org.terrier.structures
Class SingleLineTRECQuery

java.lang.Object
  org.terrier.structures.TRECQuery
      org.terrier.structures.SingleLineTRECQuery

All Implemented Interfaces:

Iterator<String>, TRECQuerying.QuerySource

public class SingleLineTRECQuery
extends TRECQuery

This class can be used to extract batch queries from a simpler format than the regular SGML TREC format. In particular, this class reads queries, one per line, verbatim from the specified file(s). Empty lines and lines starting with # are ignored. By default, queries are not tokenised by this class, and are passed verbatim to the query parser. Tokenisation can be turned on by the property SingleLineTRECQuery.tokenise, with the tokensier specified by tokeniser. Moreover, this class assumes that the first token on each line is the query Id. This can be controlled by the properties SingleLineTRECQuery.queryid.exists (default true). Trailing colons in the query Id are removed (aka TREC single line format from the Million Query track). Use this class by specifying trec.topics.parser=SingleLineTRECQuery and running TRECQuerying or TrecTerrier as normal.

Properties:

• SingleLineTRECQuery.queryid.exists - does the line start with a query Id? (defaults to true)
• SingleLineTRECQuery.tokenise (defaults to false). By default, the query is not passed through a tokeniser. If set to true, then it will be passed through the tokeniser configured by the tokeniser property.
• trec.encoding - expected encoding of topics file

Field Summary

Fields inherited from class org.terrier.structures.TRECQuery

desiredEncoding, IGNORE_DESC_NARR_NAME_TOKENS, index, logger, queries, query_ids, topicFiles

Constructor Summary

SingleLineTRECQuery()
Constructor - default

SingleLineTRECQuery(File queryfile)
Reads queries from the specified file

SingleLineTRECQuery(String queryfilename)
Reads queries from the specified filename

SingleLineTRECQuery(String[] queryfilenames)
Reads queries from the specified filenames

Method Summary

boolean

extractQuery(String queryfilename, Vector<String> vecStringQueries, Vector<String> vecStringIds) Extracts queries from the specified filename, adding their contents to vecStringQueries and the corresponding query ids to vecStringIds.

Methods inherited from class org.terrier.structures.TRECQuery

extractQuery, getIndexOfCurrentQuery, getInfo, getNumberOfQueries, getQuery, getQueryId, getQueryIds, getTopicFilenames, hasMoreQueries, hasNext, main, next, nextQuery, remove, reset, toArray

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SingleLineTRECQuery

public SingleLineTRECQuery()

Constructor - default

SingleLineTRECQuery

public SingleLineTRECQuery(File queryfile)

Reads queries from the specified file

SingleLineTRECQuery

public SingleLineTRECQuery(String queryfilename)

Reads queries from the specified filename

SingleLineTRECQuery

public SingleLineTRECQuery(String[] queryfilenames)

Reads queries from the specified filenames

Method Detail

extractQuery

public boolean extractQuery(String queryfilename,
                            Vector<String> vecStringQueries,
                            Vector<String> vecStringIds)

Extracts queries from the specified filename, adding their contents to vecStringQueries and the corresponding query ids to vecStringIds.

Overrides:

extractQuery in class TRECQuery

Parameters:

queryfilename - String the name of a file containing topics.

vecStringQueries - Vector a vector containing the queries as strings.

vecStringIds - Vector a vector containing the query identifiers as strings.

Returns:

true if some queries were successfully read