NAME

       Lucy::Search::Searcher - Base class for searching collections of documents.

SYNOPSIS

           # Abstract base class.

DESCRIPTION

       Abstract base class for objects which search.  Core subclasses include
       Lucy::Search::IndexSearcher and Lucy::Search::PolySearcher.

CONSTRUCTORS

   new( [labeled params] )
           package MySearcher;
           use base qw( Lucy::Search::Searcher );
           sub new {
               my $self = shift->SUPER::new;
               ...
               return $self;
           }

       Abstract constructor.

       •   schema - A Schema.

ABSTRACT METHODS

   collect( [labeled params] )
       Iterate over hits, feeding them into a Collector.

       •   query - A Query.

       •   collector - A Collector.

   doc_max()
       Return the maximum number of docs in the collection represented by the Searcher, which is
       also the highest possible internal doc id.  Documents which have been marked as deleted
       but not yet purged are included in this count.

   doc_freq( [labeled params] )
       Return the number of documents which contain the term in the given field.

       •   field - Field name.

       •   term - The term to look up.

   fetch_doc(doc_id)
       Retrieve a document.  Throws an error if the doc id is out of range.

       •   doc_id - A document id.

METHODS

   hits( [labeled params] )
       Return a Hits object containing the top results.

       •   query - Either a Query object or a query string.

       •   offset - The number of most-relevant hits to discard, typically used when "paging"
           through hits N at a time.  Setting "offset" to 20 and "num_wanted" to 10 retrieves
           hits 21-30, assuming that 30 hits can be found.

       •   num_wanted - The number of hits you would like to see after "offset" is taken into
           account.

       •   sort_spec - A Lucy::Search::SortSpec, which will affect how results are ranked and
           returned.

   glean_query(query)
       If the supplied object is a Query, return it; if it's a query string, create a QueryParser
       and parse it to produce a query against all indexed fields.

   get_schema()
       Accessor for the object's "schema" member.

INHERITANCE

       Lucy::Search::Searcher isa Lucy::Object::Obj.