Package org.apache.lucene.monitor

Class Presearcher

java.lang.Object
org.apache.lucene.monitor.Presearcher
Direct Known Subclasses:
TermFilteredPresearcher
public abstract class Presearcher extends Object
A Presearcher is used by the Monitor to reduce the number of queries actually run against a Document. It defines how queries are stored in the monitor's internal index, and how a Document is converted to a query against that index.

  • Field Details

    • NO_FILTERING

      public static final Presearcher NO_FILTERING
      A Presearcher implementation that does no query filtering, and runs all registered queries

  • Constructor Details

    • Presearcher

      public Presearcher()

  • Method Details

    • buildQuery

      public abstract Query buildQuery(LeafReader reader, BiPredicate<String,BytesRef> termAcceptor)
      Build a query for a Monitor's queryindex from a LeafReader over a set of documents to monitor.
      Parameters:
      reader - a LeafReader over the input documents
      termAcceptor - a predicate indicating if a term should be added to the query
      Returns:
      a Query to run over a Monitor's queryindex

    • indexQuery

      public abstract Document indexQuery(Query query, Map<String,String> metadata)
      Build a lucene Document to index the query in a Monitor's queryindex
      Parameters:
      query - the Query to index
      metadata - a Map of arbitrary query metadata
      Returns:
      a lucene Document to add to the queryindex