }

    protected Query getRangeQuery(final String field, final String min, final String max,
            final boolean startInclusive, final boolean endInclusive) throws ParseException {
        if ("cost".equals(field)) {
            return NumericRangeQuery.newDoubleRange(field, Double.parseDouble(min), Double.parseDouble(max),
                    startInclusive, endInclusive);
        }
        return super.getRangeQuery(field, min, max, startInclusive, endInclusive);
    }
}

然后初始化:

QueryParser queryParser = new WebSearchQueryParser("title", new StandardAnalyzer());

并像以前一样解析我的查询(title:item~0.8) AND (cost:[0.0 TO 200.0])