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From Anirudha Jadhav <aniru...@nyu.edu>
Subject surround parser not working for span queries
Date Thu, 29 Nov 2012 21:35:36 GMT
I was trying to port surround parer in 4.0 to 3.5

After getting the plugin to work I am not able to get the following results:

http://localhost:8983/solr/collection1/select?q=_query_:{!surround}features:(document3w
shiny)
this works on 4.0 but not on 3.5 with the plugin installed

3.5 query
http://localhost:8983/solr/select?q=_query_:{!surround}features:(document3w
shiny)

queries with and/or/not work correctly.

any suggestion as to what might be the problem ?

thanks,


code
-------------
import org.apache.lucene.queryParser.surround.query.SrndQuery;
import org.apache.lucene.queryParser.ParseException;//import
org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.search.Query;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.handler.SnapPuller;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.schema.IndexSchema;
import org.apache.lucene.queryParser.surround.parser.*;
import org.apache.lucene.queryParser.surround.query.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * porting solr 4.0 surround parser to 3.5
 */

public class SurroundQParserPlugin extends QParserPlugin {
  public static String NAME = "surround";

  @Override
  public void init(NamedList args) {
  }

  @Override
  public QParser createParser(String qstr, SolrParams localParams,
      SolrParams params, SolrQueryRequest req) {
    return new SurroundQParser(qstr, localParams, params, req);
  }

}

class SurroundQParser extends QParser {
  protected static final Logger LOG = LoggerFactory
.getLogger(SurroundQParser.class);
  static final int DEFMAXBASICQUERIES = 1000;
  static final String MBQParam = "maxBasicQueries";

  String sortStr;
  SolrQueryParser lparser;
  int maxBasicQueries;

  public SurroundQParser(String qstr, SolrParams localParams,
      SolrParams params, SolrQueryRequest req) {
    super(qstr, localParams, params, req);
  }

  @Override
  public Query parse()
      throws org.apache.lucene.queryParser.ParseException {
    SrndQuery sq;
    String qstr = getString();
    if (qstr == null)
      return null;
    String mbqparam = getParam(MBQParam);
    if (mbqparam == null) {
      this.maxBasicQueries = DEFMAXBASICQUERIES;
    } else {
      try {
        this.maxBasicQueries = Integer.parseInt(mbqparam);
      } catch (Exception e) {
        LOG.warn("Couldn't parse maxBasicQueries value " + mbqparam +",
using default of 1000");
        this.maxBasicQueries = DEFMAXBASICQUERIES;
      }
    }
    // ugh .. colliding ParseExceptions
    try {
      sq = org.apache.lucene.queryParser.surround.parser.QueryParser
          .parse(qstr);
    } catch (org.apache.lucene.queryParser.surround.parser.ParseException
pe) {
      throw new org.apache.lucene.queryParser.ParseException(
          pe.getMessage());
    }

    // so what do we do with the SrndQuery ??
    // processing based on example in LIA Ch 9

    BasicQueryFactory bqFactory = new
BasicQueryFactory(this.maxBasicQueries);
    String defaultField =
getDefaultField(getReq().getSchema(),getParam(CommonParams.DF));
    Query lquery = sq.makeLuceneQueryField(defaultField, bqFactory);
    return lquery;
  }


    public static String getDefaultField(final IndexSchema s, final String
df) {
        return df != null ? df : s.getDefaultSearchFieldName();
       }

}


-- 
Anirudha P. Jadhav

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