Question

I’ve written a QueryParser that is looks a little like Lucene’s QueryParser. I’ve written a simple QParser and a QParserPlugin with which I can use my QueryParser.

One question that remains is: Where do I get a reference to the Analyzer configured in the Solr schema? Or how can I inject it to use the Analyzer into my query parser’s constructor?

Answer 1

Here is my (simplified) solution in Java for using the configured Analyzer (and default field) from the schema file in MyQueryParser.

public class MyParserPlugin extends QParserPlugin {
    @Override
    public QParser createParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) {
        return new MyQParser(qstr, localParams, params, req);
    }
}

class MyQParser extends QParser {
    public MyQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) {
        super(qstr, localParams, params, req);
    }

    @Override
    public Query parse() throws ParseException {
        // Getting info from the schema
        String field = this.getReq().getSchema().getDefaultSearchFieldName();
        Analyzer analyzer = this.getReq().getSchema().getQueryAnalyzer();

        // Here we go
        MyQueryParser parser = new MyQueryParser(Version.LUCENE_36, field, analyzer);
        return parser.parse(this.qstr);
    }
}