NAME

       Plucene::Index::Reader - Abstract class for accessing an index

DESCRIPTION

       IndexReader is an abstract class, providing an interface for accessing an index.  Search
       of an index is done entirely through this abstract interface, so that any subclass which
       implements it is searchable.

       Concrete subclasses of IndexReader are usually constructed with a call to the static
       method "open".

       For efficiency, in this API documents are often referred to via document numbers, non-
       negative integers which each name a unique document in the index.  These document numbers
       are ephemeral--they may change as documents are added to and deleted from an index.
       Clients should thus not rely on a given document having the same number between sessions.

METHODS

   new
               my $reader = Plucene::Index::Reader->new($dir_name);

       This will create a new Plucene::Index::Reader with the passed in directory.

   open
               # If there is only one segment
               my Plucene::Index::SegmentReader $seg_read = $reader->open;

               # If there are many segments
               my Plucene::Index::SegmentsReader $seg_read = $reader->open;

       Returns an IndexReader reading the index in the given Directory.

   last_modified
               my $last_modified = Plucene::Index::Reader->last_modified($directory);

   index_exists
               if (Plucene::Index::Reader->index_exists($directory)){ ... }

   is_locked
               if (Plucene::Index::Reader->is_locked($directory)){ ... }

   delete
               $reader->delete($doc);

   delete_term
               $reader->delete_term($term);

       This will delete all the documents which contain the passed term.

   close
               $reader->close;

   unlock
               $reader->unlock($directory);

   num_docs / max_doc / document / is_deleted / norms / terms / doc_freq / term_docs /
       term_positions / _do_delete / _do_close
       These must be defined in a subclass